Decorrelation tolerant coherent radar altimeter

Details Decorrelation tolerant coherent radar altimeter Decorrelation tolerant coherent radar altimeter

1987-04-20

1989-07-25

Tarcza, Thomas H.

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

Determining distance

Altimeter

342135, 342202, G01S 1308

Patent

active

048518522

ABSTRACT:
A pulsed coherent radar altimeter is described which employs a narrow band receiver and utilizes a novel digital coherent pulse generator. A coherent pulse radar transmits a pulse comprised of the sum of at least two phase related RF signals closely spaced in frequency. The phase shift due to platform motion and return surface irregularity of the return signal is approximately the same for each carrier. The receiver produces a signal representative of the difference of the two carriers which is substantially free of decorrelation effects, and which can be processed in a narrow band receiver to produce range information.

REFERENCES:
patent: 2436627 (1948-02-01), Blitz
patent: 2506818 (1950-05-01), Sziklai
patent: 3774206 (1973-11-01), Rauch
patent: 3855594 (1974-12-01), Botcherby
patent: 3889261 (1975-06-01), Sirven
patent: 3896434 (1975-07-01), Sirven
patent: 4389649 (1983-06-01), Parkhurst et al.

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