Atec Noise-Com-GPS7500 - Manual (Page 3)

3
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.
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.
NOISE SOURCE SWITCH POWER
METER
PA
PA
OPTIONAL
REF
OUTPUT
COUPLER
ON/
OFF
ON/
OFF
R
E
F
GPS7500 Block Diagram