MS7000 Datasheet with Product Specification
GSS7000 Series GNSS
Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Spirent GSS7000 Series GNSS Constellation Simulator
PROPRIETARY INFORMATION
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© COPYRIGHT SPIRENT COMMUNICATIONS PLC 2019
The ownership of all other registered trademarks used in this document is duly acknowledged.
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Purpose of this document
This datasheet describes the functionality of the Spirent GSS7000 Series Multi-Frequency, Multi-GNSS RF
Constellation Simulators, which sets a new standard of excellence in GNSS RF Simulation for performance testing
and evaluation of GNSS systems and devices for civil and consumer applications.
This datasheet also provides technical product specification data and configuration information and is to be
used as the basis of a formal quotation or acceptance of a purchase order. Spirent reserves the right to
change this specification at any time.
Please speak to your Spirent sales representative to discuss your requirements.
spirent.com | 3
Table of Contents
Purpose of this document ...........................................................................................................................................2
Table of Contents .......................................................................................................................................................3
List of Tables ...............................................................................................................................................................4
List of Figures .............................................................................................................................................................4
Introduction .................................................................................................................................................................5
GNSS testing using the right methods ..................................................................................................................5
SimGEN™ SimREPLAYplus™ and SimTEST™ operating software .........................................................................7
SimGEN™ .............................................................................................................................................................7
For more information, please refer to the SimGEN User Manual, Reference a) ..................................................8
SimREPLAYplus™ ................................................................................................................................................9
SimTEST™ ..........................................................................................................................................................10
Single Channel Utility (SCU) ...............................................................................................................................11
Before a run .............................................................................................................................................................11
Starting a run ...........................................................................................................................................................11
During a run .............................................................................................................................................................12
After a run ................................................................................................................................................................12
Miscellaneous commands .......................................................................................................................................12
Extensions and Options .......................................................................................................................................13
Compatibility with other Spirent simulator hardware ...............................................................................................14
GSS7000 System Overview .....................................................................................................................................15
GSS7000 Signal Generation flexibility and capability overview ..........................................................................15
GNSS Constellations ................................................................................................................................................16
Flexible Channel Allocation ......................................................................................................................................17
Example GSS7000 systems .....................................................................................................................................18
Upgrades ..................................................................................................................................................................19
Performance Specifications ......................................................................................................................................20
GNSS constellations and supported ranging signals ..........................................................................................20
Nominal signal levels ...........................................................................................................................................21
Calibration Requirements .........................................................................................................................................25
Related Brochures, Data Sheets and Specifications ................................................................................................26
ICD Compliance – Applicable Documents ................................................................................................................26
Glossary of terms ......................................................................................................................................................27
Referenced Documents ............................................................................................................................................28
For more information ................................................................................................................................................29
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
List of Tables
Table 1 Support of extension and optional products ................................................................................................. 13
Table 2 Summary of supported, default and licensable options ................................................................................. 13
Table 3 Single and Dual-RF GSS7000 Software Compatibility .................................................................................. 15
Table 4 Channel Band Allocations.............................................................................................................................. 16
Table 5 Supported constellations for each channel bank ........................................................................................... 16
Table 6 GNSS constellations and ranging signals ..................................................................................................... 20
Table 7 Nominal Signal Levels ................................................................................................................................... 21
Table 8 Navigation Messages Types per Constellation (standard and optional signals) ........................................... 22
Table 9 Performance Levels for GSS7000 Series ...................................................................................................... 23
Table 10 Signal Generator Connectivity ..................................................................................................................... 24
Table 11 Internal Controller Connectivity ................................................................................................................... 24
Table 12 Optional monitor ....................................................................................................................................... 24
Table 13 Physical and Environmental Properties ....................................................................................................... 25
Table 14 Safety and EMC Compliance ...................................................................................................................... 25
Table 15 Related Product References ...................................................................................................................... 26
Table 16 ICD compliance ........................................................................................................................................... 26
List of Figures
Figure 1 Spirent scenario definition and simulation control software (SimGEN™ shown) ........................................... 7
Figure 2 SimREPLAYplus main screen ........................................................................................................................ 9
Figure 3 SimTEST main screen .................................................................................................................................. 10
Figure 4 SimROUTE™ Google Maps® User Motion Trajectory generation tool linked to SimTEST™ ..................... 10
Figure 5 GSS7000 system (Single and dual RF) ....................................................................................................... 15
Figure 6 Dynamic channel allocation control concept ................................................................................................ 17
Figure 7 Dual-frequency, 2-constellation system Figure 8 Dual-frequency, 3-constellation system ..................... 18
Figure 9 Triple-frequency, 3-constellation system Figure 10 Dual-freq, 2-constellation 2RF system ................... 18
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Introduction
The Spirent GSS7000 Series Multi-Frequency, Multi-GNSS RF Constellation Simulator sets a new standard of
excellence in GNSS RF Simulation for performance testing and evaluation of GNSS systems and devices for civil
and consumer applications.
The GSS7000 produces a comprehensive range of emulated multi-GNSS, multi-frequency RF signals with class-
leading flexibility, coherence, fidelity, performance, accuracy and reliability.
The GSS7000 provides numerous benefits to all those working in GNSS/system technology and application
development, including accurate and properly-defined signals, comprehensive and feature-rich simulation and full
control of all aspects of the GNSS operating environment, inherent repeatability and the ability to apply systematic
errors and incidents that are impossible to realise using real satellite signals.
Application of Spirent’s expertise in producing GNSS Test Solutions acquired over the past 30 years, plus
advancements in the performance and efficiency of the state-of-the-art core technology on which the GSS7000 is
built, means that properly-defined GNSS testing is now more accessible than ever, at the entry-level for fundamental
testing, and right through the series to the most capable configuration for advanced testing.
These benefits, together with Spirent’s proven global expertise and support make the Spirent GSS7000 Multi-
Frequency, Multi-GNSS RF Constellation Simulator the essential choice for all civil and consumer device application
test needs.
GNSS testing using the right methods
Regardless of the application for GNSS devices, testing using proper methods is essential. The GSS7000 supports
an extensive range of constellation configurations, which support authentic testing of devices using any of the existing
and planned open-service/civil-use Satellite Navigation signals.
GSS7000 key attributes:
The use of correct and accurate techniques/models to derive satellite constellation and navigation data
parameters commensurate with the applicable ICDs
Dual-RF Option (Available with SimGEN™)
Single Channel Utility for Single Channel Multi-Frequency Simulation
True
1
performance in several key areas such as:
100 Hz System Iteration Rate (SIR) and Hardware Update Rate (HUR)
3mm Pseudorange Accuracy
Zero Pseudorange Bias
<0.02 Rad RMS Phase Noise
Up to 256 channels in one chassis
Highly flexible configurations selectable via feature licence keys
Three operating software options to cover all levels of test
Complete portability of Spirent SimGEN™ scenarios from other Spirent systems
In-field upgradeability of principal GNSS functionality and capability
On-the-fly, run-to-run re-configuration of constellation and signal configurations
All GNSS constellation types and all frequencies within a single chassis
Fully future-proofed for all advances in GNSS systems, signals, modulations, codes and data
1
True Performance means the simulator specification is met for ALL dynamic conditions as specified. Many ‘GNSS simulators’
stop working properly when (even relatively benign) receiver motion is applied because they employ generic hardware.
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
In view of the wide range of possible permutations, Spirent recommends that you discuss your current and future
needs with your local sales representative. Spirent will provide specific configuration and pricing information to meet
your needs.
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SimGEN™ SimREPLAYplus™ and SimTEST™ operating software
The GSS7000 can be operated using any of the three software options from the Spirent “Sim” family, allowing ultimate
choice in the capability and complexity of testing.
SimGEN™ is the world’s leading GNSS simulation software for test scenario definition, execution, data
management and GNSS RF constellation simulator command and control. With the fullest capability, features and
performance continuously developed in close consultation with GNSS system authorities over the last 30 years,
SimGEN™ supports all the GNSS test parameters and control capabilities needed for comprehensive GNSS testing
for research, development and design of GNSS systems, services and devices across any application.
Figure 1 Spirent scenario definition and simulation control software (SimGEN™ shown)
Key SimGEN™ fundamental performance and modelling capabilities:
Fully automatic and propagated generation of precise satellite orbital data, ephemerides and almanac
Multiplicity of mechanisms for applying declared and undeclared errors and modifications to navigation data,
Satellite clocks and orbits
SimREMOTE: Comprehensive remote simulation control and 6-DOF trajectory delivery capability
Generation of trajectories based on extensive Google® Mapping data
Data logging and streaming of signal, time, control, vehicle and trajectory data over a variety of interfaces in
real-time and to file
Range of models for Multipath reflections
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
Vehicle antenna reception gain and phase patterns
Satellite transmit antenna pattern control
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Clock G-sensitivity
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 (optional GSS7765 Interference Generator)
Leap-second and week roll-over event testing
For more information, please refer to the SimGEN User Manual, Reference a)
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SimREPLAYplus™ is designed to allow the replay of pre-defined test scenarios whilst providing a range of
tools and capabilities to enhance usability before, during and after testing. A powerful feature of SimREPLAYplus™
is the ability to replay complex scenarios which have been created on other Spirent SimGEN™- controlled systems.
Depending on the hardware and constellation licences installed, the full complexity of the SimGEN™ scenario is
faithfully replayed in SimREPLAYplus™ but without the detailed scenario editing and modification capability. This is
ideal for controlled test planning where a central R&D lab can issue version-controlled test scenarios out to other
teams, knowing the detailed test parameters cannot be altered by mistake.
Figure 2 SimREPLAYplus main screen
Key SimREPLAYplus™ features:
Interactive run time control
Share scenarios between systems to facilitate collaboration
Save and compare device under test data with logged simulation data
Receiver antenna pattern modelling
Environment terrain modelling
Edit and save time, date and location
Use motion from logged NMEA and Google Maps® matched trajectories via the SimROUTE™ tool
Flexibly allocate available hardware channels across licenced constellations
Display simulation parameters
Display sky plot
Selected remote control capability via Ethernet connection
Bulk logging of scenario data
NMEA input and Output
RTCM output
For more information, please refer to the SimREPLAYplus for GSS6700 and GSS7000 User Manual, reference b)
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
SimTEST™ is for essential testing. It provides the capability needed to perform fundamental verification tests.
Spirent’s complex and precise modelling of constellations and navigation data is built-in providing maximum ease of
use to the user. Simply set up a few key parameters and press ‘run’.
Figure 3 SimTEST main screen
Figure 4 SimROUTE™ Google Maps® User Motion Trajectory generation tool linked to SimTEST™
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Key SimTEST™ features include:
Edit and save time and date
Enable/disable atmospheric modelling
Enable/disable multipath
Interactive power control of each individual constellation
Load real constellation almanacs
Choose Static position, simple motion, ‘racetrack motion’ or Google Maps® matched trajectories via the
SimROUTE™ tool
Edit, enable and disable RX Antenna Level Patterns
Simulate leap second events
Flexibly allocate available hardware channels across licenced constellations
Display simulation parameters
Display sky plot
Selected remote control capability via Ethernet connection
For more information, please refer to the SimTEST Software User Manual Reference c)
Single Channel Utility (SCU)
The GSS7000 supports the generation of a single channel satellite signal for each licenced constellation. This
allows individual control of several parameters via remote commands including: A satellite’s carrier frequency,
power level, velocity profile and PRN, secondary code and navigation data. Commands are formatted according to
Spirent’s SimREMOTE™ ICD and are sent via TCP/IP
Commands can be grouped into the following 5 sets:
Before a run
Description
Enable constellation frequencies
Set the initial pseudorange
Set the signal SVID and PRN
Set the external reference frequency
Set the simulation start time and duration
Set the trigger mode
Starting a run
Description
AR Arm the simulation
AR_NOWAIT Arm the simulation, response returned immediately
GET_EXT_REF Return the status of any time reference signal
RU Run the simulation
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Description
RU_NOWAIT Run the simulation, response returned immediately
During a run
Description
End a running scenario
Set the power level of a satellite signal
Set signal velocity profile
Set signal velocity and doppler
Set PRN, BeiDou secondary code and navigation
data on/off
Turn navigation data parity errors on and off
Get the time into run
After a run
Description
RW Rewind a simulation that has ended
Miscellaneous commands
Command
Description
EXIT_SIMGEN Terminate the PosApp Engine
GET_ANT_FREQS Return the enabled constellation frequencies
*IDN? Return the software version
LOG_DIR Return the log file folder
MSG_REPORTING_FILE_NAME Return the message log file name
NULL Return the status information
STTIME Return the simulation start time
For more information, refer to the Single Channel Utility User Manual DGP01491AAA
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Extensions and Options
With the appropriate licences; extensions and options are available with the GSS7000 to facilitate development and
testing of systems and applications which use other signals for navigation, including;
MEMS INS sensor output data modelling with SimSENSOR™
In-Vehicle Navigation System (IVNS) testing with SimAUTO™
Interference signal generation, using the GSS7725™ Interference Generator, where interference waveforms
are combined and played back along with GNSS signals from the GSS7000 system.
Table 1 shows the support for extension and optional products with GSS7000.
Product Support @ SimTEST Support @ SimREPLAYplus Support @ SimGEN
SimINERTIAL
NO
NO
NO
SimAUTO
NO
YES
YES
SimSENSOR
NO
YES
YES
SimSAFE
NO
NO
Roadmap
GSS7765
NO
YES
YES
GSS7725
YES
YES
YES
SimROUTE
Embedded
Embedded
Embedded
Classified options
NO
NO
NO
GBAS Simulation
NO
NO
YES
ScramNET I/O
NO
NO
NO
Table 1 Support of extension and optional products
Table 2 shows a summary of default and licenced options across the three software levels for the GSS7000
Product Support @ SimTEST Support @ SimREPLAYplus Support @ SimGEN
Fixed Offset Multipath By default By default By default
Standalone SBAS and all QZSS Licenced Licenced Licenced
Land Mobile Multipath X By default By default
GPS P Code (inc Pseudo Y) Licenced Licenced By default
GLONASS P Code Licenced Licenced By default
GPS L1C By default By default By default
GPS L2C By default By default By default
BeiDou B1I, B1C, B2I, B2a, B3I Licenced Licenced Licenced
NavIC (IRNSS) L5 Licenced Licenced Licenced
SimAUTO X Licenced Licenced
GSS7000 Channel Usage By default By default By default
GSS7765 X Licenced Licenced
SimROUTE By default By default By default
REPLAY of SimGEN scenarios X By default By default
GBAS via the GSS4150 X X Licenced
Table 2 Summary of supported, default and licensable options
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Compatibility with other Spirent simulator hardware
Note the GSS7000 is a standalone system. It is not possible to connect the GSS7000 to other GNSS Simulator
hardware platforms in a system controlled by a common test scenario. Note this does not apply to ancillary options
such as the GSS7725, SimAUTO and GSS4150 GBAS simulator
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GSS7000 System Overview
The GSS7000 consists of a single bench-top unit with internal controller running the appropriate operating software.
Peripherals (monitor, keyboard and mouse), are optional and can be supplied.
Figure 5 GSS7000 system (Single and dual RF)
GSS7000 Signal Generation flexibility and capability overview
A single GSS7000 chassis can support a maximum of 4 generic channel banks (a channel bank consists of a
digital signal generator and RF upconverter). The signals from all banks are combined and fed simultaneously
to the front-panel primary RF output and rear-panel high-level output.
Each channel bank can be configured to generate up to 64 channels of any signal type within one of four
frequency bands. Multiple constellations can be generated from a single channel bank simultaneously,
providing they are all from the same frequency band. Refer to Table 4 for details of signal type groupings.
The total number of channels in any one chassis is 256.
The configuration of constellation/frequency is fixed for the duration of the simulation run.
The constellations/frequencies available to the user are dependent upon the licences that are installed.
The GSS7000 supports the opportunity for in-field RF channel bank hardware upgrade.
The GSS7000 supports a 100Hz SIR.
The GSS7000 supports backwards compatibility with Spirent SimREPLAYplus™ and SimGEN™ scenarios.
The GSS7000 is available as a single or dual-RF chassis. Table 3 provides details of software support.
Product variant
Support @
SimTEST
Support @
SimREPLAYplus
Support @
SimGEN
GSS7000 Single-RF
YES
YES
YES
GSS7000 Dual-RF
NO
NO
YES
Table 3 Single and Dual-RF GSS7000 Software Compatibility
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Table 4 Channel Band Allocations
Carrier Freq (MHz) Band
1176.45 1
1191.795 1
1202.025 2
1207.14 2
1227.6 2
1245.781 2
1268.52 3
1278.75 3
1561.098 4
1575.42 4
1575.42 4
1601.719 4
Table 5 Supported constellations for each channel bank
Constellation Frequency
GPS/SBAS L1
GPS L2
GPS/SBAS L5
Galileo E1
Galileo E5
GLONASS L1
GLONASS L2
BeiDou-2 B1I
BeiDou-2 B2I
BeiDou B1C B1C
BeiDou B2a B2a
Beidou B3I B3I
SBAS (note 1) L1
SBAS (note 1) L5
QZSS L1
QZSS L2
QZSS L5
QZSS L6
NavIC/(IRNSS) L5
Others (see notes for Table 5) -
GNSS Constellations
The GSS7000 architecture supports GNSS signal generation capability in a very flexible way. With the appropriate
constellation feature licence keys, each generic RF Channel Bank can support – at any one time – any number of
constellation types within the same band - as shown in Table 5. (Note: for current ICD compliance, see Table 16).
The combinations of constellations generated can vary from scenario to scenario and even between successive runs
of the same scenario, depending on the settings in the control software. The principle is that at a particular instant in
time, signals from any constellation can be generated provided there is a valid feature licence key and an available
RF Channel Bank with the requisite number of licenced channels in the system.
Notes for Table 5
SBAS (WAAS, EGNOS, MSAS) will be provided with any purchase of GPS L1 or L5, respectively. GPS
satellite signals are substituted for SBAS ones as required. For non-GPS systems, it is possible to order
SBAS as a separate signal.
The GSS7000 is technology-ready for support of other future GNSS systems/signals, some of which can be
supported today through Spirent’s Tailored Solutions. Others are planned on the product roadmap.
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Flexible Channel Allocation
A useful feature of the GSS7000 is the flexible way licenced satellite channels can be assigned to constellations.
For example:
Consider a L1 system with GPS, GLONASS, GALILEO, BEIDOU, QZSS licences and 64 channels
User can allocate the 64 channels in any ratio between constellations using a slider control.
Note for different signals on the same constellation (i.e. GPS L1 and GPS L5) it is not possible to have an
un-equal ratio, as in practice the GPS constellation would transmit L1 and L5 signals equally on all satellites.
Figure 6 illustrates the concept of the user slider control.
Figure 6 Dynamic channel allocation control concept
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Example GSS7000 systems
The highly-flexible architecture of the GSS7000 allows many different system configurations. Some may have the
required number of RF Channel Banks to support simultaneous generation of all licenced signals. Some systems
may have more licenced signals than RF Channel Banks allowing support for different combinations of signals.
Figure 7 to 10 show just a few examples of the extensive number of possible combinations and modes of operation.
Your Spirent sales representative will be pleased to guide you through the process of selecting the best configuration
for you current and future test requirements.
Figure 7 Dual-frequency, 2-constellation system Figure 8 Dual-frequency, 3-constellation system
Figure 9 Triple-frequency, 3-constellation system Figure 10 Dual-freq, 2-constellation 2RF system
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Upgrades
The extensibility of the GSS7000 means that in-field upgrading of the system can be achieved easily, flexibly and
in a way which matches the developing needs of your testing requirements as closely as possible.
Existing RF Channel Banks can be issued with new licence keys, allowing extra channels to be added
Additional constellation licences can be added allowing other signal types to be enabled
New RF Channel Banks can be added to enable signal types using existing feature keys
Both RF Channel Banks and new feature keys can be added in the field. It is not necessary for the system to
be returned to Spirent but a one-off purchase is required for a Channel Bank Upgrade Tool Kit which has
specific tools to assist with the upgrade.
Simulation software can be upgraded by licence key
T
his extensibility makes the GSS7000 very flexible in terms of future-upgradeability.
Additional upgrade options are listed in the Related Product References, see Table 15. Please contact Spirent to
discuss your requirements.
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Performance Specifications
GNSS constellations and supported ranging signals
The GSS7000 supports the GNSS constellations and ranging signals as shown in Table 6
Constellation Carrier Standard Sig Types Licensed Sig Types Notes
GPS
L1
C/A, L1c
P (inc Pseudo Y)
2
L2
3
C/A, L2c
P (inc Pseudo Y)
1
L5
I, Q
Galileo
4,5
E1
OS Data/Pilot
E5ab
E5a Data/Pilot, E5b
Data/Pilot
6
GLONASS
L1
C/A
P (Chan No. -7 thru +6)
L2
C/A
P (Chan No. -7 thru +6)
SBAS
7
L1
C/A
L5
I
BeiDou
B1
B1I, B1C
B2
B1I, B2a
QZSS
L1
L1S, C/A
L1c
L2
L2c
L5
I, Q
L6
L61 or L62
NavIC (IRNSS)
L5
L5
Table 6 GNSS constellations and ranging signals
Multipath is supported through additional channels, where an individual channel is used for every discrete echo.
The GSS7000 supports valid combinations of signals during simulations, per the relevant signal specification
documents.
2
“Pseudo-Y” code is provided using public-domain encryption of P-code to fully support L1/L2 squaring or ‘Z-tracking’,
with data message.
3
C/A code also supported on this carrier as an alternative to L2c.
4
Open Service ICD support supplied as standard.
5
Galileo PRN data available from user definable file. Open Service users are supplied PRN data for E1B/C and E5a signal
components, PRN data for other signal types is ‘dummy data’.
6
E5ab signalling employs 8-PSK modulation of E5a and E5b onto a single carrier. Appropriate carrier dispersion is
applied from E5a to E5b. Channel count per RF Channel Bank is limited to 16 for E5ab
7
SBAS includes WAAS, EGNOS, MSA, GAGAN and SDCM for Glonass
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Nominal signal levels
System Carrier Signal Level
GPS
L1
C/A
-130.0 dBm
L1c Pilot code
-128.25 dBm
L1c Data code
-133.0 dBm
P
-133.0 dBm
L2
L2c or C/A
-136.0 dBm
P
-136.0 dBm
L5
I,Q
-127.9 dBm
Galileo
E1
E1-B, E1-C
-128.0 dBm
E5ab
E5a-I + E5a-Q + E5b-I
+ E5b-Q
-122.0 dBm
GLONASS
L1
C/A
-131 dBm
P
-131 dBm
L2
C/A
-137 dBm
P
-137 dBm
BeiDou
B1 (1.561098 GHz)
B1I
-133 dBm
B1 (1.57542 GHz)
B1C
-130dBm
B2 (1.20714 GHz)
B2I
-133 dBm
B2 (1.17645 GHz)
B2a
-127dBm
B3 (1.26852 GHz)
B3I
-133dBm
QZSS
L1
C/A code
-128.5dBm
L1S
-131dBm
L1c Data + Pilot
-127dBm
L2
L2c
-130dBm
L5
I + Q
-124.9dBm
L6
L61/L62
-126.82dBm
8
NavIC (IRNSS)
L5
C/A
-130dBm
Table 7 Nominal Signal Levels
9
8
Default power level setting is for Block II satellites
9 Nominal signal power levels as defined by Spirent. Using the simulator software, the user has extensive facilities to adjust
these nominal power levels to meet individual GNSS ICD conditions and or specific test needs.
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Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Constellation Message Type Applicable Signal Requirements Notes
GPS
Legacy C/A, P
CNAV L2c, L5-I
CNAV-2 L1c
Galileo
I/NAV E1-B, E5b-I
OS Galileo
Excludes SOL support
F/NAV E5a-I OS Galileo supported
GLONASS Public
10
L1-C/A
BeiDou
D1 and D2
11
B1I, B2I
B1C, B2a
12
Legacy B3I
SBAS Data L1, L5-I
13
IRNSS Legacy L5
QZSS
QZ-Legacy
L1 C/A,
L1S
QZ-CNAV L2c, L5-I
QZ-CNAV-2 L1c
L6D L61/L62
L6E L62
Table 8 Navigation Messages Types per Constellation (standard and optional signals)
10
There is no data message on the GLONASS P-code
11
D2 does not include differential corrections or Iono grid.
12
As at this issue, Generated nav. data in the latest format (i.e. B-CNAV1 and B-CNAV2) for the new B2A and B1C is not
currently available. Legacy BeiDou Phase 2 navigation data will be broadcast instead when “generated” nav. will be selected.
Note: should legacy navigation data be selected, it will be broadcast at the legacy rate, not the rate defined in reference [g)] for
signals B2A and B1. When the nav data was read from file, it will follow the symbol rate defined in reference [g)]. BeiDou
Phase-3 is supported in accordance with Beidou3_ICD_B1C_B2a Beta version, 2017-08. Customers purchasing BeiDou
Phase-3 licence keys for B1C and/or B2A will receive a FOC software upgrade when the implementation to BDS-SIS-ICD-
B1C/B2A-1.0 2017-12 is completed. Spirent plans to complete this implementation by end Q3-2018
13
The same message is broadcast at L1 and L5 for any satellite.
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Table 9 Performance Levels for GSS7000 Series
Parameter Description Units Notes
RF Signal Level
Carrier Level Control
Maximum
+15 dB
Minimum
-40 dB
14
Resolution
0.1 dB
Linearity +15 dB to -30 dB
<0.10 dB
-30.1 dB to -40 dB
<0.20 dB
Absolute Accuracy
Run to Run Repeatability
±0.5 dB
±0.1 dB
15
Iteration Rates
Supported SimGEN Simulation
Iteration Rates (SIR)
16,
10, 100 Hz
Hardware update rate
17
100Hz
Bulk logging update rate
100Hz
18
Latency (remote data to RF)
4 x SIR
Limit of Signal
Dynamics
19
Relative Velocity
±30,000 m/s
20
Relative Acceleration
±2000 m/s
2
21
Relative Jerk
±22000 m/s
3
Angular Rates (at 1.5m lever arm)
(indicative) (at 0.05m lever arm)
>2
π
rad/s
>10
π
rad/s
Signal Accuracy
Pseudorange Accuracy
3 mm RMS
22
Pseudorange Bias
0 mm RMS
23
1PPS to RF Alignment
< ±2ns
24
Inter Frequency Alignment
< ±250ps (±75mm)
25
Spectral Purity
Harmonics
< -40dBc
In-band Spurious (highest limit
applies)
< -182dBW
26, 27
Phase Noise (single sideband)
<0.02
Rad RMS
28
Signal Stability
Internal 10.00MHz OCX Oscillator
(after warm up)
± 5 x 10
-10
per day
Static Multipath
Channels
Fixed path-length delay per path
0 to 1245m
Resolution (approx.)
2.4m
14
The control range extends to -50dB but performance is unspecified below -40dB. Operation below -20dB is primarily to support antenna pattern and multipath
functionality.
15
At 21
o
C ±5
o
C, +15 to -30dB. ±1.5dB 3-sigma all conditions.
16
For single box configuration. Not tested for multibox configuration yet.
17
For the GSS7000 system, the maximum rate at which any value can change is limited by SIR. For example, with a 10Hz SIR, the values applied at the HUR
change at 10Hz. In this case the HUR is applying the same value many times over.
18
Bulk logging at the fastest rate, with many parameters, will result in a reduced scenario duration
19
Note that the signal dynamic limits are dependent on the SIR and HUR.
20
For 6DOF data externally supplied via SimREMOTE or from data file.
21
When operating at 100Hz SIR, with 50m/s
3
jerk and 40m/s
2
acceleration
22
Digitisation-induced error for signal acceleration < 45m/s
2
, jerk < 50m/s
3
, 100Hz SIR.
23
Per carrier operating on a single channel bank. When the same signal is generated across channel banks the inter channel bank bias uncertainty is ±250ps (
±75mm)
24
Between any RF carrier.
25
PRN code alignment between frequency band.
26
For relative velocities <50,000 m/s
27
In-Band Spurious Bandwidths (relative to centre frequency unless otherwise stated):
GPS: L1 ± 20.5MHz , L2 ± 20.5MHz , L5 ± 20.5MHz
Galileo: E1 ± 20MHz , E5a ± 25.5MHz , E5b ± 25.5MHz
GLONASS: (relative to channel frequency 0) L1 ± 20MHz , L2 ± 20MHz
BeiDou: B1/B2 ± 20.5MHz
28
Value is typical, integrated over a 1Hz to 10kHz bandwidth.
24 | spirent.com
Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Parameter Description Units Notes
Scenario Duration
The maximum duration of a single
scenario
23 days 23 hours 59
minutes
29
Latency
For the operating in the HIL
environment, the commands will take
4 times the SIR to be effective at RF
40ms
30
Table 10 Signal Generator Connectivity
Port Type Parameter
Main RF Port Output
N-type coax female, 50 Ohm, VSWR <1.2:1
AC coupled ±50 V DC, maximum reverse RF 30 dBm
High Level RF Port Output
N-type coax female, 50 Ohm, VSWR <1.2:1
AC coupled ±50 V DC, maximum reverse RF 30 dBm
Auxiliary RF Input
N-type coax female, 50 Ohm, VSWR <1.4:1
0.5 to 2 GHz, Insertion Loss 14.5 dB typical
External Frequency
Standard
Input
BNC coax socket, 50 Ohm
-5 to +10 dBm at 1 MHz, 5 MHz, 10 MHz
Internal Frequency
Standard
Output
BNC coax socket, 50 Ohm
10.00 MHz at +5 dBm nominal
1PPS IN Input BNC coax socket, 50 ohm, TTL level compatible
1PPS OUT Output BNC coax socket, 50 Ohm, TTL level compatible
Trigger IN Input BNC coax socket, 50 ohm, TTL level compatible
Table 11 Internal Controller Connectivity
Interface Type Parameter
USB (x4) I/O
Mouse, keyboard and general file access
(2 accessed from front + 2 on rear panel)
Ethernet (x2) I/O
RJ-45 Ethernet interface standard. Used for general network access
and available for remote control
Display Port I/O Monitor port
Table 12 Optional monitor
Type Type Manufacturer
P2217H 22-inch
Dell
29
Bulk logging of many parameters will reduce the effective scenario duration
30
Simulation running at 10ms SIR.
spirent.com | 25
Table 13 Physical and Environmental Properties
Part Parameter Value
Signal Generator Approximate Dimensions
(H x W x D)
(9.25” x 4U chassis)
176.95mm x 235.2mm x 555mm
6.96” x 9.25” x 21.85”
Typical Weight <15kg (33lb) (configuration dependent)
Operating Environment
0 to +50°C (32 to 122°F)
(40-90% RH, non-condensing)
Altitude restriction of 2000m
Storage Environment
-40 to +60°C (-40 to 140°F)
(20-90% RH, non-condensing)
Electrical Power
100-240V
5A Max
50 to 60Hz
Note(s): Physical and Environmental Properties such as the Operating and Storage Environments apply
to the GSS7000 Signal Generator only. Associated equipment such as the monitor, keyboard
and mouse or other Spirent supplied equipment may not extend to these environmental limits.
Optionally the chassis can be mounted in an equipment rack, details available upon request.
Table 14 Safety and EMC Compliance
Compliance Applicable Standard
Safety
Low Voltage Directive (LVD) 2014/35/EU
IEC 60950-1:2005 (Second Edition) + Am 1:2009 + Am 2:2013 Information technology
equipment. Safety. General requirements
EMC
EMC Directive 2014/30/EU
EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use. EMC
requirements. General requirements
Calibration Requirements
The digital architecture of the signal generator requires only limited annual calibration, for which a detailed
procedure is provided.
The GSS7000 GNSS Constellation Simulator is accredited to the ISO/IEC 17025:2005 standard at the time of
purchase, annual calibration needs to be carried out at Spirent facilities or accredited labs to maintain this
accreditation.
26 | spirent.com
Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Related Brochures, Data Sheets and Specifications
Table 15 Related Product References
Related Product Description
Data Sheet /
Specification
SimGEN GNSS Software Suite MS3008
SimAUTO
Automotive Sensor Emulation Option
Single Axis Rate Table Option
MS3023
MS3049
SimSAFE Vulnerability Test Tool MS3092
SimREMOTE Simulator Remote Control Additional Options MS3015
GSS7765 Generic Interference Generator Option MS3055
GSS7725 Interference Generator option MS7725
SimSENSOR MEMS Sensor Simulation Option MS3086
GBAS GSS4150 VHF Data Broadcast Simulator for GBAS Product Specification MS3014
SimROUTE Road-Matched Trajectory Generation Tool MS3073
TestBench PNT TestBench GNSS Automation and Report Generation Tool MS3097
ICD Compliance – Applicable Documents
Table 16 ICD compliance
31
Reference Title Issue Notes
IS-GPS-200 Navstar GPS Space Segment / Navigation User Interfaces H
IS-GPS-705 Navstar GPS Space Segment / User Segment L5 Interfaces D
IS-GPS-800 L1C Interface Specification D
OS SIS ICD Galileo Open Service Signal-in-Space Interface Control Document 1.1
SISICD GLONASS Interface Control Document 5.1(2)
OS_SISICD
BeiDou Navigation Satellite System (Phase-2) Signal-in-Space
Interface Control Document Open Service Signal
2.1 For B1I, B2I
Beidou3_ICD_B1C_B2a
BeiDou Navigation Satellite System (Phase-3) Signal-in-Space
Interface Control Document Open Service Signals
1.0 For B1C, B2a
32
RTCA-DO229 WAAS MOPS D
IS-QZSS-PNT-001
Quasi-Zenith Satellite System Interface Specification Satellite
Positioning, Navigation and Timing Service
003 For L1, L2, L5
IS-QZSS-L6-001
Quasi-Zenith Satellite System Interface Specification Centimeter Level
Augmentation Service
001 For L6
IRNSS_SISICD_SPS Aug. 2017 IRNSS Signal-in-Space ICD for SPS 1.1
NMEA 0183 4.10
RINEX - 3.02
31
Compliance assumes the latest version of control software is installed and the system is fully calibrated
32
As at this issue, BeiDou Phase-3 is supported but excluding the BDGIM Ionospheric model.
spirent.com | 27
Spirent operates a policy of upgrades to meet ICD changes as they are adopted, and to implement ICDs for new
signals as they are made public. To obtain ongoing upgrades your system needs to be under warranty or a current
support agreement.
Please contact Spirent for current ICD compliance.
Glossary of terms
1PPS One Pulse-Per-Second
BITE Built In Test Equipment
BeiDou
Chinese GNSS System
DOP Dilution Of Precision caused by satellite geometry
EMC
Electromagnetic Compatibility
FPGA Field-Programmable Gate Array – a reconfigurable electronic device
GALILEO
EU GNSS System
GPS Global Positioning System US GNSS system
GNSS
Global Navigation Satellite System (Galileo +GPS+SBAS+GLONASS+IRNSS+BeiDou)
GLONASS GLObal NAvigation Satellite System (Russian Federation)
GUI
Graphical User Interface
HUR Hardware Update Rate
IRNSS
Indian Regional Navigation Satellite System
ICD Interface Control Document
IEEE-488
An 8-bit parallel Hardware Interface
OS Open Service – Galileo
PRS-NOISE A signal with the same spectral distribution as PRS, but with an arbitrary code structure of the
correct chip rate that is phase and frequency correlated with the other Galileo signals
PRN
Pseudo-Random Number, representing the unique transmitted signal code
QZSS Quasi-Zenith Satellite System
RAIM
Receiver Autonomous Integrity Monitoring
RF Radio Frequency
SBAS
Space-Based Augmentation System (such as WAAS, EGNOS, MSAS)
SOL Safety Of Life
SIR
Simulation Iteration Rate
28 | spirent.com
Spirent GSS7000 GNSS Constellation Simulator
Datasheet with Product Specification MS7000 Issue 1-10 June 2019
Referenced Documents
a) DGP00686AAA SimGEN Software User Manual [latest issue]
b) DGP01449AAA GSS7000, GSS6700 and SimREPLAYplus User Manual [latest issue]
c) DGP01446AAA SimTEST Software User Manual [latest issue]
spirent.com | 29
For more information
For more information on any aspect of the GSS7000, please contact your Spirent representative or Spirent directly:
Spirent Communications plc
Address: Aspen Way, Paignton, Devon TQ4 7QR, UK
Telephone: +44 1803 456325
E-mail: globalsales@spirent.com
Website: www.spirent.com
US Government & Defence, Spirent Federal Systems Inc.,
Address: 1402 W. State Road, Pleasant Grove, UT 84062
Telephone: +1 801 785 1448
E-mail: info@spirentfederal.com
Website: www.spirentfederal.com
Datasheet MS7000 Issue 1-08 June 2019
Spirent GSS7000 Series GNSS Constellation Simulator
spirent.com
Spirent Communications plc, Aspen Way, Paignton, Devon TQ4 7QR, UK
Tel +44 (0)1803 546300 Fax +44 (0)1803 546301
http://www.spirent.com/Solutions/GNSS-Developers
Registered in England Number 00470893
Registered office: Northwood Park, Gatwick Road, Crawley, West Sussex RH10 9XN, UK
© 2017 Spirent. All Rights Reserved.
All of the company names and/or brand names and/or product names referred to in this document, in particular, the name “Spirent” and its logo
device, are either registered trademarks or trademarks of Spirent plc and its subsidiaries, pending registration in accordance with relevant national
laws.
All other registered trademarks or trademarks are the property of their respective owners.
The information contained in this document is subject to change without notice and does not represent a commitment on the part of Spirent. The
information in this document is believed to be accurate and reliable; however, Spirent assumes no responsibility or liability for any errors or
inaccuracies that may appear in the document.