GNSS Simulation

As GPS receivers are built into more mission-critical devices for difficult application environments, and designed with the emerging capabilities of a multitude of GNSS constellations and augmentation systems, developers and manufacturers need better ways to guarantee performance. That’s where GPS signal generation comes in.

While the test engineer has a variety of choices for testing GPS-based position, navigation and timing functions of their integrated GPS receivers, simulation offers the most flexibility, compared to testing with over-the-air signals ("live sky"), or record and replay solutions. Having complete control over GPS signal generation is the only way to have confidence in your hardware and software’s ability to perform – under any condition.

To understand how a GPS simulator works, it is helpful to understand some of the details of GPS signal transmissions. The GPS constellation consists of at least 24 satellites, orbiting every 12 hours, broadcasting navigation data on different frequencies. GPS is just one of several global navigation satellite systems (GNSS) in operation, or soon to be in operation. Most navigation applications today use the GPS L1 frequency at the radio frequency 1575.42 MHz. Onto this carrier frequency, satellites transmit identification information and a navigation message that contains synchronized time, the satellite’s orbital data (ephemeris) and data on the expected positions of all the satellites in the constellation (almanac). It is from this data that receivers can accurately calculate its distance from several satellite signals at the same time to achieve its navigation solution through trilateration.

GSG Series GPS/GNSS Simulators

The GSG-5 and -6 series simulators are powerful yet affordable GPS/GNSS RF generators for the most comprehensive testing of navigation devices and systems.

Simulator Configurations

  • GSG-51: 1-channel GPS/GNSS L1 RF signal generator for manufacturing test
  • GSG-5: 4-, 8-, or 16-channel GPS/GNSS L1 RF signal generator for advanced testing
  • GSG-6: 32-, 48-, or 64-channel GPS/GNSS multi-frequency signal general for the most advanced systems

Advanced Multi-Simulator Systems

Advanced Multi-Simulator Systems

Spectracom simulators have unique synchronization capability to be utilized in advanced test systems and pseudolite-like infrastructure.

Advanced Configurations

  • Combining multiple RF outputs with hundreds of signals
  • Testing CRPA and other directional antenna systems
  • Generate live sky GPS signals in a GPS-denied environment

GPS/GNSS Vulnerability Test Systems

GNSS Vulnerability Test Systems

Achieve a full understanding of how a GPS navigation system reacts in a spoofing situation.

Laboratory or field testing scenarios

  • Spectracom GPS simulators are configured to fully control "real" versus "faked" signals
  • For those authorized for field testing, a transportable system can be integrated to a detection, tracking and RF transmission system

GPS/GNSS Application Packages