Method of spectral analysis, FM/CW type radio altimeter with dig

Details Method of spectral analysis, FM/CW type radio altimeter with dig Method of spectral analysis, FM/CW type radio altimeter with dig

1997-07-03

1999-12-07

Pihulic, Daniel T.

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

Determining distance

Altimeter

G01S 1334

Patent

active

059991186

ABSTRACT:
A spectral analysis carried out on the beat signals obtained by the mixing of a transmission signal, the frequency of which is modulated in the form of recurrent sawteeth, with this same signal after it has been transmitted, reflected and then received. The spectral analysis is based on the computation of self-correlation coefficients enabling the definition of the spectral components. For this purpose, the coefficients are computed at each sawtooth and are combined with the coefficients determined with the most recent previous sawteeth to give so-called global coefficients, from which the spectral components sought are restituted in a conventional way. Application especially to altimeters for the measurement of small heights.

REFERENCES:
patent: 4636958 (1987-01-01), Hethuin et al.
patent: 4728957 (1988-03-01), Hethuin
patent: 4766436 (1988-08-01), Crepin et al.
patent: 4947354 (1990-08-01), Hethuin
patent: 5032840 (1991-07-01), Hethuin
patent: 5072223 (1991-12-01), Hethuin et al.
patent: 5458122 (1995-10-01), Hethuin

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