Wideband sonar receiver and sonar signal processing algorithms
AssigneeFLIR Systems, Inc.
InventorsPaul Stokes, Phil Webb
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Abstract
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.
Claims20
A wideband sonar receiver, comprising:
- a digital basebanding and decimation stage adapted to baseband and decimate digitized samples of a received sonar signal 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.
A method of processing a received wideband sonar signal, the method comprising:
- digitizing a filtered wideband sonar signal to produce digitized samples;
- and
- correlating the digitized samples with shaped replica samples, wherein the correlating comprises dividing a frequency-domain version of the shaped replica samples (FSRS) by a frequency-domain version of the digitized samples (FS) to provide a shaping filter response, multiplying the shaping filter response by a conjugate of the FSRS to provide a combined correlation and shaping response, and multiplying the FS with the correlation and shaping response to produce a correlated and shaped signal.
A sonar system for shaping a received sonar signal according to a shaped replica pulse, comprising:
- a digital signal processor (DSP) configured to divide a frequency-domain version of the shaped replica pulse (FSRP) by a frequency-domain version of the received sonar signal (FS) to provide a shaping filter response, to multiply the shaping filter response by a conjugate of the FSRP 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.
A method, comprising:
- within a sonar system, dividing a frequency-domain version of a shaped replica pulse (FSRP) by a frequency-domain version of the received sonar signal (FS) to provide a shaping filter response;
- multiplying the shaping filter response by a conjugate of the FSRP to provide a combined correlation and shaping response;
- and
- multiplying the FS with the correlation and shaping response to produce a correlated and shaped signal.
Dependencies are inferred from the claim text.