Communications: directive radio wave systems and devices (e.g. – Determining velocity – Combined with determining distance
Patent
1993-02-02
1994-01-04
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Determining velocity
Combined with determining distance
342116, G01S 1358
Patent
active
052764532
ABSTRACT:
A method for resolving range and doppler target ambiguities when the target has substantial range or has a high relative velocity in which a first signal is generated and a second signal is also generated which is coherent with the first signal but at a slightly different frequency such that there exists a difference in frequency between these two signals of .DELTA.f.sub.t. The first and second signals are converted into a dual-frequency pulsed signal, amplified, and the dual-frequency pulsed signal is transmitted towards a target. A reflected dual-frequency signal is received from the target, amplified, and changed to an intermediate dual-frequency signal. The intermediate dual-frequency signal is amplified, with extracting of a shifted difference frequency .DELTA.f.sub.r from the amplified intermediate dual-frequency signal done by a non-linear detector. The final step is generating two quadrature signals from the difference frequency .DELTA.f.sub.t and the shifted difference frequency .DELTA.f.sub.r and processing the two quadrature signals to determine range and doppler information of the target.
REFERENCES:
patent: 3742437 (1973-06-01), Thiele
patent: 3863253 (1975-01-01), Kiyoto et al.
patent: 4302758 (1981-11-01), Tomasi
patent: 5136298 (1992-08-01), Williams
Heymsfield Gerald M.
Miller Lee S.
Clohan, Jr. Paul S.
Marchant R. Dennis
Miller Guy M.
The United States of America as represented by the Administrator
Tubbesing T. H.
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