Phase measurement approaches for a multi-tier weak radio signal detection process with N simultaneous signals having continuous phase

This paper presents a generalization of Tsui´s phase measurement approach to detection of N-1 weak signals to situations in which the weak signals have a phase that is continuous at any point in time. Examples are provided for the situation in which N = 2 and for four cases in which φ2 takes on each of the values {0, Π/2, Π, -Π/2}. This approach provides the capability for accurate identification of zero crossings and extraction of signal parameters. The capability for N ≤ 4 simultaneous signals is desired for electronic warfare (EW) receivers.