Method and apparatus for joint identification and direction finding
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United States of America Patent
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Dec 2, 2003
Grant Date -
Oct 3, 2002
app pub date -
Feb 12, 2002
filing date -
Feb 12, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for tracking a target. A signal from the target is received using a directional antenna and is digitized to provide a time series of samples. The samples are transformed, preferably by a wavelet transform. A signature of the target is identified in some of the transformed samples and a direction to the target is determined from others of the transformed samples. Target identification and target direction determination are iterated, with the identification being based on the most recently determined direction, and with the direction determination being based on the most recent identification, until a termination criterion is satisfied. Using wavelet transforms gives the antenna an effective beamwidth twenty percent narrower than the antenna aperture.
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