Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent
1995-04-24
1997-08-19
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
367124, 367127, 342146, G01S 380
Patent
active
056595204
ABSTRACT:
A short baseline navigation system employs the real-time estimation of the positions of multiple cooperative targets. Each target replies with a unique stepped frequency sequence signal that covers the usable frequency band. A processor operates on reply signals received by elements on the tracking platform and develops a coarse time-difference-of-arrival estimate using an algorithm derived herein. The processor also estimates the Doppler shift of received signals, and determines a time-window (or gating) that eliminates the portions of the received signals corrupted by multipath interference. The relative phase differences between the received signals are then used in conjunction with the coarse time-difference-of-arrival estimates for a precise direction-of-arrival estimation.
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Geyer et al., "Acoustic Beacon-Aided Navigation in the Deep Ocean", Conf. IEEE 1978 Position Location and Navigation Symposium, San Diego, Ca., pp. 225-230 Nov. 1978.
Cyr Reginald John
Douglas Bretton Lee
Loggins, Jr. Chester DeWitt
Norris, Jr. Donald Owen
Wapner Michael Paul
Lobo Ian J.
Sonatech, Inc.
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