Radar altimeter nearest return tracking

Details Radar altimeter nearest return tracking Radar altimeter nearest return tracking

1981-12-14

1986-02-04

Cangialosi, Salvatore

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5FT, 343 5SA, 343 12A, G01S 1332

Patent

active

045689385

ABSTRACT:
An FMCW distance measuring device is disclosed which enables increased accuracy by detecting the nearest return. A portion of the transmitted wave in an FMCW altimeter is mixed with the received signal indicating distance to ground to produce a beat frequency between the transmitted wave and the received wave. The beat frequency is a spectrum of frequencies, the lowest of which indicates the nearest return in a target area. The beat frequency spectrum is coupled for sampling by an analog-to-digital converter and then coupled to an apparatus for performing a Fast Fourier Transform to isolate the nearest return. In an altimeter, the Fast Fourier Transform of the return spectrum enables the FMCW radar to have an accuracy approaching that of pulsed radars without the associated disadvantages.

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patent: 4389649 (1983-06-01), Parkhurst et al.
patent: 4435709 (1984-03-01), Kipp
patent: 4509049 (1985-04-01), Haendel et al.

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