Communications – electrical: acoustic wave systems and devices – Echo systems – Speed determination
Patent
1981-02-06
1983-08-09
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Speed determination
343 8, 364728, 364824, 364862, 367100, G01S 1558
Patent
active
043982743
ABSTRACT:
The invention concerns a method and apparatus for detecting Doppler-shifted waveforms in electrical signals. A replica is derived from the waveform prior to Doppler shift and stored in a storage device as a non-uniform profile having progressively increasing distortion along its length. The replica storage device is connected non-uniformly to correlating means such that the correlated replica profile has a degree of uniform distortion varying with storage position simulating varying degrees of Doppler shift. The electrical signal is uniformly correlated with the replica while the replica storage position is varied. An output signal is generated indicating correlation variation. The electrical signal is repetitively sampled and a maximum correlation is detected when the waveform occurs in the electrical signal with a degree of Doppler shift matching that simmulated by the correlated replica. The invention also includes apparatus for performing the method.
REFERENCES:
patent: 3696414 (1972-10-01), Allen et al.
patent: 3798590 (1974-03-01), Jacobson et al.
patent: 3997973 (1976-12-01), Buss
patent: 4255795 (1981-03-01), Hechtenberg
Farley Richard A.
The Secretary of State for Defence in Her Britannic Majesty's Go
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