Phase accumulator-bearing tracker

Details Phase accumulator-bearing tracker Phase accumulator-bearing tracker

1984-06-04

1990-09-04

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

G01S 380

Patent

active

049550039

ABSTRACT:
A passive sonar bearing tracker having spaced arrays wherein the target bing 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 narrowband 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 weighed according to the magnitude of the frequency signal at the associated very narrow band.

REFERENCES:
patent: 4333170 (1982-06-01), Mathews et al.

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