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US4243935A Expired / Lapsed US ⏱️ 0.0 years remaining

Adaptive detector

Assignee: United States Department of the Navy
•
Filing: 1979-05-18
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Granted: 1981-01-06
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Expires: 1999-05-18
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Abstract

Abstract An adaptive detector comprises an adaptive linear prediction filter (ALPF)nd a detection processor. The adaptive filter comprises an input filter, adapted to receive an input signal x(k) and delay it by a time Δ. An L-point, or L-tap, adaptive filter has an input connected to the output of the input filter, a signal r(k) appearing at the output of the filter. A means for summing has two inputs, one for receiving the signal x(k) and the other for receiving an inverted signal from the adaptive filter, the output of the summer being an error signal ε(k). A feedback amplifier, whose input is connected to the output of the summer, takes a portion 2μ, of the output signal ε(k) and feeds it back to the adaptive filter, thereby modifying the tap weights of the adaptive filter. The detection processor comprises a circuit, whose input is connected to the output of the adaptive filter, to receive the signal r(k), for performing a K-point discrete Fourier transform (DFT) on the signal r(k). A spectral analyzer, whose input is connected to the output of the DFT circuit, performs a spectral analysis on the output signal.

Inventors

  • 👤 John M. McCool
  • 👤 Bernard Widrow
  • 👤 Robert H. Hearn
  • 👤 James R. Zeidler
  • 👤 Douglas M. Chabries
  • 👤 Randall H. Moore

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 10:22
CPC Classifications
H; H03; H03H; H03H21/00; G; G01; G01R; G01R23/00; G01R23/16; G01R23/165; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/292; G10; G10L; G10L21/00; G10L21/02; G10L21/0208; Y; Y10; Y10S; Y10S367/00; Y10S367/901

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 193 words
An adaptive detector comprising: an adaptive linear prediction filter (ALPF), which comprises; an input delay line, adapted to receive an input signal x(k) and delay it by a time Δ; an L-point, that is, L-tap, adaptive filter, having an input connected to the output of the input delay line, at the output of which appears a signal r(k); a means for summing, having two inputs, one for receiving the signal x(k) and the other for receiving an inverted signal from the adaptive filter, the output of the summing means being an error signal ε(k); feedback means, whose input is connected to the output of the summing means, for taking a portion, 2μ, of the output signal ε(k) and feeding it back to the adaptive filter, thereby modifying the tap weights: the adaptive detector further comprising a detection processor which comprises: means, whose input is connected to the output of the adaptive filter, to receive the signal r(k), for performing a K-point discrete Fourier transform (DFT) on r(k); and means, whose input is connected to the output of the DFT means, for performing a spectral analysis on the output signal of the DFT means.
Claim 2
Dependent Claim 193 words
An adaptive detector comprising: an adaptive linear prediction filter (ALPF), which comprises; an input delay line, adapted to receive an input signal x(k) and delay it by a time Δ; an L-point, that is, L-tap, adaptive filter, having an input connected to the output of the input delay line, at the output of which appears a signal r(k); a means for summing, having two inputs, one for receiving the signal x(k) and the other for receiving an inverted signal from the adaptive filter, the output of the summing means being an error signal ε(k); feedback means, whose input is connected to the output of the summing means, for taking a portion, 2μ, of the output signal ε(k) and feeding it back to the adaptive filter, thereby modifying the tap weights: the adaptive detector further comprising a detection processor which comprises: means, whose input is connected to the output of the adaptive filter, to receive the signal r(k), for performing a K-point discrete Fourier transform (DFT) on r(k); and means, whose input is connected to the output of the DFT means, for performing a spectral analysis on the output signal of the DFT means.
Claim 3
Dependent Claim 57 words
The adaptive detector according to claim 1, wherein the spectral analysis means comprises: means, whose input is connected to the output of the DFT means, for taking the magnitude squared of each of the transform values; and a means, whose input is connected to the output of the magnitude square means, for integrating the magnitude squared values.
Claim 4
Dependent Claim 51 words
The adaptive detector according to claim 1, further comprising: means, whose input is connected to the output of the spectrum analyzer, and having two outputs, for detecting at one output those signals which exceed a certain threshold, and those signals which do not exceed a predetermined threshold at the other output.
Claim 5
Dependent Claim 50 words
The adaptive detector according to claim 2, further comprising means, whose input is connected to the output of the integrator, and having two outputs, for detecting at one output those signals which exceed a certain threshold, and those signals which do not exceed a predetermined threshold at the other output.

References Cited (Backward Citations)

US3636333A Cited
US3702393A Cited
US3792245A Cited
US3875500A Cited
US4080661A Cited
US4093989A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-01-06 1984-07-07 1985-01-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-01-06 1988-07-07 1989-01-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-01-06 1992-07-07 1993-01-06 $7700.00 Window Closed / Lapsed

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