Patent
Adaptive matched filter
Hans-Peter Schmid,Richard S. Schlunt +1 more
- 10 Dec 1987
42
TL;DR: In this article, a matched filter output characteristics for known signals embedded in noise signals that have varying noise power distributions are derived by Fourier transforming the applied signals and estimating the noise power spectral density.
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Abstract: An apparatus provides matched filter output characteristics for known signals embedded in noise signals that have varying noise power distributions. The system correlates applied signals with a manipulated version of the applied signals in an analog-to-analog correlator. The manipulated signals are derived by Fourier transforming the applied signals and estimating the noise power spectral density. A filter transfer function is then calculated using the noise power estimates and stored information related to the characteristics of the known signal. The transfer function is then inverse Fourier transformed to provide a filter impulse response characteristic which is correlated with the applied signals. A method of processing applied signals to provide for an enhanced signal-to-noise ratio for varying noise power distributions is also disclosed.
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Citations
Mutual information and minimum mean-square error in Gaussian channels
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References
Patent
Spectrum analyzer using digital filters
Joseph H. Flink,John Bertrand +1 more
- 03 Dec 1976
TL;DR: A spectrum analyzer using digital filters for providing third octave spectrum analysis comprises means for breaking up input information into a plurality of digital data blocks, each block being of a given time duration and being within respective frequency ranges as mentioned in this paper.
55
Patent
Adaptive low pass filter
Ben H. Cantrell
- 25 Jul 1974
TL;DR: In this article, an adaptive low-pass recursive filter adaptively changes its bandwidth filtering characteristics in accordance with the bandwidth of the incoming signal, which results in an input signal w(k) changed into output signal x(k), in according with the equation where k is a sampling interval and a is the adaptive value representing ratio of known noise power to average error between the filter input and output.
54
Patent
Hybrid analog and digital comb filter for clutter cancellation
Wayne L Weigel
- 16 Jan 1974
TL;DR: In this paper, a comb filter operative as a clutter canceller in a radar system is implemented as a hybrid analog and digital system, and provides a digital output signal from an analog input, radar beam return signal.
46
Patent
ARMA filter and method for designing the same
Daniel Graupe,A.A. Beex,G. Donald Causey +2 more
- 18 Nov 1977
TL;DR: In this paper, a near minimum order ARMA type recursive filter with guaranteed stability and convergence is provided together with a method for obtaining the parameters of such filter, where the amplitude/frequency response of the filter approximates an arbitrarily selected frequency spectrum of amplitude, and the phase response approximates a substantially linear function of frequency with an arbitrary selected slope.
45
Patent
Digital correlation system having an adjustable impulse generator
Cabell N Pryor
- 25 Apr 1963
40