GNSS Simulator Enables Contested Navigation Training Without Over-the-Air Jamming

Force Effect has launched PARALLAX, a GNSS threat simulator designed to enable realistic jamming and spoofing training during live exercises without transmitting interference signals over the air.

GNSS interference presents an ongoing challenge in military operations, yet training against these threats is often restricted by regulatory approvals, airspace coordination and controls on emissions. PARALLAX addresses these limitations by allowing forces to experience simulated navigation disruption during exercises without radiating jamming or spoofing signals.

The system fits between a platform’s GNSS antenna and receiver, combining real satellite signals with controlled jamming or spoofing across any GNSS constellation. Compatible with any GNSS receiver without additional integration work, PARALLAX can be installed on vehicles, boats, ships and uncrewed systems, allowing operators to train with their existing equipment.

Exercise planners can create threat scenarios on a map, positioning virtual jammers and defining their power, waveform and activation schedules. Each unit uses its location to model the signal path to every jammer, including terrain effects. As platforms move through the exercise area, their navigation can degrade, drop out or be pulled off course. Two independent jamming channels allow a single unit to encounter more than one threat simultaneously.

Once a scenario is loaded, the units run automatically, while exercise staff can monitor and adjust them from a central workstation. Threat parameters, including waveform, frequency and power, can be changed during exercises, while an Application Programming Interface (API) supports integration with wider exercise management systems.

Josh Sims, Managing Director at Force Effect, said, “Every recent conflict has shown that if you depend on GNSS, someone will try to take it away from you. Most forces only find out how their kit and their people cope when it happens for real. PARALLAX lets them find out on exercise instead, with no spectrum clearances to chase and no risk of jamming anyone else.”

PARALLAX is now available to government, defence and other approved end users and is controlled under the UK Military List (ML11.b). Force Effect will demonstrate the system at I/ITSEC in Orlando, Florida (booth 1637), and the AOC International Symposium and Convention in Washington, DC (booth 1115), in December 2026.