Signal detection in a multiple time delay environment

A signal detection method is presented for a multipath stationary environment. The multipath transmission channel is modeled assuming a different transfer function from the source to each hydrophone of the receiving array and a low signal-to-noise ratio (SNR). Under the above framework a log-likelihood detector is developed and interpreted. The structure is conceptually equivalent to the cascade of a generalized beamformer and an energy detector. The decision about the presence or absence of an object is accomplished by comparing the output signal energy with a threshold