GPS vulnerability to radio frequency (RF) interference is well known. An inexpensive one-watt noise jammer can deny GPS availability at distances of many miles for some receiver types. For military applications, anti-jam (AJ) is primarily performed by controlled reception pattern antennas (CRPAs) and associated antenna electronics. However, jamming protection provided by CRPA is not scalable for small-platform applications with very low size weight and power (SWAP) requirements.

 

To fully utilize the potential of GPS/Inerital integration for AJ and weak signal recovery, QuNav and our transitioning partner, Northrop Grumman Mission Systems, have been developing deeply integrated GPS/INS navigation (DIGINAV) system. DIGINAV is based on three technological innovations: (i) deep integration with mutual GPS/INS aiding, (ii) high-sensitivity GPS baseband signal processing, and (iii) software-defined M-code GPS receiver with an open architecture compatible with other AJ anti-spoofing options, future signals and other potential sensor integrations.

 

Anti-jam capabilities stem from extremely long coherent integration (LCI) of received GPS signals (e.g., 1 second). Consistent carrier phase tracking was demonstrated at a 70 dB jamming-to-signal (J/S) interference level. DIGINAV is also capable of maintaining navigation capabilities at 75 dB J/S with graceful degradation in PNT performance.

 

To learn more, click here to download DIGINAV Slide Deck.

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