Method and apparatus for using signal doppler change to resolve

Details Method and apparatus for using signal doppler change to resolve Method and apparatus for using signal doppler change to resolve

1996-08-07

1998-01-13

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

342424, G01S 504

Patent

active

057084432

ABSTRACT:
Radar emitter carrier frequency or pulse time-of-arrival measurements are used to resolve the differential phase measurement ambiguities on a long baseline interferometer (LBI) used to passively locate the emitter. The LBI requires only two pulses to precisely measure the change in signal angle of arrival caused by observer motion relative to the emitter, whereas frequency Doppler needs tens of pulses, and time Doppler may need hundreds of pulses, to estimate the same change to the same accuracy. Therefore Doppler measurements are made only to the accuracy needed to estimate the angle change accurately enough to differentially resolve the LBI.

REFERENCES:
patent: 4734702 (1988-03-01), Kaplan
patent: 4975710 (1990-12-01), Baghdady
patent: 5343212 (1994-08-01), Rose et al.

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