Decorrelation tolerant coherent radio altimeter

Details Decorrelation tolerant coherent radio altimeter Decorrelation tolerant coherent radio altimeter

G - Physics

01

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343/85

G01S 7/28 (2006.01) G01S 13/10 (2006.01) G01S 13/26 (2006.01) G01S 13/32 (2006.01) G01S 13/88 (2006.01)

Patent

CA 1318013

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.

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