Datasheet GPSORION Datasheet (MITEL)

The GPS Orion is an evaluation kit to demonstrate the
capability of the Mitel Semiconductor GP2000 Global
Positioning chip set. It is a fully functional GPS receiver design
which provides full 12 channel parallel tracking hardware and
software for GPS system integrators and designers of GPS
receiver subsystems. This new approach offers a complete
GPS receiver ‘engine’ design with the design information
being freely available, providing the ability to integrate GPS
with dedicated IC components. This allows wider design
flexibility and lower cost solutions than using third-party module­based receivers. It enables the GP2000 chipset to be evaluated
in real applications.

GPS Orion

12 Channel GPS Receiver Design

Product Brief

DS4808 - 1.3 August 1997

FEATURES

■ Small board size - 95 mm x 50 mm

■ 12 channel GPS Receiver architecture

■ Highly integrated miniature silicon Front-end IC

■ Low cost 12 Channel Correlator IC

■ 32 bit RISC processor with spare processing

■ Easy to embed into host systems

■ Non-volatile data retention

■ Supported by Development System (GPS Architect)

with access to GPS software source code at minimal
cost

The GPS Orion comprises two boards : a GPS Receiver
board, and an Interface board. The Receiver board is based
on the GP2000 chip set plus complementary components
which make a complete GPS Receiver. The Interface board
provides power and data conditioning interfaces to peripheral
equipment, and long term memory backup.

GPS Receiver Board

The GPS Orion receiver architecture uses integrated
circuits manufactured by Mitel Semiconductor. The GP2000
chipset comprises the GP2015 RF downconverter, the
DW9255 35.42MHz (2MHz BW) IF SAW filter, the GP2021
correlator IC, and the 32-bit ARM60 RISC processor.

The use of a GP2015 RF downconverter offers good
immunity from out-of-band noise, especially when used with
the DW9255 surface mount SAW filter as a 2nd IF filter. The
design offers superior RF performance with a high degree of
noise rejection from digital sources. The 2-bit sampled IF, in
conjunction with triple-conversion architecture provides best­in-class RF jamming resistance.

The GP2021 12 channel correlator can be used to track
C/A code for the Standard Positioning Service. Any channels
not used can be deselected to save power. The digital
interface is compatible with most 16 or 32-bit processors and
the IC includes interface logic to allow it to be easily coupled
to the ARM60 32 bit RISC processor.

Fig.1 GPS Orion Receiver Board with Interface Board

The ARM60-B 32-bit RISC microprocessor offers high
instruction throughput and fast real-time interrupt response.
The ARM60 offers superior performance for 12 channel
processing, which is important for applications such as vehicle
tracking and automotive applications.

Interface Board

The Interface board provides those functions which
would normally be included elsewhere in a GPS system.
These functions include : voltage regulation, battery back-up
(1000 hours memory retention), and serial interfaces to output
the information and to input commands and DGPS correction
data.

Software

The software for GPS Orion is stored in EPROM and is
self-booting. The software provides many facilities including:

NMEA 0183, or proprietary WINMON data interfaces

Navigation position filtering

Satellite Almanac and Ephemeris save and upload

Reliable satellite tracking

RTCM SC-104 Differential Correction input

Data Retention

The Receiver board includes a supercap (0.22 F) which
gives approximately 4 hours retention of volatile data
(position, satellite ephemerides, etc.) in isolation from the
Interface board. The Interface board includes a rechargeable
battery giving approximately 1,000 hours data retention.

GPS Orion

PRODUCT BRIEF

RELATED PRODUCTS

Part No Description Data Sheet

Reference

DW9255 35.42 MHz SAW Filter DS3861

GP2010 GPS RF Front End DS4056

GP2015 GPS RF Front End in TQFP package DS4374

GP2021 12 Channel Correlator DS4077

ARM60 32 Bit RISC Processor DS4004

GPS Architect 12 Channel GPS Development System DS4605

OUTLINE SPECIFICATION

RECEIVER CHARACTERISTICS

GENERAL:

DATUM:

POSITION ACCURACY:

(standard)

POSITION ACCURACY:

(DGPS)

TIME-TO-FIRST-FIX (TTFF - Ref Notes)

● Cold start:

● Warm start:

● Hot start:

RE-ACQUISITION AFTER SIGNAL LOSS:

ANTI-JAMMING RESISTANCE:

2

Fig.2 GPS Orion Architecture

L1 frequency (1575.42MHz), C/A code direct-sequence spread-spectrum,

12 parallel channel continuous-tracking receiver, using 2-bit digital

quantization.

WGS-84 only

25 metres Spherical Error Probability (SEP);

100 metres (2D Root Mean Square) with S/A active.

3 metres SEP, with S/A active.

Typical 90%

105 seconds <165 seconds

<60 seconds

11 seconds <15 seconds

< 2 seconds (90%)

-20dBm CW to within ±7.5MHz of L1 (for <3dB degradation in GPS SNR).

DATA I/O

GPS Orion

PRODUCT BRIEF

WINMON MODE:

(J2 socket)

NMEA MODE:

(J2 socket)

UPDATE RATE:

RTCM DIFFERENTIAL CORRECTIONS:

(J1 socket)

PHYSICAL CHARACTERISTICS - GPS ORION RECEIVER BOARD

PRIME POWER: Vdd into receiver board

EXTERNAL BACKUP POWER: Vdr

ACTIVE-ANTENNA POWER:

POWER CONSUMPTION: Vdd

MEMORY/RTC BACKUP POWER

CONSUMPTION: Vdr

INSTALLED SUPERCAP BACKUP LIFE:

DATA I/O LEVELS:

SIZE: (GPS Orion Receiver Board only)

SIZE: (with GPS Orion Interface Board

attached)

CONNECTORS:

Proprietory GEC-Plessey Semiconductors ASCII interface protocol. Full

input/output interface, controlling all user-definable options.

19200 baud, 8-bits, No Parity, 1 stop bit.

NMEA 0183 V2.01 with GGA, RMC, GSV & GSA (output only - not

configurable).

4800 baud, 8-bits, No parity, 1 stop bit.

Receiver configuration is still available in NMEA mode, by using WINMON

command protocol at 4800 baud, 8-bits, No parity, 1 stop bit.

1 per second (both modes)

RTCM SC-104 (input only) - message types 1, 2 & 9-3

9600 baud, 8-bits, No Parity, 1 stop bit

+5 volts DC, +/- 10%

>+2.2 volts DC, <+5.5volts DC

+5 volts DC available

GPS Receiver Board only: 370mA 1.85W

With Antenna: 395mA 1.98W

60µA @ Vdr > +2.2volts DC

4 hours approx.

CMOS TTL levels (0v & +5v)

95mm x 50mm x 20mm (with RF connector)

95mm x 50mm x 12mm (no RF connector)

95mm x 50mm x 30mm

RF: SMA socket

I/O: 9-pin (1 x 9), 0.1" pitch plug

PHYSICAL CHARACTERISTICS - GPS ORION INTERFACE BOARD

INPUT POWER SUPPLY:

MEMORY / RTC BACKUP BATTERY:

BATTERY CHARGE -

● RATE:

● TOTAL RECHARGE TIME:

BATTERY BACKUP LIFE (when supplying

Vdr pin on GPS Orion receiver board):

DATA I/O LEVELS:

OUTPUT DATA-MODE CHANGE:

SOFT RESET:

CONNECTORS:

ENVIRONMENTAL CHARACTERISTICS (RECEIVER BOARD ONLY)

OPERATING TEMP:

STORAGE TEMP:

+8 volts to +30volts DC

+3.6 v NiCad, 110mAhrs

7.5mA typical

18 hours approx.

8 weeks approx.

RS232 levels (±10v)

Slide switch

Push button

I/O to Orion: 9-pin (1 x 9), 0.1" pitch socket

Power: 2.5mm power socket (centre positive)

RS232: 2 x 9 pin D-type plug

-40°C to +85°C

-50°C to +110°C

3

GPS Orion

NOTES:

1) COLD START:- A cold start results when there is no valid Almanac or Ephemeris information available for the satellite

2) WARM START:- A warm start results when there is a valid Almanac, and the initial time and position are known in SRAM,

3) HOT START:- A hot start results when there is a valid Almanac, valid ephemeris (i.e. less than 4 - 6 hours old), and when

Next step

The GPS Architect is available for designers who wish to develop the software further. This software, which supports the GP2000
chipset is available in both executable and source format, and is available for modification and/or embedding into the target
application. Purchase of a GPS Architect Development System provides optimum flexibility and control in the design approach
demonstrated by the GPS Orion, and includes a licence to modify the software and use it in embedded form with the target
application.

PRODUCT BRIEF

constellation in SRAM, or when the time and/or position information is NOT known (i.e starts at 0 in both
cases).

Also a cold start will be initiated if an Almanac is valid, but a fix cannot be achieved within 10 minutes of
power-up. This could occur if the receiver position has moved significantly since it was last powered-up, but
the position change and time are NOT initialised by the user

but the ephemeris is NOT valid (i.e more than 4 - 6 hours old).

accurate time and position information are also known in SRAM (position error less than 100km, time error
less than 5 minutes). This can be simulated by a momentary Soft-Reset (i.e. press the push-button on the

GPS Orion interface Board).

4

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