GPS/GNSS Simulation
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Essential Ingenuity at Work

Spectracom is a world leader in resilient PNT (Positioning, Navigation and Timing) technology to enable mission-critical applications, enhance operations and reduce risk for aerospace and defense and commercial markets. They are a global manufacturer of precision time and frequency instruments and network-centric equipment used in a wide range of industries.


In global navigation, ideas can literally change the world.


"At Spectracom, we are partial to the practical. We love unraveling right-now questions with can’t-fail answers. We believe in the power of resilient PNT.

And whether we manufacture around them or integrate them into larger solutions, our energy and enthusiasm are directed to the immediate, the necessary, the essential. Because the GNSS eco-system is so encompassing, any challenge, practically resolved, has the potential to transform human interaction."



GPS/GNSS Simulators



Our GPS/GNSS simulators are easy to use, scenario-based instruments that combine a powerful, feature-rich platform with industry-leading value and affordability for any requirement for GPS testing.

So, what is a GPS Simulator? our White Paper to Learn More



GPS/GNSS Simulators Comparison Chart:

Spectracom GPS/GNSS Simulator Comparison Chart


Spectracom GSG-51

Single-channel GPS/GNSS L1 RF Generator

  Spectracom GSG-51 GPS_GNSS Simulator
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The GSG-51 is a GNSS signal generator that emulates a single satellite signal.

The main application is a simple but very fast manufacturing test, to assure that the assembly is correct, that the antenna is properly connected, and that the receiver can receive and identify a satellite signal.

It provides a fast and cost-effective solution for production test of GNSS-receivers in e.g. mobile phones with integrated GNSS-receivers.

Thanks to the wide RF level range from –65 to –160 dBm, the sensitivity of all types of GNSS receivers can be verified with a minimum of delay.

The 60 dB of extra power from normal test scenarios allows for splitting the signal many times.

Spectracom GSG-5 Series

Multi-channel Advanced GNSS Simulator

  Spectracom GSG-5 GPS_GNSS Simulator
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The GSG-5 series is a GPS, GLONASS, Galileo, BeiDou, and QZSS constellation simulator that generates all commercial signals in the standard L1 band.

It offers the standard set of features for testing GNSS systems.

With a base of four channels, configurable and upgradable to 8, 16, or more signals, this configuration is the perfect fit for navigational fix and position testing, for in-line product testing or engineering and development.

Spectracom GSG-6 Series

Multi-Channel, Multi-Frequency Advanced GNSS Simulator

  Spectracom GSG-6 GPS_GNSS Simulator
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The GSG-6 Series family offers multiple frequency band operation, multiple GNSS constellation simulation, and expansion to many more channels.

Incorporating all of the features of the popular 5 Series family, the 6 Series line expands your capability to simulate all the new, emerging GNSS signals.

With a base of 32 channels, upgradable to 48, 64, or more, it provides navigational fix and position testing, for engineering and development testing.

The 6 Series simulator protects your investment by being upgradeable in the future to more frequency bands and channels (plug-in hardware upgrade) and more signal formats (firmware upgrade).

Spectracom GSG-8 Series

Advanced GNSS Simulator - Advanced GNSS Simulation, Made Easy

  Spectracom GSG-8 GPS_GNSS Simulator
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GSG-8 is the newest positioning, navigation, and timing test solution offered through Orolia’s GSG family of simulators. It was developed to deliver the highest standard of Global Navigation Satellite System (GNSS) signal testing and sensor simulation performance in an easy to use, upgradable and scalable platform.

GSG-8 features high-end performance with a 1000 Hz simulation iteration rate, high dynamics, real-time synchronization, and simulation of all-in-view satellite signals. Advanced GNSS jamming and spoofing options allow the creation of benign and threat scenarios required to meet the needs of mission-critical applications. GSG- 8 is ideal for any development or integration project that requires sophisticated simulation capabilities in any simulated environment from any point on earth, and beyond.

GSG-8 supports multi-constellation, multi-frequency GNSS simulation and advanced threat scenarios, including jamming, spoofing and repeater simulation. Powered by our industry-leading Skydel simulation engine, GSG-8 can be programmed to simulate operations with all current and future GNSS signals. The ability to simulate multiple synchronized trajectories through multiple instances of the Skydel simulation engine allows testing of complex GNSS systems.


Spectracom GSG StudioView Software

GPS/GNSS Test Scenario Builder Software for Windows®

  Spectracom GSG StudioView software  
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GSG StudioView™ offers an easy way to create, edit and back-up complex scenarios for a Spectracom GSG series multi-channel GPS/GNSS simulator.

GSG StudioView allows users to build and manage visual trajectories and supports the import and conversion of trajectory files from other software applications and devices such as Google Earth.

Play this video to see an example complex scenario in action Play icon.png
Simulation of a smartphone and navigation app being driven through a road tunnel with an Intelligent Repeater System.



Advanced Multi-Simulator Systems

GSG Series GPS simulators are exquisitly synchronized to accurately generate constellations of global navigation satellites, and other signals, through its single multi-channel output, which opens up more opportunity.

Spectracom GSG GNS Simulators stacked


The benefit of accurately timed signals is the ability to synchronize several units to construct advanced test systems and pseudolite-like infrastructure.

  • Multiple RF outputs can be combined to create rich test environments with hundreds of signals.
  • Create tests for controlled radiation pattern arrays by generating direction-specific signals.
  • Test resiliency against spoofing scenarios where one unit is simulating live sky and another is attempting a take-over of GPS navigation.
  • Generate live sky GPS signals to act as an intelligent repeater system for a GPS-denied environment. 


Capabilities for Synchronisation

For Advanced Test Systems

  • Each simulator's high quality crystal oscillator can be synchronized to a common precise 10 MHz reference clock via an external input.
  • A common trigger pulse synchronizes the start of the test scenarios across multiple units.

For Synchronization to Live Sky

  • A "Simulate Now" feature synchronizes to the exact date and time by an NTP server, and...
  • Downloads and uses the same satellite ephemeris data as being broadcast in the GPS message.
Spectracom GSG GNSS Simulators sync


GNSS Vulnerability Test System

Understanding the reaction of GPS-based navigation in various spoofing scenarios is the key to hardening the system against spoofing attacks.

The threats to GPS-based navigation systems are ever-increasing. The risk of intentional disruption of GPS signals is moving from simple jamming to a much higher-level of sophistication.

Spoofing— an attempt to deceive by broadcasting false GPS signals — can be devastating, leading to loss of assets or, worse, lives.

While testing the sensitivity to jamming is basic functionality of GPS simulators, measuring the effects of various spoofing scenarios requires a high degree of complexity.

Spectracom is at the forefront of testing the vulnerabilities of GPS-based navigation and now offers its capability as a GNSS Vulnerability Test System.


Download the Product Brief...

Spectracom GNSS Vulnerability Test System


Testing Resilience to GPS Spoofing Attacks video thumb


An Intelligent Repeater System

A solution for GPS location of people or assets in indoor/underground environments

An intelligent zone-based GPS repeater system offers a cost-effective positioning solution for GPS-denied locations and in particular road and rail tunnels.

It consists of one Spectracom GPS time server with access to an outdoor GPS antenna and a network connection to GPS simulators. In addition to synchronizing the simulator's date/time, the time server also acts an a RINEX server to provide the data about live constellation. Any number of GPS simulators are set to generate signals corresponding to a fixed known location so GPS devices continue to provide a position fix when cross live sky to GPS-denied boundaries.

Spectracom Intelligent Repeater System video thumb

Learn More...



GPS/GNSS Application Packages

  • GPS Sensor Simulation
  • GPS Testing with Recorded Signals
  • RTK-DGNSS Virtual Reference Station
  • Assisted GNSS Testing
  • Real-Time Trajectories
  • Testing GPS Time Transfer
  • M-Code Receiver Testing

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Antenna Coupler

GPSG-1000 Portable Satellite Simulator

VIAVI AvComM is pleased to add the new GPSG-1000 GPS/Galileo Portable Positional Simulator to its outstanding line of flightline test equipment. The GPSG-1000 is a low cost, multi-channel, WAAS capable satellite simulator that can be used in production, maintenance or installation testing.

Contact Us for more information...