GSS9790

Multi-Output Multi-GNSS

RF Constellation Wave-Front Simulator System

For testing of Controlled Reception Pattern Antenna (CRPA) systems,

spatial testing of single-antenna devices, and as part of real-world-time-

synchronised indoor GNSS implementations

GSS9790

Multi-Output Multi-GNSS RF Constellation Wave-Front Simulator System

For testing of Controlled Reception Pattern Antenna

(CRPA) systems, spatial testing of single-antenna devices

and as part of real-world-time-synchronised indoor GNSS

implementations.

Spirent’s GSS9790 Multi-Output, Multi-GNSS RF Constellation

Wave-Front Simulator System is a development of the world’s

most advanced GNSS Constellation Simulator, the GSS9000.

The GSS9790 is a unique solution providing the core element

for GNSS applications that require a test system that can

be used in both conducted (lab) and radiated (chamber)

conditions.

The GSS9790 can signicantly reduce the need to perform

expensive eld trials and provides an accurate, repeatable

and controllable tool, free of the constraints and security

vulnerabilities imposed by testing in an operational or

eld-test system environment. Equally important, it enables

development and evaluation of GNSS systems in advance of

actual satellite transmissions.

The GSS9790 is a full GNSS RF Constellation Simulator,

offering total user control over the satellite orbital denitions,

propagation and environmental conditions, signal and data

information and accurately models the resulting satellite

motion with respect to the user-specied simulation location,

date and time.

When operated with Spirent’s SimGEN™ control software,

the user equipment under test behaves as if it were receiving

RF signals from real satellites when installed on a vehicle

performing complex and/or high-speed manoeuvres as set up

in the test case, or scenario.

Standard features enabled by the simulation control and

scenario denition software, SimGEN™ include simulation of

multipath reections, terrain obscuration, antenna reception

gain patterns, differential corrections, trajectory generators

for land, air, sea and space vehicles and comprehensive error

generation and system modelling. The product also accepts

user-supplied trajectories, either from a le or supplied in

real-time via remote control interface. This enables testing of

hardware-in-the-loop (HIL) applications and supports ultra-

low latency and high update rates whilst maintaining the full

performance specication.

The GSS9790 is ideal for testing any application that requires

independent access to the RF signals from each of the

simulated GNSS satellites.

CRPA—Control Unit Testing

The GSS9790 can be integrated with a user-supplied multi-

element RF phase shift or delay matrix to produce an RF

wavefront at multiple simulated antenna elements.

CRPA—System Testing

The GSS9790 can be used as the signal generator attached

to multiple transmission antennas installed in an anechoic

chamber. The antennas are spatially distributed to present the

appropriate arrival vectors of the simulated satellite signals

at the antenna site. Interference sources can also be located

anywhere in the chamber to represent different test cases.

By mounting the antenna on a rate table that replicates

the attitude changes of the simulated vehicle platform

comprehensive evaluation of all aspects of the CRPA

system can be achieved in a secure environment, free from

unintentional interference, both incoming and outgoing, and

free from external observation.

Again, using an anechoic chamber with radiating antennas,

the GSS9790 can provide spatial signal diversity for testing

items such as GNSS-equipped personal devices through the

actual antenna. Items such as reectors, signal attenuators (a

dummy human head for example) can be physically placed

adjacent to the unit under test to emulate environments.

Indoor GNSS

With appropriate real-world time synchronisation and

transmission antennas, the GSS9790 can form the basis of an

experimental indoor GNSS implementation.

Traditional Co-Axial Testing

The GSS9790 can also be used as a standard GSS9000 GNSS

simulator for regular receiver testing using its composite

signal output that enables multi-constellation / multi-carrier

simulation from a single output port.

The GSS9790 Solution

The GSS9790 consists of a modied variant of Spirent’s

GSS9000 multi-GNSS simulator platform.

A GSS9790 system consists of 1, 2 or 3 Signal Generator

Chassis and a dedicated C50r Host Unit running Spirent’s

SimGEN™ scenario denition and simulation control software.

The system can operate in two modes: Individual Output

Mode and Composite Output Mode.

In Individual Output Mode, a signal representing each

satellite is available from each of the 10 outputs. In an

Over-The-Air (OTA) application the individual outputs are

connected to transmit antennas located around the anechoic

chamber ceiling representing the approximate sky positions

of the transmitting GNSS satellites, with the DUT located at the

centre (focal point) of the chamber.

Signal Generator

Chassis

C50r Host

In Composite Output Mode, The GSS9790 operates as per

a standard GNSS Constellation Simulator where all GNSS

signals are presented to the single RF output representing

the physical phase centre point of the sky-interface of a GNSS

device’s antenna.

Test Scenario Environment

SimGEN™ GNSS Test Scenario Denition

and Control Software

The GSS9790 is controlled by SimGEN™ running on the

C50r Host. Spirent’s SimGEN™ software suite is the world’s

most capable and advanced GNSS simulation software and

provides an extensive range of simulation features that can be

used to congure and dene the required test scenario.

• Fully automatic and propagated generation of precise

satellite orbital data, ephemerides and almanac

• Proven models for authentic simulation

• Multiplicity of mechanisms for applying declared and

undeclared errors and modications to navigation data,

satellite clocks and orbits

• SimREMOTE: Comprehensive simulation control and

6-DOF trajectory delivery capability

• Data logging and streaming of signal, time, control, vehicle

and trajectory data over a variety of interfaces in real-time

and to le

• Range of models for multipath reections

• 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

• Antenna reception gain and phase patterns

• Satellite transmit antenna pattern control

• Clock g-sensitivity

• Antenna lever arm effects

• INS aiding data

• Ionosphere and Troposphere effects including ionospheric

scintillation

• DGPS corrections

• Pseudorange ramps (for RAIM testing)

• Coherent and non-coherent Interference and noise

modelling (with optional GSS7765 Interference Simulation

System)

• Leap-second and week roll-over event testing

• Antenna Reception Patterns (Gain and Phase)—since the real

antenna is part of the test

• Vehicle motion—unless the DUT antenna can be mounted

on a rate table that is driven consummate with the

SimGEN™ scenario vehicle attitude dynamics

• Multipath denition—if the DUT antenna has Direction Of

Arrival capability—since transmit antenna locations are xed

SimGEN

scenario

Supported Signals

Constellation Frequency

GPS L1, L2, L5

SBAS L1, L5

QZSS L1, L2, L5, L6

Galileo E1, E5, E6

GLONASS L1, L2

BeiDou-2 B1, B2

NavIC/IRNSS L5

RF Outputs

• 1 or 2 composite outputs, per simulator chassis, for

co-axial test applications

• 10 individual outputs, per GNSS constellation carrier

frequency, for anechoic chamber test applications

The system supports eld-upgrade to increase the number of

outputs.

Channels

• Up to 16 satellites simultaneously simulated at each carrier

at the composite output(s), for co-axial test applications

• One satellite signal at one carrier at each individual output,

for anechoic chamber test applications

The system supports eld-upgrade to increase the number of

independent outputs.

For more information, call your Spirent sales representative or

visit us on the web at www.spirent.com/ContactSpirent.

www.spirent.com

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

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

MCD00380 Issue 1-02 | RevB | 11/18

GSS9790

Multi-Output Multi-GNSS RF Constellation Wave-Front Simulator System

Example Congurations:

GPS L1 x 10 channels + GPS L2 x 10 channels with classied

signals

GPS L1 x 10 channels + GPS L2 x 10 channels + GPS L5 x 10

channels with classiﬁed signals, 10-way combined

Capability and Performance—Key Attributes

• Up to 1000Hz Simulation Iteration Rate (SIR) and Hardware

Update Rate (HUR)

• 10 outputs per chassis, plus composite output

• 0.3mm RMS Pseudorange Accuracy

• <0.005 Rad RMS Phase Noise

• 120,000 m/s Relative Velocity, 192,600 m/s

Relative

Acceleration, 890,400 m/s

Relative Jerk (full specication

maintained under these dynamics)

• Highly exible congurations selectable via a ‘cabinet’ of

licence keys

• Complete portability of Spirent SimGEN™ scenarios

• In-eld upgradeability of principal GNSS functionality and

capability

• On-the-y re-conguration of constellation and signal

congurations

• Fully future-proofed for all advances in GNSS technology