Fixed-echo cancelling radio altimeter and method of operating sa

Details Fixed-echo cancelling radio altimeter and method of operating sa Fixed-echo cancelling radio altimeter and method of operating sa

1989-12-19

1991-09-03

Black, Thomas G.

Boots, shoes, and leggings

340970, 342122, G01S 1334

Patent

active

050460102

ABSTRACT:
A low altitude radio altimeter of the FM/CW type which transmits a sawtooth frequency wave and has a transmitting and a receiving aerial. A beat frequency signal Fb.sub.t between the transmitted and received waves is produced at the output of a mixer. The altimeter includes means for digitizing Fb.sub.t at the rate of n samples per sawtooth, a first memory (M1) to store n.times.k samples S.sub.j.sup.i (where i varies from 1 to k and j varies from 1 to n), a second memory (M2) to store n sums ##EQU1## first computing means (PR) for determining ##EQU2## representative of Fb.sub.4, for storage in a third memory (M3), and additional computing and storage means (PR, M4) producing difference signals Fb.sub.t -Fb.sub.f.

REFERENCES:
patent: 3889104 (1975-06-01), Smith
patent: 4633253 (1986-12-01), Stove et al.
patent: 4698635 (1987-10-01), Hilton et al.
patent: 4766436 (1988-08-01), Crepin et al.
patent: 4947354 (1990-08-01), Hethuin

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