Phase Accumulator-Bearing Tracker.
Patent, Filed 4 Jun 84, patented 4 Sep 90,
DEPARTMENT OF THE NAVY WASHINGTON DC
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This patent discloses passive sonar bearing tracker having spaced arrays wherein the target bearing is a function of the electrical phase angle of the signal between the arrays. Confidence in the bearing estimate is increased in spite of the relatively narrow bandwidth of the signal and a low signal-to-noise ratio by sequentially bandpass frequency filtering each very narrow component of the narrow-band signal, computing the phase difference between respective filter pairs, accumulating the phase differences over a selected time period and displaying the phase difference calibrated as a bearing. In a second embodiment the individual differences are weighted according to the magnitude of the frequency signal at the associated very narrow band. Keywords Patents. jhd
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