Accession Number : ADD014679

Title :   Phase Accumulator-Bearing Tracker.

Descriptive Note : Patent, Filed 4 Jun 84, patented 4 Sep 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Goldman, Warren A

Report Date : 04 Sep 1990

Pagination or Media Count : 5

Abstract : 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)

Descriptors :   *PASSIVE SONAR, *PATENTS, *ACOUSTIC TRACKING, ANGLES, ARRAYS, BANDPASS FILTERS, BANDWIDTH, BEARING(DIRECTION), ESTIMATES, LOW LEVEL, NARROWBAND, PHASE, SIGNAL TO NOISE RATIO, ACOUSTIC SIGNALS, SONAR TARGETS

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE