SYSTEM AND METHOD FOR NARROWBAND PRE-DETECTION SIGNAL PROCESSING FOR PASSIVE COHERENT LOCATION APPLICATIONS

摘要

A system and method for narrowband pre-detection signal processing in passivecoherent location applications is disclosed. A receiving subsystem receives areference signal and a target signal from an uncontrolled transmitter. Thetarget signal is reflected from a target. The passive coherent location systemincludes subprocessors that perform pre-detection operations on the referenceand target signals. The functions include zero-doppler cancellation,quadrature demodulation, reference beam regeneration, coherent processinginterval selection, power spectral density estimation, cross ambiguityfunction formation, and the like. Within these operations, the referencesignal is filtered with respect to the target signal to form a first outputreference signal. The first output reference signal is combined with the firsttarget signal to form a first output target signal. The output target signalthen is used for subsequent passive coherent location processing operations.The filter is updated with respect to a difference between the target signaland a subsequent target signal. Further, two paths are used for correlationprocessing of the reference and target signals.