Patent ID: 11906633
Assignee: NOVATEL INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A computer implemented method comprising the steps of:
receiving a set of navigation system (NS) signals at a plurality of antennas;
for each NS signal of the set of NS signals, obtaining a carrier phase measurement and a carrier to noise density measurement;
performing double differencing on the obtained carrier phase measurements to generate double difference carrier phase measurements and the obtained carrier to noise density measurements to generate double difference carrier to noise density measurements;
determining whether each of the double difference carrier phase measurements exceeds a first predefined threshold and whether each of the double difference carrier to noise density measurements exceeds a second predefined threshold;
labeling each NS signal of the set of NS signals as authentic when a particular double difference carrier phase measurement associated with the NS signal exceeds the first predefined threshold and a particular double difference carrier to noise density measurement associated with the NS signal exceeds the second predefined threshold;
in response to at least a predefined number of NS signals of the set of NS signals being labeled as authentic, determining position using the set of NS signals;
calculating a residual value for each NS signal of the set of NS signals labeled as authentic and each signal of the set of NS signals that is unauthenticated; and
labeling an unauthenticated signal as authentic when an average of the residual values for the authentic signals is removed from the residual value for the unauthenticated signal to generate a remainder value that is not greater than a residual threshold.