
Accession Number : ADA185912
Title : SignaltoNoise Ratio Requirements for HalfWave and FullWave Nonlinear Detectors with Arbitrary Power Laws, Sampling Rates, Input Spectra, and Filter Characteristics
Descriptive Note : Technical rept.
Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT
Personal Author(s) : Nuttall, Albert H
PDF Url : ADA185912
Report Date : 10 Jun 1986
Pagination or Media Count : 124
Abstract : The output signaltonoise ratio of a signal detection system consisting of a sampler, a nonlinear rectifier, and a lowpass filter is evaluated generally, for arbitrary halfwave or fullwave nuth law rectifiers, sampling rates, input spectra, input signaltonoise ratio, and filter characteristics. The usual assumption of a long averaging time, relative to the inverse bandwidth of the input spectrum, is not made, thereby affording an explanation of the anomalous behavior of a halfwave rectifier for lowQ input spectra. A pitfall of employing the long averaging time assumption is illustrated via numerical example. A simple recurrence for the halfwave and fullwave nuth law rectifier coefficients allows for a very fast and efficient highorder series evaluation of the output signaltonoise ration for any value of nu. For moderateorlargeQ input spectra, the possibility of using deliberate undersampling with no loss of performance is illustrated. The use of a halfwave rectifier generally requires a higher sampling rate than does a symmetric fullwave rectifier; also the performance is somewhat poorer for the halfwave rectifier, and in some cases, significantly so.
Descriptors : *DETECTORS, *FULL WAVE RECTIFIERS, *LOW PASS FILTERS, *NONLINEAR SYSTEMS, ANOMALIES, BANDWIDTH, BEHAVIOR, FILTERS, HIGH RATE, INPUT, INVERSION, LONG RANGE(TIME), LOSSES, MEAN, OUTPUT, RATES, RECTIFIERS, REQUIREMENTS, SAMPLING, SIGNAL TO NOISE RATIO, SIGNALS, SPECTRA, SYMMETRY
Subject Categories : Cybernetics
Miscellaneous Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE