DETECTION AND SOURCE LOCATION OF WEAK CYCLOSTATIONARY SIGNALS - SIMPLIFICATIONS OF THE MAXIMUM-LIKELIHOOD RECEIVER

The problem of dual-receiver interception of low-SNR signals, which in cludes detection of the presence of a particular signal type and locat ion of its source, is considered. In particular, source-location based on time-difference-of-arrival (TDOA) measurements is considered, and the low-SNR maximum-likelihood receiver for joint detection and TDOA e stimation is taken as a starting point. By explicitly revealing the wa y in which this receiver exploits the spectral correlation properties of the cyclostationary signal, several partial implementations with op timality properties of their own are proposed. These greatly simplifie d implementations, which require only a one-dimensional search over th e TDOA parameter, are shown by simulation to perform competitively wit h the relatively complicated maximum-likelihood receiver, which requir es a two- or three-dimensional search for PSK signals.