Patent
Adaptive tracking notch filter system
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TLDR
In this paper, a frequency variable notch filter is applied to a control input at which is applied a small amplitude AC dither signal to provide a DC error signal indicating the magnitude and direction in frequency misalignment.Abstract:
An automatic tracking notch filter system tracks a large-magnitude narrow band signal through frequency effectively eliminating it. A frequency variable notch filter is responsive to a control input at which is applied a small amplitude AC dither signal. The resulting fluctuation in frequency of the notch filter causes corresponding fluctuations in the magnitude of the notch filter output. The output signal is rectified and band pass filtered around the dither frequency before being demodulated with the dither signal to provide a DC error signal indicating the magnitude and direction in frequency of the filter misalignment. The error signal is integrated and input to the control input of the notch filter with the dither signal such that the notch filter tracks the narrow band signal in response to the feedback signal provided at its control input.read more
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References
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Journal ArticleDOI
Coherent Optical Adaptive Techniques
William B. Bridges,P. T. Brunner,S. P. Lazzara,T. A. Nussmeier,T. R. O’Meara,J. A. Sanguinet,W. P. Brown +6 more
TL;DR: The theory of multidither adaptive optical radar phased arrays is briefly reviewed as an introduction to the experimental results obtained with seven-element linear and three-element triangular array systems operating at 0.6328 microm.
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