Wideband sonar receiver and sonar signal processing algorithms
AssigneeTeledyne FLIR, LLC
InventorsPaul Stokes, Phil Webb
Life of this patent
Estimating the term…
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 signal receiver, comprising:
- a digital stage adapted to digitize samples of a received wideband signal to produce filtered samples of the received wideband signal;
- and
- a correlator adapted to correlate the filtered samples with replica samples to provide a correlated signal, wherein the correlator comprises a digital signal processor (DSP) configured to divide a frequency domain representation of the replica samples (FRS) by a frequency domain representation of the received wideband signal (FS) to provide a first filter response, to multiply a shaping filter response by a conjugate of the FRS to provide a second filter response, and to multiply the second filter response by the FS to provide a third filter response.
A method of processing a wideband signal, the method comprising:
- converting a received wideband signal into a frequency domain representation of the received wideband signal (FS);
- converting a replica sample of the received wideband signal into a frequency domain representation of the replica sample (FRS);
- in the frequency domain, dividing the FRS by the FS to obtain a first filter response;
- in the frequency domain, multiplying the first filter response by a conjugate of the FRS to obtain a second filter response;
- and
- in the frequency domain, multiplying the second filter response by the FS to obtain a third filter response.
A method of processing a wideband signal, the method comprising:
- filtering a received analog signal into a filtered analog signal;
- converting the filtered analog signal into a digital signal;
- and
- applying a shaping filter to the digital signal in the digital domain to produce a shaped signal, comprising:
- converting the digital signal into a frequency domain representation of the digital signal (FS);
- converting a replica sample of the digital signal into a frequency domain representation of the replica sample (FRS);
- in the frequency domain, dividing the FRS by the FS to obtain a shaping filter response;
- in the frequency domain, multiplying the shaping filter response by a conjugate of the FRS to obtain an intermediate shaping filter response;
- and
- in the frequency domain, multiplying the intermediate shaping filter response by the FS to obtain the shaped signal.
Dependencies are inferred from the claim text.