Government public beta and location jammer and spoofer testing
Government agencies have proposed and validated an enhanced method for geolocating GNSS jammers so that jammers and spoofers can be discovered and disabled.
Wideband jammers or jammers, whether intentional or not, are most effective at interfering with nearby GNSS users because they are frequency independent and cause persistent loss of GNSS signals to nearby GNSS users.
Examples of intentional wideband jammers use modulation schemes such as FM chirp (sometimes called swept continuous wave) and additive white Gaussian noise. In contrast, narrow-band jammers such as continuous wave are relatively frequency selective and may lead to intermittent GNSS operation. Therefore, the ability to identify and geolocate the presence of broadband GNSS jammers is essential, as they pose a greater danger to GNSS users.
The AOA of the RF transmit signal source. Typical passive GNSS jamming sensing uses a phased array network to infer two or more angles of arrival. In order to take full advantage of the wideband nature of the source signal, a cross-correlation method is required.
The cross-correlation of signals received between two remote stations will produce a distinct peak at the cross-correlation delay that is different from the arrival time of the corresponding source. Therefore, TDOA is another observation of the sensor station related to the geographic location of the broadband source signal. If there are three or more stations, a combination of two or more detected TDOA measurements can be used to geolocate the jammer gps location.
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