Patent ID: 11921223
Assignee: NOVATEL INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A receiver, comprising:
a first antenna and a second antenna configured to receive signals;
a processor configured to:
perform a channel distortion authentication procedure, wherein when performing the channel distortion authentication, the processor is further configured to:
measure a first double difference of a first pseudorange measurement of the signals;
determine whether a first value corresponds to the first double difference of the first pseudorange measurement exceeds a predefined pseudorange threshold; and
in response to determining that the first value exceeds the predefined pseudorange threshold, determine that the signals are authentic navigate signals; and
in response to determining that the first value does not exceed the predefined pseudorange threshold;
initiate an observation window that lasts a predefined amount of time after determining that the first value of the first double difference does not exceed the predefined pseudorange threshold.
determine that the signals are the authentic navigation signals if any one of a plurality of different new values, corresponding to a plurality of new double difference values obtained during the observation window, exceeds the predefined psuedorange threshold, and
determine that the signals are spoofing signals if all of the plurality of different new values, corresponding to the plurality of new double difference values obtained during the observation window, do not exceed the predefined pseudorange threshold.