Data Sheet
Noise & Interference
GPS7500
Generator
Count on the noise leader
GPS7500 Noise & Interference Generator
The Noise Com GPS7500 Noise & Interference Generator is ca-
pable of generating up to 40 MHz bandwidth of arbitrary wave-
forms for the test of susceptibility of GPS receivers to jamming,
pulsed, CW, noise and any interference which we could imagine.
A modular approach provides for expandability with additional
independently programmable generators for L1, L2 or L5 bands.
This unique combination allows for a single instrument to sup-
port today’s as well as possible future GPS standards.
Benefits
Integrated Approach: Contains one or optionally two indepen-
dent arbitrary waveform generators. This allows for simultane-
ous testing of the L1 and L2 or L5 frequencies.
Value: Built-in GPS signal and interference combiner, Gaussian
noise source and power meter for automatic high and low power
level calibrations.
Protected Investment: As additional independent bands are
needed the GPS7500 can be easily upgraded. Arbitrary wave-
form generator allows creation of any interference or jamming
waveform which we could image.
True “Standard” for GPS: The GPS7500 was designed to support
all of the current GPS tests of susceptibility to noise and interfer-
ence of DO-229, DO-235 and DO-253.
Ease of Use: Access table of pre-stored GPS testing parameters
made by pressing one button. Cursors automatically lead to GPS
standard template, giving the operator a quick view of all neces-
sary test criteria.
Technical Features
• +21 dBm Output Power
• 1000 to 2000 MHz Synthesizer
• 40 MHz Arbitrary Waveform
• 164.5 dB On/Off Ratio
• +/-0.5 ppm over 0 to 50°C
Applications
GPS Receiver Test and Jamming to:
• RTCA DO-229, DO-235 & DO-253
• Galileo
• GLONASS
• Automotive Standards
• Mobile Phone Location and E911 Service
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Noise Com’s GPS7500 Noise & Interference Generator was de-
signed to support all the GPS testing requirements in an easy to
use platform. Testing receiver susceptibility to interference, in-
tentional or unintentional, has become a requirement and prod-
uct differentiator in airborne, automotive, defense and mobile
phone applications.
While the GPS7500 has been designed around the airborne GPS
Standards, DO-253A, DO-235A and DO-229C with a federal
agency as a lead customer, these standards are among the most
commanding. Based on Noise Com’s digital noise and arbitrary
waveform technology, GPS7500 may generate any GPS interfer-
ence waveform which we could imagine. It is therefore easily ap-
plicable to GPS receiver, chip set and system susceptibility test-
ing in airborne, automotive, defense, mobile location and E911
services.
GPS7500 allows for user preset and user defined arbitrary in-
terference and jamming waveforms. Automatic testing param-
eters for several known GPS requirements have been pre-stored
and are available to the operator for ease of use. The higher
bandwidth (>40 MHz) of the GPS7500 allows for interference
generation over the entire band. With the twochannel option,
measurements can be made simultaneously with independent
waveforms at L1 and L2 or L5 over this higher bandwidth.
NOISE SOURCE
OPTIONAL
R
E
F
ON
ON
/
OFF
/
OFF
PA
PA
COUPLER
OUTPUT
SWITCH
REF
POWER
METER
Built-in calibration and an onboard power meter ensure that
measurements will always be accurate. A true Gaussian noise
source provides a fixed low level reference to which the output
power of the arbitrary waveform can be calibrated. A built-in
power meter assists in this calibration as well as in the setting
of high output power levels up to +21 dBm. The GPS7500 has
three main modes:
• Continuous Wave (CW) Synthesized
• Arbitrary Interference including Broadband Gaussian Noise
• Pulse Mode
Any arbitrary interference waveform which we could imagine
may be generated in the Arbitrary Interference Mode. These
waveforms, which may include sine waves, noise, AM etc., can
then be pulsed at any duty cycle between 0 and 100% at 6.67
nanoseconds resolution. The pulse on/off ratio of 164.5 dB is
obtained in a proprietary switch design also includes circuitry for
the reduction of frequency splatter.
The embedded PC allows for user defined waveforms as well as
custom programming. The Ethernet port supports connection to
a LAN and a TCP/IP command set for remote control.
Modular design allows for a number of options, including dual
channels (L1, L2 or L5) and built-in low phase noise synthesizer.
An optional GPS signal splitter with dual outputs for both an iso-
lated clean reference output and an interference plus GPS com-
bined output is also available.
GPS7500 Block Diagram
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Examples of RTCA Test Cases Supported by the GPS7500
Test Case Frequency(MHz) Noise Bandwidth Power(dBm) Pulse Width Duty Cycle Notes
Broadband Interference 1575.42 100 kHz -110.5 N/A 100%
1575.42 20 MHz -97.5 N/A 100%
Continuous Wave 1525.0 CW -12.0 N/A 100%
Interference (CWI)
1555.42 CW -89.5 N/A 100%
1575.41998 CW -120.5 N/A 100%
1595.42 CW -89.5 N/A 100%
1610.00 CW -30.0 N/A 100%
1618.00 CW -12.0 N/A 100%
1626.00 CW +8.0 N/A 100% Only aircraft with SATCOM
GPS at Maximum 1575.42 100 kHz -110.5 N/A 100% At maximum GPS RF pwr
Power Level 1575.42 20 MHz -97.5 N/A 100% At maximum GPS RF pwr
Pulse Interference 1575.42 100 kHz +20 1 ms 10%
1575.42 100kHz +20 125.0 us 10% Only GPS & WAAS Combo
Interference Level vs. Frequency Interference Level vs. Interference Bandwidth
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Specifications
Description Specification Notes
CW Operating Frequency Range 1000 MHz to 2000 MHz Internal Synthesizer
Noise and Pulse Interference 1575.42 MHz (L1) and optionally
Center Frequences 1227.60 MHz (L2) or 1176.45 MHz (L5) Tunable over +/-20MHz for each Band
Arbitrary Signal (AM, Noise, Pulse) 0 to 40 MHz
3dB Bandwidth
Frequency Stability +/- 0.5 ppm Over 0 to 55 degrees C
Minimum Frequency Resolution 20 kHz
Phase Noise -46 dBc/Hz at +/- 20 kHz Offset Maximum All Modes
-122 dBc/Hz at +/- 100 kHz Offset Typical CW Mode
Typical Spurious Output -52 dBc at <+/- 21.5 MHz Offset All Modes
-80 dBc at >+/- 21.5 MHz Offset CW Mode
Maximum Spurious Output in CW Mode -122.5 dBc between 1564.42 MHz For CW signal at < 1525 MHz or > 1610 MHz
and 1586.42 MHz
Available Output Power +10 dBm at 1000 to 2000 MHz After internal GPS plus Interference
+21 dBm at 1555 to 1595 MHz Combiner
Lowest Output Power -126.5 dBm All Modes
-170.5 dBm/Hz Noise Mode
Output Power Resolution 0.1 dB
Interference/Signal Ratios Up to 155 dB Relative to -134.5 dBm GPS Signal
Minimum Pulse On/Off Ratio 164.5 dB In Pulse Mode, 1575 to 1595 MHz, > +20 dBm.
Pulse Duty Cycle 0 to 100%
Pulse Width Resolution 6.67 ns
Pulse Repetition Rates 5 Hz to 75 MHz
Maximum CW, Noise -41.25 dBm/MHz Isolation to GPS Input
or Pulse Power at GPS Input
General
Processor Pentium
Operating System XP
Display 8.4” TFT-LCD Color
Remote Interface Ethernet GPIB Optional
External Reference Input 10 MHz Internal/External Reference is software selectable
Ordering Information
Part Number Description
GPS7500 Noise & Interference Generator for GPS Testing at L1 Band,
1575.42 MHz +/- 20 MHz
GPSoptL2 Additional independently programmable Noise
and Interference Generator for L2 band, 1226.20 MHz +/- 20 MHz
GPSoptL5 Additional independently programmable Noise and
Interference Generator for L5 band, 1176.45 MHz +/- 20 MHz
GPSoptREF GPS Signal Splitter with Isolated GPS Output for Reference Receiver
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Wireless Telecom Group Inc.
25 Eastmans Rd
Parsippany, NJ
United States
Tel: +1 973 386 9696
Fax: +1 973 386 9191
www.noisecom.com
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© Copyright 2012
All rights reserved.
N/GPS7500/112/EN
Note: Specifications, terms and conditions
are subject to change without prior notice.
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