GNSS Interference, Jamming, & Spoofing

Vulnerability analysis and mitigation

Jamming spoofing multipath and obscuration mitigation for GPS GNSS testing for government and defense

GNSS Interference, Jamming, & Spoofing

Vulnerability analysis and mitigation

GNSS Vulnerabilities Jamming Spoofing

GNSS Vulnerabilities: Interference

Despite their spread spectrum modulation, GPS satellite signals are vulnerable to interference because of their extremely low power (approximately -160 dBW), and real-world incidents that result in disruption to GNSS have been rapidly rising. Interference can be unintentional and naturally-occurring, such as atmospheric scintillation and solar effects—or deliberate, such as jamming or spoofing. The U.S. DHS report, Resilient PNT Conformance Framework, released December 16, 2020, outlines 4 levels of PNT resilience in the face of interference. Spirent Federal’s test methodologies and test plans can help map interference effects on MGUE (Military GPS User Equipment) to standards such as these. Customers can analyze equipment response and test mitigation techniques to increase the accuracy, resilience, and performance of their PNT systems.

Read about our latest interference testing innovations

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Stuart Smith, Senior Manager, Strategic Marketing, from Spirent Communications, gives a product demonstration of the GSS9000 wavefront simulator for Multi-Element CRPA testing. This video is a 5-minute preview; view the full 25-minute product demo here


MGUE developers and integrators should understand jamming risks so they can implement mitigation measures that ensure receivers are protected. Understanding receiver performance in a wide range of realistic jamming scenarios is an important part of that process, and simulation is essential to characterize and compare performance in repeatable conditions. There are multiple ways to simulate jamming with a Spirent simulator, such as the GSS7765 interference simulator and the embedded interference ground transmitter (GTx) for phase calibrated wavefront simulation.  The most recent interference waveform to be added to Spirent’s portfolio is the Blue Force Electronic Attack (BFEA).  Users also have the ability to introduce their own custom waveforms.

Read GNSS Jamming white paper

Paul Crampton and Roger Hart, senior engineers at Spirent Federal, introduce emulation techniques for spoofing threat analysis & mitigation. This video is a brief preview; view the full 11-minute product demo here


Signal spoofing is transmitting fake GNSS signals to force a receiver into reporting an inaccurate time and position. Spoofing incidents have increased rapidly, making spoofing a growing threat to mission-critical operations. An integral part of our focus at Spirent Federal is to stay ahead of the constantly-evolving threats to PNT data, of which spoofing is a particularly concerning example. To this end, Spirent has included the most sophisticated and advanced spoofing emulation capabilities inherent in the GSS9000 simulator. The Spoofing Feature is a native component of SimGEN that allows users to easily define spoofed constellations, spoofing transmitters, and spoofed vehicles. Spoofed vehicle trajectories are defined in the same way as true vehicle trajectories, leveraging the same GUIs and interfaces.

Learn the types of spoofing attacks

Ajay Vemuru, Director of PNT Simulation/Other Sensors at Spirent Communications, discusses multipath interference and Sim3D


Obscuration, as well as the reflection and diffraction of signals known as multipath, can be one of the main sources of error in a GNSS receiver. Multipath errors can vary from a few meters to hundreds of meters according to satellite geometry and the receiver environment. The characterization and study of multipath is complex but important, as its effects need to be compensated for in most positioning, navigation, or timing solutions. With this in mind, Spirent developed Sim3D, an innovative solution for advanced 3D environment modeling and real-time signal propagation simulation.

Read Understanding Multipath ebook

GPS Anti-jam and Alternative RF PNT webinar

GPS Anti-jam and the Latest in Sensor Fusion Testing

In this webinar, we will discuss the merger that formed Raytheon Technologies, the critical importance of GPS anti-jam solutions, new methods to interface non-GNSS sensors into a GNSS test suite, how precise time synchronization improves sensor use, and the latest in sensor fusion testing. Raytheon Intelligence & Space Join Chad Pillsbury and Ben Graham, senior […]

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GNSS Spoofing with Spirent Federal


How to evaluate the risks to safety-critical and liability-critical systems

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How to test the risks of jamming to safety-critical and liability-critical systems

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