Accession Number : ADD015982
Title : Radar Target Discrimination by Spectrum Analysis.
Descriptive Note : Patent, Filed 13 Nov 92, patented 3 Aug 93,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Ruth, Duane ; Morrison, Larry M
Report Date : 03 Aug 1993
Pagination or Media Count : 24
Abstract : A method for distinguishing between a target and clutter analyzes frequency components of returned wave energy to detect target energy characterized by being present in a narrow range of frequencies, by increasing in the range over time, or by remaining substantially in the range over time. The method utilizes time sequential spectra of the returned energy. The spectra may be signals from a plurality of band pass filters or may be a spectrogram. The energy in adjacent band pass signals and spectra frequencies are correlated to detect energy in a narrow range of frequencies. Differences in successive spectra are integrated to detect increasing energy in a range of frequencies. An energy peak detected in a narrow range by correlation is integrated to detect that the peak remains in the range. The method is adapted for use with a network having inputs receiving successive samples of the returned energy and having outputs individually connected to the inputs through multiplier elements providing selectable factors, a summing element, and a selectable and generally sigmoidal activation function.
Descriptors : *CLUTTER, *TARGET DISCRIMINATION, *RADAR TARGETS, *PATENTS, ACTIVATION, CORRELATION, ENERGY, FILTERS, FREQUENCY, FUNCTIONS, INPUT, NETWORKS, OUTPUT, SIGNALS, SPECTRA, TARGETS, TIME
Subject Categories : Target Direction, Range and Position Finding
Distribution Statement : APPROVED FOR PUBLIC RELEASE