Method of detecting and classifying objects by means of radar
First Claim
1. An essentially aspect independent method of detecting and classifying known and unknown targets using radar, comprising the steps of:
- transmitting a wideband radar signal that includes wavelengths which coincide with characteristic overall lengths of targets to be detected and classified so as to obtain target signature information having limited aspect dependence;
receiving the radar signal as a returned signal;
detecting and determining characteristic frequencies in the returned signal as well as mutual time relations of said characteristic frequencies;
storing a plurality of values for characteristic frequencies and corresponding mutual time relations for a plurality of known targets in an analyzer; and
analyzing the characteristic frequencies and mutual time relations in the returned signal by comparing the returned signal characteristic frequencies and mutual time relations with the stored characteristic frequencies and mutual time relations values of known targets to identify the unknown target.
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Abstract
The present invention relates to a method of detecting and classifying objects using radar. The method means that a broadband radar signal comprising wavelengths that coincide with characteristic lengths of targets to be detected and classified is transmitted. Further, a returned echo signal is received and analysed, at which a signal analysis in a combined time-frequency domain is used, which comprises determining characteristic frequencies in the signal return and their mutual time relations. Finally, a comparison with the corresponding stored values of an analysis of possible targets is performed.
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Citations
16 Claims
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1. An essentially aspect independent method of detecting and classifying known and unknown targets using radar, comprising the steps of:
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transmitting a wideband radar signal that includes wavelengths which coincide with characteristic overall lengths of targets to be detected and classified so as to obtain target signature information having limited aspect dependence;
receiving the radar signal as a returned signal;
detecting and determining characteristic frequencies in the returned signal as well as mutual time relations of said characteristic frequencies;
storing a plurality of values for characteristic frequencies and corresponding mutual time relations for a plurality of known targets in an analyzer; and
analyzing the characteristic frequencies and mutual time relations in the returned signal by comparing the returned signal characteristic frequencies and mutual time relations with the stored characteristic frequencies and mutual time relations values of known targets to identify the unknown target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An essentially aspect-independent method of detecting and classifying a target using radar comprising:
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transmitting a wideband radar signal that includes wavelengths which coincide with characteristic lengths of targets to be detected and classified;
receiving a returned radar signal containing specular reflection from target boundary surfaces facing the transmitted radar signal, and surface waves induced on the boundary surfaces which circumscribe the target;
detecting frequencies and mutual time relations in the returned radar signal; and
analyzing and identifying the target by comparing the detected frequencies and mutual time relations with stored values for characteristic frequencies and corresponding mutual time relations for a plurality of known targets. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification