SPIRENT GSS7000 DATASHEET

DATASHEET

GSS7000 Series GNSS
Constellation Simulator

Delivering reliable results faster

Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Purpose of this Document

This datasheet describes the functionality of the Spirent GSS7000 Series Multi-Frequency, Multi-GNSS RF Constellation
Simulators, which sets a new standard of excellence in GNSS RF Simulation for performance testing and evaluation of GNSS
systems and devices for civil and consumer applications.

This datasheet also provides technical product specification data and configuration information and is to be used as the
basis of a formal quotation or acceptance of a purchase order. Spirent reserves the right to change this specification at
any time.

Please speak to your Spirent sales representative to discuss your requirements.

PROPRIETARY INFORMATION

THE INFORMATION CONTAINED IN THIS DOCUMENT IS THE PROPERTY OF SPIRENT COMMUNICATIONS PLC. EXCEPT AS
SPECIFICALLY AUTHORISED IN WRITING BY SPIRENT COMMUNICATIONS PLC, THE HOLDER OF THIS DOCUMENT SHALL KEEP ALL
INFORMATION CONTAINED HEREIN CONFIDENTIAL AND SHALL PROTECT SAME IN WHOLE OR IN PART FROM DISCLOSURE AND
DISSEMINATION TO ALL THIRD PARTIES TO THE SAME DEGREE IT PROTECTS ITS OWN CONFIDENTIAL INFORMATION.

© COPYRIGHT SPIRENT COMMUNICATIONS PLC 2013 - 2021

The ownership of all other registered trademarks used in this document is duly acknowledged.

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Table of Contents

Purpose of this Document ............................................................................................................................................ 2

Table of Contents ......................................................................................................................................................... 3

List of Tables ................................................................................................................................................................. 4

List of Figures ............................................................................................................................................................... 4

Introduction ................................................................................................................................................................... 5

GNSS Testing Using the Right Methods .................................................................................................................. 5

SimGEN™ SimREPLAYplus™ and SimTEST™ Operating Software ......................................................................... 6

SimGEN™ ................................................................................................................................................................ 6

SimREPLAYplus™ ................................................................................................................................................... 8

SimTEST™ ............................................................................................................................................................... 9

Single Channel Utility (SCU) .................................................................................................................................. 11

Before a run ....................................................................................................................................................... 12

Starting a run ..................................................................................................................................................... 12

During a run ....................................................................................................................................................... 12

After a run .......................................................................................................................................................... 12

Miscellaneous commands ................................................................................................................................. 12

Extensions and Options ......................................................................................................................................... 13

Compatibility with Other Spirent Simulator Hardware ............................................................................................ 14

GSS7000 System Overview ....................................................................................................................................... 15

GSS7000 Signal Generation Flexibility and Capability Overview .......................................................................... 15

GNSS Constellations .................................................................................................................................................. 16

Flexible Channel Allocation ........................................................................................................................................ 17

Example GSS7000 Systems ...................................................................................................................................... 18

Upgrades .................................................................................................................................................................... 19

Performance Specifications ........................................................................................................................................ 20

GNSS Constellations and Supported Ranging Signals ......................................................................................... 20

Nominal Signal Levels ............................................................................................................................................ 21

Calibration Requirements ........................................................................................................................................... 27

Related Brochures, Data Sheets and Specifications .................................................................................................. 28

ICD Compliance – Applicable Documents .................................................................................................................. 29

Glossary of Terms....................................................................................................................................................... 30

Referenced Documents .............................................................................................................................................. 31

For More Information .................................................................................................................................................. 32

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

List of Tables

Table 1 Support of extension and optional products .................................................................................................. 13

Table 2 Summary of supported, default and licensable options ................................................................................. 14

Table 3 Single and Dual-RF GSS7000 Software Compatibility .................................................................................. 15

Table 4 Channel Band Allocations.............................................................................................................................. 16

Table 5 Supported constellations for each channel bank ........................................................................................... 16

Table 6 GNSS constellations and ranging signals ..................................................................................................... 20

Table 7 Nominal Signal Levels ................................................................................................................................... 21

Table 8 Navigation Messages Types per Constellation (standard and optional signals) ........................................... 22

Table 9 Performance Levels for GSS7000 Series ...................................................................................................... 23

Table 10 Embedded interference signal specifications .............................................................................................. 24

Table 11 Embedded interference signal modulation types and performance ............................................................ 24

Table 12 Signal Generator Connectivity ..................................................................................................................... 25

Table 13 Internal Controller Connectivity ................................................................................................................... 25

Table 14 Optional monitor .......................................................................................................................................... 25

Table 15 Physical and Environmental Properties ....................................................................................................... 26

Table 16 Safety and EMC Compliance ...................................................................................................................... 26

Table 17 Related Product References ...................................................................................................................... 28

Table 18 ICD compliance, .......................................................................................................................................... 29

List of Figures

Figure 1 Spirent scenario definition and simulation control software (SimGEN™ shown) ........................................... 6

Figure 2 SimREPLAYplus main screen ........................................................................................................................ 8

Figure 3 SimTEST main screen .................................................................................................................................... 9

Figure 4 SimROUTE™ Google Maps® User Motion Trajectory generation tool linked to SimTEST™ ....................... 9

Figure 5 Single Channel Utility main screen ............................................................................................................... 11

Figure 6 GSS7000 system (Single and dual RF) ....................................................................................................... 15

Figure 7 Dynamic channel allocation control concept ................................................................................................ 17

Figure 8 Dual-frequency, 2-constellation system Figure 9 Dual-frequency, 3-constellation system .................... 18

Figure 10 Triple-frequency, 3-constellation system Figure 11 Dual-freq, 2-constellation 2RF system ................ 18

Figure 12 Dual-freq, GNSS + interference 2RF system ............................................................................................. 18

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Introduction

The Spirent GSS7000 Series Multi-Frequency, Multi-GNSS RF Constellation Simulator sets a new standard of excellence in
GNSS RF Simulation for performance testing and evaluation of GNSS systems and devices for civil and consumer applications.

The GSS7000 produces a comprehensive range of emulated multi-GNSS, multi-frequency RF signals with class-leading flexibility,
coherence, fidelity, performance, accuracy and reliability.

The GSS7000 provides numerous benefits to all those working in GNSS/system technology and application development,
including accurate and properly-defined signals, comprehensive and feature-rich simulation and full control of all aspects of the
GNSS operating environment, inherent repeatability and the ability to apply systematic errors and incidents that are impossible to
realise using real satellite signals.

Application of Spirent’s expertise in producing GNSS Test Solutions acquired over the past 30 years, plus advancements in the
performance and efficiency of the state-of-the-art core technology on which the GSS7000 is built, means that properly-defined
GNSS testing is now more accessible than ever, at the entry-level for fundamental testing, and right through the series to the most
capable configuration for advanced testing.

These benefits, together with Spirent’s proven global expertise and support make the Spirent GSS7000 Multi-Frequency, Multi­GNSS RF Constellation Simulator the essential choice for all civil and consumer device application test needs.

GNSS Testing Using the Right Methods

Regardless of the application for GNSS devices, testing using proper methods is essential. The GSS7000 supports an extensive
range of constellation configurations, which support authentic testing of devices using any of the existing and planned open­service/civil-use Satellite Navigation signals.

GSS7000 key attributes:

• The use of correct and accurate techniques/models to derive satellite constellation and navigation data parameters

commensurate with the applicable ICDs

• Dual-RF Option (Available with SimGEN and SimREPLAYplus)

• Single Channel Utility for Single Channel Multi-Frequency Simulation

• True1 performance in several key areas such as:

– 100 Hz System Iteration Rate (SIR) and Hardware Update Rate (HUR)

– 3mm Pseudorange Accuracy

– Zero Pseudorange Bias

– <0.02 Rad RMS Phase Noise

• Up to 256 channels in one chassis

• Highly flexible configurations selectable via feature licence keys

• Three operating software options to cover all levels of test

• Complete portability of Spirent SimGEN™ scenarios from other Spirent systems

• In-field upgradeability of principal GNSS functionality and capability

• On-the-fly, run-to-run re-configuration of constellation and signal configurations

• All GNSS constellation types and all frequencies within a single chassis

• Fully future-proofed for all advances in GNSS systems, signals, modulations, codes and data

• Integrated interference generation and spoofing test solution

In view of the wide range of possible permutations, Spirent recommends that you discuss your current and future needs with your
local sales representative. Spirent will provide specific configuration and pricing information to meet your needs.

1 True Performance means the simulator specification is met for ALL dynamic conditions as specified. Many ‘GNSS simulators’ stop working

properly when (even relatively benign) receiver motion is applied because they employ generic hardware.

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

SimGEN™, SimREPLAYplus™ and SimTEST™ Operating Software

The GSS7000 can be operated using any of the three software options from the Spirent “Sim” family, allowing ultimate choice in
the capability and complexity of testing.

SimGEN™ is the world’s leading GNSS simulation software for test scenario definition, execution, data management and

GNSS RF constellation simulator command and control. With the fullest capability, features and performance continuously
developed in close consultation with GNSS system authorities over the last 30 years, SimGEN™ supports all the GNSS test
parameters and control capabilities needed for comprehensive GNSS testing for research, development and design of GNSS
systems, services and devices across any application.

Figure 1 Spirent scenario definition and simulation control software (SimGEN™ shown)

Key SimGEN™ fundamental performance and modelling capabilities:

• Fully automatic and propagated generation of precise satellite orbital data, ephemerides and almanac

• Multiplicity of mechanisms for applying declared and undeclared errors and modifications to navigation data, Satellite

clocks and orbits

• SimREMOTE: Comprehensive remote simulation control and 6-DOF trajectory delivery capability

• Generation of trajectories based on extensive Google® Mapping data

• Data logging and streaming of signal, time, control, vehicle and trajectory data over a variety of interfaces in real-time

and to file

• Range of models for Multipath reflections

• Terrain obscuration models

• Independent satellite/channel signal power control

• Signal modulation and code control

• Vehicle personalities and motion modelling for aircraft, spacecraft, marine vessels and land vehicles

• Vehicle antenna reception gain and phase patterns

• Satellite transmit antenna pattern control

• Clock G-sensitivity

• INS aiding data

• Ionosphere and Troposphere effects including ionospheric scintillation

• DGPS corrections

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• Pseudorange ramps (for RAIM testing)

• Coherent and non-coherent Interference and noise modelling (optional GSS7765 Interference Generator)

• Leap-second and week roll-over event testing

• RTCM data streaming and in-built NTRIP Server interface

• Trajectory spoofing testing

For more information, please refer to the SimGEN User Manual, Reference a)

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

SimREPLAYplus™ is designed to allow the replay of pre-defined test scenarios whilst providing a range of tools and

capabilities to enhance usability before, during and after testing. A powerful feature of SimREPLAYplus™ is the ability to replay
complex scenarios which have been created on other Spirent SimGEN™- controlled systems. Depending on the hardware and
constellation licences installed, the full complexity of the SimGEN™ scenario is faithfully replayed in SimREPLAYplus™ but
without the detailed scenario editing and modification capability. This is ideal for controlled test planning where a central R&D lab
can issue version-controlled test scenarios out to other teams, knowing the detailed test parameters cannot be altered by mistake.

Figure 2 SimREPLAYplus main screen

Key SimREPLAYplus™ features:

• Interactive run time control

• Share scenarios between systems to facilitate collaboration

• Save and compare device under test data with logged simulation data

• Receiver antenna pattern modelling

• Environment terrain modelling

• Edit and save time, date and location

• Use motion from logged NMEA and Google Maps® matched trajectories via the SimROUTE™ tool

• Flexibly allocate available hardware channels across licenced constellations

• Display simulation parameters

• Display sky plot

• Selected remote control capability via Ethernet connection

• Bulk logging of scenario data

• NMEA input and Output

• Licensable RTCM and NTRIP capability

• Trajectory spoofing testing

For more information, please refer to the SimREPLAYplus for GSS6700 and GSS7000 User Manual, reference b)

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SimTEST™ is for essential testing. It provides the capability needed to perform fundamental verification tests. Spirent’s

complex and precise modelling of constellations and navigation data is built-in providing maximum ease of use to the user. Simply
set up a few key parameters and press ‘run’.

Figure 3 SimTEST main screen

Figure 4 SimROUTE™ Google Maps® User Motion Trajectory generation tool linked to

SimTEST™

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Key SimTEST™ features include:

• Edit and save time and date

• Enable/disable atmospheric modelling

• Enable/disable multipath

• Interactive power control of each individual constellation

• Load real constellation almanacs

• Choose Static position, simple motion, ‘racetrack motion’ or Google Maps® matched trajectories via the SimROUTE™

tool

• Enable and disable RX Antenna Level Patterns

• Simulate leap second events

• Flexibly allocate available hardware channels across licenced constellations

• Display simulation parameters

• Display sky plot

• Selected remote control capability via Ethernet connection

For more information, please refer to the SimTEST Software User Manual Reference c)

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Single Channel Utility (SCU)

The GSS7000 supports the generation of a single channel satellite signal for each licenced constellation. This allows individual
control of several parameters via remote commands including: A satellite’s carrier frequency, power level, velocity profile and
PRN, secondary code and navigation data. Under Single Channel mode, GSS7000 can be controlled via GUI or remote
commands. Commands are formatted according to Spirent’s SimREMOTE™ ICD and are sent via TCP/IP

Figure 5 Single Channel Utility main screen

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Commands can be grouped into the following 5 sets:

Before a run

Command Description

SET_ANT_FREQS Enable constellation frequencies

SET_DIR_INIT_PR Set the initial pseudorange

SET_DIR_SV Set the signal SVID and PRN

SET_EXT_REF Set the external reference frequency

START_TIME Set the simulation start time and duration

TR Set the trigger mode

Starting a run

Command Description

AR Arm the simulation

AR_NOWAIT Arm the simulation, response returned immediately

GET_EXT_REF Return the status of any time reference signal

RU Run the simulation

RU_NOWAIT Run the simulation, response returned immediately

During a run

Command Description

EN End a running scenario

POW_LEV_SCU Set the power level of a satellite signal

SET_DIR_PROFILE Set signal velocity profile

SET_DIR_VEL Set signal velocity and doppler

SET_MODS Set PRN, BeiDou secondary code and navigation data on/off

SET_PARITY_ERR Turn navigation data parity errors on and off

TIME Get the time into run

After a run

Command Description

RW Rewind a simulation that has ended

Miscellaneous commands

Command Description

EXIT_SIMGEN Terminate the PosApp Engine

GET_ANT_FREQS Return the enabled constellation frequencies

*IDN? Return the software version

LOG_DIR Return the log file folder

MSG_REPORTING_FILE_NAME Return the message log file name

NULL Return the status information

STTIME Return the simulation start time

For more information, refer to the Single Channel Utility User Manual Reference (d)

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Extensions and Options

With the appropriate licences; extensions and options are available with the GSS7000 to facilitate development and testing of
systems and applications which use other signals for navigation, including;

• MEMS INS sensor output data modelling with SimSENSOR™

• In-Vehicle Navigation System (IVNS) testing with SimAUTO™

• Embedded in-band interference signal generation (see Table 10-11 ).

Table 1 shows the support for extension and optional products with GSS7000.

Table 1 Support of extension and optional products

Product Support @ SimTEST

SimINERTIAL NO NO NO

SimAUTO NO YES YES

SimSENSOR NO YES YES

SimSAFE NO NO YES

Sim3D YES YES YES

SimHIL YES YES YES

GSS7765 NO YES YES

SimROUTE Embedded Embedded Embedded

Embedded interference
generation

Classified options NO NO NO

GBAS Simulation NO NO YES

ScramNET I/O NO NO NO

Licenced Licenced Licenced

Support @
SimREPLAYplus

Support @ SimGEN

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Table 2 shows a summary of default and licenced options across the three software levels for the GSS7000

Table 2 Summary of supported, default and licensable options

Product

Fixed Offset Multipath By default By default By default

Standalone SBAS and all QZSS Licenced Licenced Licenced

Land Mobile Multipath X By default By default

GPS P Code (inc Pseudo Y) Licenced Licenced By default

GLONASS P Code Licenced Licenced By default

GPS L1C By default By default By default

GPS L2C By default By default By default

BeiDou B1I, B1C, B2I, B2a, B2b, B3I Licenced Licenced Licenced

NavIC (IRNSS) L5 Licenced Licenced Licenced

SimAUTO X Licenced Licenced

GSS7000 Channel Usage By default By default By default

GSS7765 X Licenced Licenced

SimROUTE By default By default By default

REPLAY of SimGEN scenarios X By default By default

GBAS via the GSS4150 X X Licenced

Support @

SimTEST

Support @ SimREPLAYplus Support @ SimGEN

Compatibility with Other Spirent Simulator Hardware

Note the GSS7000 is a standalone system. It is not possible to connect the GSS7000 to other GNSS Simulator hardware
platforms in a system controlled by a common test scenario. Note this does not apply to ancillary options such as SimAUTO
and GSS4150 GBAS simulator.

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GSS7000 System Overview

The GSS7000 consists of a single bench-top unit with internal controller running the appropriate operating software. Peripherals
(monitor, keyboard and mouse), are optional and can be supplied.

Figure 6 GSS7000 system (Single and dual RF)

GSS7000 Signal Generation Flexibility and Capability Overview

• A single GSS7000 chassis can support a maximum of 4 generic channel banks (a channel bank consists of a digital

signal generator and RF upconverter). The signals from all banks are combined and fed simultaneously to the front­panel primary RF output and rear-panel high-level output.

• Each channel bank can be configured to generate up to 64 channels of any signal type within one of four frequency

bands. Multiple constellations can be generated from a single channel bank simultaneously, providing they are all from
the same frequency band. Refer to Table 4 for details of signal type groupings.

• The total number of channels in any one chassis is 256.

• The configuration of constellation/frequency is fixed for the duration of the simulation run.

• The constellations/frequencies available to the user are dependent upon the licences that are installed.

• The GSS7000 supports the opportunity for in-field RF channel bank hardware upgrade.

• The GSS7000 supports a 100Hz SIR.

• The GSS7000 supports backwards compatibility with Spirent SimREPLAYplus™ and SimGEN™ scenarios.

• The GSS7000 is available as a single or dual-RF chassis. Table 3 provides details of software support.

Table 3 Single and Dual-RF GSS7000 Software Compatibility

Product variant Support @ SimTEST

Support @
SimREPLAYplus

Support @ SimGEN

GSS7000 Single-RF YES YES YES

GSS7000 Dual-RF NO YES YES

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

BeiDou-2

B1I

Spirent GSS7000 Series GNSS Constellation Simulator

Table 4 Channel Band Allocations

Carrier Freq (MHz) Band

1176.45 1

1191.795 1

1202.025 2

1207.14 2

1227.6 2

1245.781 2

1268.52 3

1278.75 3

1561.098 4

1575.42 4

1575.42 4

1601.719 4

Table 5 Supported constellations for each channel bank

Constellation Frequency

GPS/SBAS L1

GPS L2

GPS/SBAS L5

Galileo E1

Galileo E5

Galileo E6

GLONASS L1

GLONASS L2

BeiDou-2 B2I

BeiDou B1C B1C

BeiDou B2a B2a

BeiDou B2b B2b

Beidou B3I B3I

SBAS (note 1) L1

SBAS (note 1) L5

QZSS L1

QZSS L2

QZSS L5

QZSS L6

NavIC/(IRNSS) L5

GNSS Constellations

The GSS7000 architecture supports GNSS signal generation capability in a very flexible way. With the appropriate constellation
feature licence keys, each generic RF Channel Bank can support – at any one time – any number of constellation types within
the same band - as shown in Table 5. (Note: for current ICD compliance, see Table 18).

The combinations of constellations generated can vary from scenario to scenario and even between successive runs of the same
scenario, depending on the settings in the control software. The principle is that at a particular instant in time, signals from any
constellation can be generated provided there is a valid feature licence key and an available RF Channel Bank with the requisite
number of licenced channels in the system.

Notes for Table 5

• SBAS (WAAS, EGNOS, MSAS) will be provided with any purchase of GPS L1 or L5, respectively. GPS satellite signals

are substituted for SBAS ones as required. For non-GPS systems, it is possible to order SBAS as a separate signal.

• The GSS7000 is technology-ready for support of other future GNSS systems/signals, some of which can be supported

today through Spirent’s Tailored Solutions. Others are planned on the product roadmap.

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Flexible Channel Allocation

A useful feature of the GSS7000 is the flexible way licenced satellite channels can be assigned to constellations.

For example:

• Consider a L1 system with GPS, GLONASS, GALILEO, BEIDOU, QZSS licences and 64 channels

– User can allocate the 64 channels in any ratio between constellations using a slider control.

– Note for different signals on the same constellation (i.e. GPS L1 and GPS L5) it is not possible to have an un-equal

ratio, as in practice the GPS constellation would transmit L1 and L5 signals equally on all satellites. Figure 7
illustrates the concept of the user slider control.

Figure 7 Dynamic channel allocation control concept

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Example GSS7000 Systems

The highly-flexible architecture of the GSS7000 allows many different system configurations. Some may have the required number
of RF Channel Banks to support simultaneous generation of all licenced signals. Some systems may have more licenced signals
than RF Channel Banks allowing support for different combinations of signals.

Figure 8 to 12 show just a few examples of the extensive number of possible combinations and modes of operation. Your Spirent
sales representative will be pleased to guide you through the process of selecting the best configuration for you current and future
test requirements.

Figure 8 Dual-frequency, 2-constellation system Figure 9 Dual-frequency, 3-constellation system

Figure 10 Triple-frequency, 3-constellation system

Figure 11 Dual-frequency, 2-constellation 2RF system

Figure 12 Dual-frequency, GNSS + interference 2RF system

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Upgrades

The extensibility of the GSS7000 means that in-field upgrading of the system can be achieved easily, flexibly and in a way which
matches the developing needs of your testing requirements as closely as possible.

• Existing RF Channel Banks can be issued with new licence keys, allowing extra channels to be added

• Additional constellation licences can be added allowing other signal types to be enabled

• New RF Channel Banks can be added to enable signal types using existing feature keys

• Both RF Channel Banks and new feature keys can be added in the field. It is not necessary for the system to be returned

to Spirent but a one-off purchase is required for a Channel Bank Upgrade Tool Kit which has specific tools to assist with
the upgrade.

• Simulation software can be upgraded by licence key

This extensibility makes the GSS7000 very flexible in terms of future-upgradeability.

Additional upgrade options are listed in the Related Product References, see Table 17. Please contact Spirent to discuss your
requirements.

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Performance Specifications

GNSS Constellations and Supported Ranging Signals

The GSS7000 supports the GNSS constellations and ranging signals as shown in Table 6

Table 6 GNSS constellations and ranging signals

Constellation Carrier Standard Sig Types Licensed Sig Types Notes

GPS L1 C/A, L1C P (inc Pseudo Y)

L23 C/A, L2C P (inc Pseudo Y)

L5 I, Q

4,5

Galileo

E1 OS Data/Pilot

E5ab E5a Data/Pilot, E5b

Data/Pilot

E6 E6-B, E6-C

GLONASS

L1 C/A

L2 C/A

P (Chan No. -7 thru
+6)

P (Chan No. -7 thru
+6)

SBAS8

BeiDou

L1 C/A

L5 I

B1 B1I, B1C

B2 B2I, B2a, B2b

B3 B3I

QZSS

L1 L1S, C/A, L1C

L2 L2c

L5 I, Q, L5S

L6 L61 or L62

NavIC (IRNSS) L5 L5

Multipath is supported through additional channels, where an individual channel is used for every discrete echo.

The GSS7000 supports valid combinations of signals during simulations, per the relevant signal specification documents.

2

1

6

7

1,2 “Pseudo-Y” code is provided using public-domain encryption of P-code to fully support L1/L2 squaring or ‘Z-tracking’, with data

message.

3 C/A code also supported on this carrier as an alternative to L2c.
4 Open Service ICD support supplied as standard.
5 Galileo PRN data available from user definable file. Open Service users are supplied PRN data for E1B/C and E5a signal components, PRN

data for other signal types is ‘dummy data’.

6 E5ab signalling employs 8-PSK modulation of E5a and E5b onto a single carrier. Appropriate carrier dispersion is applied from E5a

to E5b. Channel count per RF Channel Bank is limited to 16 for E5ab.

7 There is no data message on Galileo E6.
8 SBAS includes WAAS, EGNOS, MSAS, GAGAN and SDCM

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Nominal Signal Levels

C/A

-130.0 dBm

E6

E6-B, E6-C

-128.0 dBm

L1c Data + Pilot

-127 dBm

Table 7 Nominal Signal Levels9

System Carrier Signal Level

GPS L1

L1c Pilot code -128.25 dBm

L1c Data code -133.0 dBm

P -133.0 dBm

L2 L2c or C/A -136.0 dBm

P -136.0 dBm

L5 I,Q -127.9 dBm

Galileo E1 E1-B, E1-C -127.0 dBm

E5ab

E5a-I + E5a-Q + E5b-I +
E5b-Q

-122.0 dBm

GLONASS

BeiDou

QZSS

NavIC (IRNSS) L5 C/A -130 dBm

L1 C/A -131 dBm

P -131 dBm

L2 C/A -137 dBm

P -137 dBm

B1 (1.561098 GHz) B1I -133 dBm

B1 (1.57542 GHz) B1C -130 dBm

B2 (1.20714 GHz) B2I -133 dBm

B2 (1.17645 GHz) B2a -127 dBm

B2 (1.20714 GHz) B2b -131 dBm

B3 (1.26852 GHz) B3I -133 dBm

L1 C/A code -128.5 dBm

L1S -131 dBm

L2 L2c -130 dBm

L5

L6 L61/L62 -126.82 dBm10

I + Q -124.9 dBm

L5S -124.0 dBm

9 Nominal signal power levels as defined by Spirent. Using the simulator software, the user has extensive facilities to adjust these nominal

power levels to meet individual GNSS ICD conditions and or specific test needs.

10

Default power level setting is for Block II satellites

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

B-CNAV3

B2b

QZ-CNAV

L2c, L5-I

Spirent GSS7000 Series GNSS Constellation Simulator

Table 8 Navigation Messages Types per Constellation (standard and optional signals)

Constellation Message Type Applicable Signal Requirements Notes

GPS Legacy C/A, P

CNAV L2c, L5-I

CNAV-2 L1c

Galileo I/NAV E1-B, E5b-I OS Galileo

Excludes SOL support

F/NAV E5a-I OS Galileo supported

C/NAV E6-B

GLONASS Public12 L1-C/A

BeiDou D1 and D213 B1I, B2I, B3I

B-CNAV1 B1C

B-CNAV2 B2a

PPP-B2b_I PPP-B2b

Legacy B3I

SBAS Data L1, L5-I

IRNSS Legacy L5

QZSS QZ-Legacy L1 C/A

QZ-L1S L1S

11

14

QZ-CNAV-2 L1c

L6D L61/L62

L6E L62

11 Currently there is no data message on E6-B, Galileo HAS signal will be supported in future release
12 There is no data message on the GLONASS P-code
13 D2 does not include differential corrections or Iono grid.
14 The same message is broadcast at L1 and L5 for any satellite.

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Table 9 Performance Levels for GSS7000 Series

Parameter Description Units Notes

RF Signal Level Carrier Level Control

+15 dB

Maximum

Minimum -40 dB

Resolution 0.1 dB

Linearity +15 dB to -30 dB <0.10 dB

-30.1 dB to -40 dB <0.20 dB

Absolute Accuracy
Run to Run Repeatability

Iteration Rates Supported SimGEN

±0.5 dB
±0.1 dB

10, 100 Hz
Simulation Iteration Rates
(SIR)17

Hardware update rate18 100Hz

Bulk logging update rate 100Hz

Latency (remote data to RF) 4 x SIR

Limit of Signal Dynamics 20 Relative Velocity ±30,000 m/s

Relative Acceleration ±2000 m/s2

Relative Jerk ±22000 m/s3

Angular Rates (at 1.5m
lever arm)

>2π rad/s

>10π rad/s
(indicative) (at 0.05m

lever arm)

Signal Accuracy Pseudorange Accuracy 3 mm RMS

Pseudorange Bias 0 mm RMS

1PPS to RF Alignment < ±2ns

Inter Frequency Alignment < ±250ps (±75mm)

Spectral Purity Harmonics < -40dBc

In-band Spurious (highest

< -182dBW
limit applies)

Phase Noise (single
sideband)

Signal Stability Internal 10.00MHz OCX

Oscillator (after warm up)

Static Multipath Channels Fixed path-length delay per

<0.02

Rad RMS

± 5 x 10-10

per day

0 to 1245m
path

Resolution (approx.) 2.4m

15

16

19

21

22

23

24

25

26

27, 28

29

15 The control range extends to -50dB but performance is unspecified below -40dB. Operation below -20dB is primarily to support antenna pattern and multipath

functionality.
16 At 21oC ±5oC, +15 to -30dB. ±1.5dB 3-sigma all conditions.
17 For single box configuration. Not tested for multibox configuration yet.
18 For the GSS7000 system, the maximum rate at which any value can change is limited by SIR. For example, with a 10Hz SIR, the values applied at the HUR

change at 10Hz. In this case the HUR is applying the same value many times over.
19 Bulk logging at the fastest rate, with many parameters, will result in a reduced scenario duration
20 Note that the signal dynamic limits are dependent on the SIR and HUR.
21 For 6DOF data externally supplied via SimREMOTE or from data file.
22 When operating at 100Hz SIR, with 50m/s3 jerk and 40m/s2 acceleration
23 Digitisation-induced error for signal acceleration < 45m/s2, jerk < 50m/s3, 100Hz SIR.
24 Per carrier operating on a single channel bank. When the same signal is generated across channel banks the inter channel bank bias uncertainty is ±250ps (

±75mm)
25 Between any RF carrier.
26 PRN code alignment between frequency band.
27 For relative velocities <50,000 m/s
28 In-Band Spurious Bandwidths (relative to centre frequency unless otherwise stated):

GPS: L1 ± 20.5MHz , L2 ± 20.5MHz , L5 ± 20.5MHz
Galileo: E1 ± 20MHz , E5a ± 25.5MHz , E5b ± 25.5MHz
GLONASS: (relative to channel frequency 0) L1 ± 20MHz , L2 ± 20MHz
BeiDou: B1/B2 ± 20.5MHz

29 Value is typical, integrated over a 1Hz to 10kHz bandwidth.

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Parameter Description Units Notes

Scenario Duration The maximum duration of a

single scenario

65 days on SimGEN and
SimREPLAYplus

24 days on SimTEST

Latency For the operating in the HIL

40ms
environment, the commands
will take 4 times the SIR to
be effective at RF

Table 10 Embedded interference signal specifications

Parameter Detail Value Notes

Interference Transmitter Per Frequency Band 8 maximum

Frequency Bands L1 band 1539-1615MHz

L2 band 1182-1258MHz

L5band 1154-1230MHz

L6band 1237-1313MHz

Carrier frequency offset

0.5kHz

resolution

Signal types

CW, PSK narrowband/ broadband, CW pulse, AWGN, FM,
AM, PM

RF Signal Level Single signal -47 dBm (max)

Multiple signals -72 dBm (max)

Minimum level per signal -117 dBm

Linearity, per signal, >-97

<0.1 dB
dBm

Linearity: per signal, > –107

<0.2 dB
dBm

Linearity: per signal, > –117

<0.5 dB
dBm

30

31

32

33

34

Table 11 Embedded interference signal modulation types and performance

Signal type Detail Value

BPSK Main lobe width: Wide Band

Narrow Band

20.46 MHz

0.1023 MHz

CW Pulse Pulse width 1 to 10000 μs

Pulse repetition interval range 50 to 10000 μs

Pulse repetition interval resolution 50 μs

Rise time (10% to 90%) 100 ns (max)

On/Off ratio min 30 dB

AWGN 3 dB Bandwidth 0.1 to 20 MHz

Bandwidth resolution 10 kHz

AWGN Pulse 3 dB Bandwidth 0.1 to 20 MHz

Bandwidth resolution 10 kHz

Duty cycle 1 to 50 %

30 Bulk logging of many parameters will reduce the effective scenario duration
31 Simulation running at 10ms SIR.

±38MHz allows for 80% sample rate and 20MHz AWGN

32

33 Single signal per channel bank (CW, FM, PM), -49dBm (BPSK, pulsed CW), -53dBm (AM), -60dBm (AWGN)
34 -72dBm per signal for AWGN signals, other signal types can be up to 3dB higher

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Signal type Detail Value

0.5 to 2 GHz, Insertion Loss 14.5 dB typical

compatible

Pulse rate 0.001 to 20 kHz

FM CW FM deviation ±0.01 to ±15 MHz

FM rate 0.005 to 10 kHz

FM rate step size 0.005 kHz

Modulating Waveform Triangular

AM Modulation depth 10 to 90%

Modulation depth step size 10%

AM rate 0.5 to 10 kHz

Modulating Waveform Sinusoidal

PM Modulation deviation ±0 to ±5 rad

PM rate 0.5 to 10 kHz

Modulating Waveform Sinusoidal

Table 12 Signal Generator Connectivity

Port Type Parameter

Main RF Port Output N-type coax female, 50 Ohm, VSWR <1.2:1

AC coupled ±50 V DC, maximum reverse RF
30 dBm

High Level RF Port Output N-type coax female, 50 Ohm, VSWR <1.2:1

AC coupled ±50 V DC, maximum reverse RF
30 dBm

Auxiliary RF Input N-type coax female, 50 Ohm, VSWR <1.4:1

External Frequency Standard Input BNC coax socket, 50 Ohm

-5 to +10 dBm at 1 MHz, 5 MHz, 10 MHz

Internal Frequency Standard Output BNC coax socket, 50 Ohm

10.00 MHz at +5 dBm nominal

1PPS IN Input BNC coax socket, 50 ohm, TTL level

compatible

1PPS OUT Output BNC coax socket, 50 Ohm, TTL level

compatible

Trigger IN Input BNC coax socket, 50 ohm, TTL level

Table 13 Internal Controller Connectivity

Interface Type Parameter

USB (x4) I/O Mouse, keyboard and general file access

(2 accessed from front + 2 on rear panel)

Ethernet (x2) I/O RJ-45 Ethernet interface standard. Used for general network access and

available for remote control

Display Port I/O Monitor port

Table 14 Optional monitor

Type Type Manufacturer

P2217H 22-inch Dell

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Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Table 15 Physical and Environmental Properties

Part Parameter Value

Signal Generator Approximate Dimensions

(H x W x D)
(9.25” x 4U chassis)

Typical Weight <15kg (33lb) (configuration dependent)

Operating Environment 0 to +50°C (32 to 122°F)

Storage Environment -40 to +60°C (-40 to 140°F)

Electrical Power

176.95mm x 235.2mm x 555mm

6.96” x 9.25” x 21.85”

(40-90% RH, non-condensing)
Altitude restriction of 2000m

(20-90% RH, non-condensing)

100-240V
5A Max
50 to 60Hz

Note(s): Physical and Environmental Properties such as the Operating and Storage Environments apply to the

GSS7000 Signal Generator only. Associated equipment such as the monitor, keyboard and mouse or
other Spirent supplied equipment may not extend to these environmental limits. Optionally the chassis can
be mounted in an equipment rack, details available upon request.

Table 16 Safety and EMC Compliance

Compliance Applicable Standard

Safety Low Voltage Directive (LVD) 2014/35/EU

IEC 60950-1:2005 (Second Edition) + Am 1:2009 + Am 2:2013
Information technology equipment. Safety. General
requirements

EMC EMC Directive 2014/30/EU

EN 61326-1:2013 Electrical equipment for measurement,
control and laboratory use. EMC requirements. General
requirements

26 | spirent.com

Calibration Requirements

The digital architecture of the signal generator requires only limited annual calibration, for which a detailed procedure is
provided.

The GSS7000 GNSS Constellation Simulator is calibrated to the ISO/IEC 17025 standard at the time of purchase, this
accredited calibration comes with a default 12-month calibration period. Annual re-calibration must be carried out at a Spirent
facility or accredited laboratory to maintain this accreditation.

Installation of additional purchased channel banks or performing calibrations out of a Spirent authorized ISO/IEC17025
accredited laboratory will invalidate your accredited calibration. This includes customer use of the Auto Calibration Utility (where
installed) and certain upgrade procedures.

For more information on Spirent’s calibration service, customers may refer to MS3089: Spirent Support Service for Positioning
Technology Products, Customers who require more information on how to renew the annual accredited calibration, may contact
their local Spirent representative.

27 | spirent.com

Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Related Brochures, Data Sheets and Specifications

Table 17 Related Product References

Related Product Description Data Sheet / Specification

SimGEN GNSS Software Suite MS3008

SimAUTO Automotive Sensor Emulation Option

Single Axis Rate Table Option

SimSAFE Vulnerability Test Tool MS3092

SimREMOTE Simulator Remote Control Additional

Options

GSS7765 Generic Interference Generator

Option

SimSENSOR MEMS Sensor Simulation Option MS3086

GBAS GSS4150 VHF Data Broadcast

Simulator for GBAS Product
Specification

SimROUTE

TestBench

Sim3D Realtime Multipath Simulation Tool MS3105

SimHIL Remote Vehicle Capabilities MS3106

Road-Matched Trajectory Generation
Tool

PNT TestBench GNSS Automation
and Report Generation Tool

MS3023
MS3049

MS3015

MS3055

MS3014

MS3073

MS3097

28 | spirent.com

ICD Compliance – Applicable Documents

Segment L5 Interfaces

Table 18 ICD compliance

Reference Title Notes

IS-GPS-200 Navstar GPS Space Segment /

Navigation User Interfaces

IS-GPS-705 Navstar GPS Space Segment / User

IS-GPS-800 L1C Interface Specification

OS SIS ICD Galileo Open Service Signal-in-Space

Interface Control Document

SISICD GLONASS Interface Control Document

OS_SISICD

OS_SISICD BeiDou Navigation Satellite System

Beidou3_ICD_B1C_B2a BeiDou Navigation Satellite System

Beidou3_ICD_B2b BeiDou Navigation Satellite System

RTCA-DO229 WAAS MOPS

IS-QZSS-PNT-001

IS-QZSS-L6-001 Quasi-Zenith Satellite System Interface

IRNSS_SISICD_SPS

NMEA 0183

RINEX -

Spirent operates a policy of upgrades to meet ICD changes as they are adopted, and to implement ICDs for new signals as they
are made public. To obtain ongoing upgrades your system needs to be under warranty or a current support agreement.

Please contact Spirent for current ICD compliance.

BeiDou Navigation Satellite System
(Phase-2) Signal-in-Space Interface
Control Document Open Service Signal

(Phase-2) Signal-in-Space Interface
Control Document Open Service Signal

(Phase-3) Signal-in-Space Interface
Control Document Open Service
Signals

(Phase-3) Signal-in-Space Interface
Control Document Open Service
Signals

Quasi-Zenith Satellite System Interface
Specification Satellite Positioning,
Navigation and Timing Service

Specification Centimeter Level
Augmentation Service

Aug. 2017 IRNSS Signal-in-Space ICD
for SPS

35, 36

ForB2I

For B1I

For B1C, B2a37

For B2b, PPP-B2b

For L1, L2, L5

For L6

35 For the latest ICD compliance, please refer to the latest issues DGP000686AAA SimGEN software user manual, DGP01449AAA

SimREPLAYplus user manual and DGP01446AAA SimTEST user manual
36 Compliance assumes the latest version of control software is installed and the system is fully calibrated
37 BeiDou Phase-3 implementation includes BDGIM Ionospheric model

29 | spirent.com

Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

Glossary of Terms

1PPS One Pulse-Per-Second

BITE Built In Test Equipment

BeiDou Chinese GNSS System

DOP Dilution Of Precision caused by satellite geometry

EMC Electromagnetic Compatibility

FPGA Field-Programmable Gate Array – a reconfigurable electronic device

GALILEO EU GNSS System

GPS Global Positioning System US GNSS system

GNSS Global Navigation Satellite System (Galileo +GPS+SBAS+GLONASS+IRNSS+BeiDou)

GLONASS GLObal NAvigation Satellite System (Russian Federation)

GUI Graphical User Interface

HUR Hardware Update Rate

IRNSS Indian Regional Navigation Satellite System

ICD Interface Control Document

IEEE-488 An 8-bit parallel Hardware Interface

OS Open Service – Galileo

PRS-NOISE

PRN Pseudo-Random Number, representing the unique transmitted signal code

QZSS Quasi-Zenith Satellite System

RAIM Receiver Autonomous Integrity Monitoring

RF Radio Frequency

SBAS Space-Based Augmentation System (such as WAAS, EGNOS, MSAS)

SOL Safety Of Life

SIR Simulation Iteration Rate

A signal with the same spectral distribution as PRS, but with an arbitrary code structure of the correct
chip rate that is phase and frequency correlated with the other Galileo signals

30 | spirent.com

Referenced Documents

a) DGP00686AAA SimGEN Software User Manual [latest issue]

b) DGP01449AAA GSS7000, GSS6700 and SimREPLAYplus User Manual [latest issue]

c) DGP01446AAA SimTEST Software User Manual [latest issue]

d) DGP01491AAA Single Channel Utility User Manual [latest issue]

31 | spirent.com

Datasheet with Product Specification MS7000 Issue 1-14 April 2021

Spirent GSS7000 Series GNSS Constellation Simulator

For More Information

For more information on any aspect of the GSS7000, please contact your Spirent representative or Spirent directly:

Spirent Communications plc

Address: Aspen Way, Paignton, Devon TQ4 7QR, UK

Telephone: [phone]

E-mail: [e-mail]

Website: www.spirent.com

US Government & Defence, Spirent Federal Systems Inc.,

Address: 1402 W. State Road, Pleasant Grove, UT 84062

Telephone: [phone]

E-mail: [e-mail]

Website: www.spirentfederal.com

32 | spirent.com

GNSS9000 SERIES

Platinum
Until 2021

Americas Europe Asia

About Spirent
Positioning Technology

Spirent enables innovation and
development in the GNSS (global
navigation satellite system) and
additional PNT (positioning, navigation
and timing) technologies that are
increasingly influencing our lives.

Our clients promise superior
performance to their customers. By
providing comprehensive and tailored
test solutions, Spirent assures that
our clients fulfil that promise.

Why Spirent?

Over five decades Spirent has brought unrivalled power, control and
precision to positioning, navigation and timing technology. Spirent is trusted
by the leading developers across all segments to consult and deliver on
innovative solutions, using the highest quality dedicated hardware and the
most flexible and intuitive software on the market.

Spirent delivers

• Ground-breaking features proven to perform

• Flexible and customisable systems for future-proofed test capabilities

• World-leading innovation, redefining industry expectations

• First-to-market with new signals and ICDs

• Signals built from first principles — giving the reliable and precise truth

data you need

• Unrivalled investment in customer-focused R&D

• A global customer support network with established experts

ISO/IEC 17025
The GSS7000 is calibrated to the
ISO 17025 standard at the time of delivery.

About Spirent Communications
Spirent Communications (LSE: SPT) is a global leader with deep expertise and decades of experience in testing, assurance, analytics and security,
serving developers, service providers, and enterprise networks. We help bring clarity to increasingly complex technological and business challenges.
Spirent’s customers have made a promise to their customers to deliver superior performance. Spirent assures that those promises are fulfilled. For
more information visit: www.spirent.com

Americas 1-800-SPIRENT

[phone]
[e-mail]

© 2021 Spirent Communications, Inc. All of the company names and/or brand names and/or product names and/or logos referred to in this document, in
particular the name “Spirent” and its logo device, are either registered trademarks or trademarks pending registration in accordance with relevant national
laws. All rights reserved. Specifications subject to change without notice. MS7000 Issue 1-13| 03/21

US Government & Defense

[e-mail]
spirentfederal.com

Europe and the Middle East

[phone]
[e-mail]

Asia and the Pacific

[phone]
[e-mail]