System for local area detection and alerting of global navigation satellite system (GNSS) spoofing

A control station for local area detection and alerting of global navigation satellite system (GNSS) spoofing (LDAS), the LDAS control station comprising:

• at least one receiver/transmitter associated with a surveyed true location, a target altitude, and a coverage volume, each receiver/transmitter configured to:
• receive a plurality of GNSS positioning signals from a plurality of navigational satellites;
• determine, based on the plurality of GNSS positioning signals, an absolute position of the receiver/transmitter;
• compare the determined absolute position to the surveyed true location of the receiver/transmitter;
• if a deviation of the determined absolute position from the surveyed true location is attributable to GNSS spoofing beyond a confidence bound, indicate a nonzero probability of GNSS spoofer presence within the coverage volume;
• and
• transmit at a regular time interval at least one LDAS update, each LDAS update indicative of:
• a zero probability of GNSS spoofer presence within the coverage volume;
• or
• if the nonzero probability has been indicated since the last LDAS update, the nonzero probability.

A method for local area detection and alerting of global navigation satellite system (GNSS) spoofing (LDAS), the method comprising:

• receiving, via at least two signal receivers associated with an LDAS receiver station, each signal receiver communicatively coupled to at least two receiver (Rx) antennas, each Rx antenna corresponding to a surveyed true location and to a distinct height, a plurality of GNSS positioning signals transmitted by a plurality of navigational satellites;
• determining, via each signal receiver and based on the one or more received positioning signals, an absolute position of each Rx antenna;
• determining, via each signal receiver, a probability of GNSS spoofer presence by comparing the determined absolute position of each Rx antenna to the corresponding surveyed true location;
• if the probability determined by at least one signal receiver is nonzero, notifying, via the receiver station, the control station of the nonzero probability;
• and
• transmitting, via the control station, at least one VHF data broadcast (VDB) transmission at a regular time interval, the at least one VDB transmission comprising one of:
• a zero probability of GNSS spoofer presence;
• or
• if at least one receiver station of the plurality of receiver stations has notified the control station of the nonzero probability within the most recent time interval, the nonzero probability of GNSS spoofer presence.