Satellite signal spoofing detection system

A method of detecting a spoofing signal, the method comprising:

• receiving primary signals from a primary antenna and secondary signals from at least one secondary antenna, wherein the primary antenna is mounted on a top side of a vehicle and the at least one secondary antenna is mounted on a bottom side of the vehicle;
• and
• comparing primary information from the primary signals and secondary information from the secondary signals in determining if a spoofing signal is present in one of the primary signals and the secondary signals, wherein the primary information and the secondary information includes a number of signal sources used in position computations along with protection limits and a number of visible signal sources determined by the primary signals received from different sources at the primary antenna and the secondary signals received from different sources at the at least one secondary antenna.

A method of detecting a spoofing signal, the method comprising:

• receiving primary signals from a primary antenna and secondary signals from at least one secondary antenna, wherein the primary antenna is mounted on a top side of a vehicle and the at least one secondary antenna is mounted on a bottom side of the vehicle;
• and
• comparing primary information from the primary signals and secondary information from the secondary signals in determining if a spoofing signal is present in one of the primary signals and the secondary signals, wherein the primary information and the secondary information includes a number of visible signal sources at the primary antenna and the at least one secondary antenna.