Spirent GSS7765
Interference Simulation System
Key Features
Fully supported in
Full control over
interference signal content
and dynamics
Wide range of interference
Large power and
frequency range
Modelled and static
operating modes
Interactive mode enables
power and modulation to
be controlled in real-time
Multiple congurations
Compatible with
embedded jamming
(where available on the
underlying system)
Up to 4 fully independent
interference sources
The GSS7765 Interference Simulation System, when combined with one of
Spirents GNSS satellite constellation simulators, offers a comprehensive
solution for testing satellite navigation equipment in the presence of
intentional or unintentional RF interference.
The GSS7765 package comprises one or more high quality commercial
signal generators plus an Interference Combination Unit (ICU). The package
is supported by Spirents SimGEN
software suite.
The GSS7765 offers a very broad range of interfering signal options, which
may be used to represent a varied array of threat sources. Interference
signals available include Continuous Wave (CW), AM, FM, some of which
may be pulsed. The generator also supports noise generation with variable
The GSS7765 can be congured to support up to 4 fully independent
interference sources by the addition of extra generators to the single-source
base conguration.
The SimGEN
software supports three operating modes. Fixed mode
allows a scripted series of events to be dened, while Modelled mode allows
the user to position interference sources in the scenario and model the level
effects as the simulated vehicle moves within the specied environment.
Interactive mode enables the interference source power level and
modulation characteristics to be controlled in real-time.
Interference Simulation System: Spirent GSS7765
shown with Spirent GSS9000 GPS Simulator
Spirent GSS7765
Interference Simulation System
Contact Us
For more information, call your Spirent sales representative or
visit us on the web at www.spirent.com/ContactSpirent.
© 2018 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.
Specications subject to change without notice.
Americas 1-800-SPIRENT
+1-800-774-7368 | sales@spirent.com
US Government & Defense
info@spirentfederal.com | spirentfederal.com
Europe and the Middle East
+44 (0) 1293 767979 | emeainfo@spirent.com
Asia and the Pacic
+86-10-8518-2539 | salesasia@spirent.com
MCD00155 Issue 1-05 | Rev B | 09/18
Output Frequency
• All signal types 500MHz to 2GHz
Resolution 0.01Hz
• Stability <± 1ppm per year
<± 1ppm typical over 0 to 55°C
May also be frequency locked to an external standard of 1,2 or 10MHz
Signal Quality
• Harmonics <-30 dBc
• Non-harmonics <-48 dBc
• Sub-harmonics <-76 dBc
Signal Level at Generator Output
• Noise -169 to –23dBW
• Other signals -166 to –20dBW
• Resolution 0.02 dB
Interference/Signal Ratios (via ICU)
Relative to GPS L1P signal at –163dBW
• Noise -16 to +130 dB
• Other signals -13 to +133 dB
Modulation types
Stepped-CW 2 to 65535 steps, 0.1ms to 100s
dwell time
AM 0 to 90% in 0.1% steps, sine,
square, ramp, triangle rate 0.1Hz
to 10kHz (sine 50kHz), 0.1Hz steps
FM 20MHz max, 0.1% steps, sine,
square, ramp, triangle rate 0.1Hz to
10kHz (sine 50kHz), 0.1Hz steps
NOISE 1Hz to 48MHz bandwidth, 0.1Hz steps
PULSE On/Off ratio >80dB
Rise/Fall <50ns (typ)
Period 2µs to 42s
• RF Output (ICU and generators) Type N female co-axial
Size (HxWxD approx)
• Generators 133 x 426 x 432mm
(5.25 x 16.8 x 17inch)
• ICU 133 x 426 x 200mm
(5.25 x 16.8 x 7.9inch)
Generators <13.5kg (28lb)
1 to 4 generators, plus ICU
Product Specications (MS3055/MS3008) are available
on request
Performance gures and data in this document are typical
and must be specically conrmed in writing by Spirent
Communications plc. before they become applicable to any
particular order or contract.
The publication of information in this document does
not imply freedom from patent or other rights of Spirent
Communications plc. or others.
For current product data, visit the Spirent websites at
www.spirent.com/positioning or www.spirentfederal.com