Digital beamforming for simultaneously mitigating weak and strong interference in a navigation system

A method for adaptive processing in a navigation system comprising:

• applying temporal filtering to each of a plurality of input streams to provide a plurality of filtered input streams;
• generating a covariance matrix representing the plurality of input streams;
• generating a plurality of correlation results, each representing one of the plurality of filtered input streams;
• and
• calculating a beam-forming weight for each input stream from the covariance matrix and the plurality of correlation results.

A adaptive electronic protection processing system for a global navigation satellite system (GNSS) threat mitigation comprising:

• a precorrelation characterization component configured to provide at least one parameter characterizing a plurality of received signals;
• a digital antenna electronics component configured to downconvert the received signal to an intermediate frequency, digitize the intermediate frequency signal into a stream of digital samples at an associated sampling rate, and downconvert the stream of digital samples to a baseband digital signal
• a temporal filter for each baseband digital signal configured to provide a temporal cancelation of emitters to mitigate narrow-band jamming;
• a correlator configured to provide a plurality of correlation results, each representing one of the plurality of baseband digital signals;
• a spatial weight computation component configured to determine an optimal set of digital beam-forming weights via an optimization process according to the at least one parameter;
• and
• a postcorrelation characterization component configured to determine at least one constraint on the optimization process according to the plurality of correlation results.