Wideband sonar receiver and sonar signal processing algorithms

摘要

A wideband sonar receiver is provided that includes: a selectable bandpass filter adapted to filter a received sonar signal to produce a filtered signal and a correlator adapted to correlate the baseband samples with baseband replica samples to provide a correlated signal. In addition, the wideband sonar receiver may include a shaping filter to shape unshaped received pulses. Finally, a variety of sonar processing algorithms are described with regard to reducing clutter and interference, target detection, and bottom detection.

主权项

1. A wideband sonar receiver, comprising:
a selectable bandpass filter adapted to filter a received sonar signal to produce a filtered signal; an analog-to-digital converter for converting a version of the filtered signal to provide digitized samples; a digital basebanding and decimation stage adapted to baseband and decimate the digitized samples to produce baseband samples of the received sonar signal; and a correlator adapted to correlate the baseband samples with shaped baseband replica samples, wherein the correlator comprises a digital signal processor (DSP) configured to divide a frequency-domain version of the shaped baseband replica samples (FSRS) by a frequency-domain version of the baseband samples (FS) to provide a shaping filter response, to multiply the shaping filter response by a conjugate of the FSRS to provide a combined correlation and shaping response, and to multiply the FS with the correlation and shaping response to produce a correlated and shaped signal.