Wa. Gardner et Cm. Spooner, DETECTION AND SOURCE LOCATION OF WEAK CYCLOSTATIONARY SIGNALS - SIMPLIFICATIONS OF THE MAXIMUM-LIKELIHOOD RECEIVER, IEEE transactions on communications, 41(6), 1993, pp. 905-916
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.