Accession Number : AD0777129

Title :   Detection of Weak Signals with Unknown Coherence Time.

Descriptive Note : Technical rept.,

Corporate Author : TECHNOLOGY SERVICE CORP SANTA MONICA CALIF

Personal Author(s) : Goldstein,Gene B.

Report Date : 27 MAR 1974

Pagination or Media Count : 55

Abstract : The problem of detecting a signal whose coherence time is short compared to the total time of observation is examined. Further, the signal's coherence time is regarded as unknown. The signal itself is assumed to have a constant amplitude, and its phase and frequency may change in an arbitrary fashion from one coherence interval to the next. Though no assumption is made regarding the signal-to-noise ratio per coherence interval, it is assumed that the integrated signal-to-noise ratio over the the total processing time is large enough for useful detection probabilities to result. This is to be distinguished from an assumption of large signal-to-noise per coherence interval, in which case there is little motivation to process the entire data record before detection. The structure of the maximum-likelihood detector for this signal in white, zero mean, Gaussian noise is derived and the detection performance is numerically evaluated for specific cases. (Author)

Descriptors :   *Information theory, *Signal processing, White noise, Estimates, Probability density functions

Subject Categories : Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE