Radar target discrimination by spectrum analysis
First Claim
1. A method for discriminating between target wave energy and clutter wave energy, said target energy and said clutter energy being present in doppler frequencies of combined wave energy, and said target energy being characterized in relation to said clutter energy by at least one of the following criteria:
- a first criterion that said target energy is present in a narrow range of said frequencies of possible said doppler frequencies;
a second criterion that said target energy in said range increases over time; and
a third criterion that said target energy remains substantially in said range over time,the method comprising;
receiving said combined energy;
generating time sequential frequency components of said combined wave energy; and
analyzing said time sequential frequency components for frequencies corresponding to at least one of said criteria.
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Accused Products
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.
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Citations
11 Claims
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1. A method for discriminating between target wave energy and clutter wave energy, said target energy and said clutter energy being present in doppler frequencies of combined wave energy, and said target energy being characterized in relation to said clutter energy by at least one of the following criteria:
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a first criterion that said target energy is present in a narrow range of said frequencies of possible said doppler frequencies; a second criterion that said target energy in said range increases over time; and a third criterion that said target energy remains substantially in said range over time, the method comprising; receiving said combined energy; generating time sequential frequency components of said combined wave energy; and analyzing said time sequential frequency components for frequencies corresponding to at least one of said criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification