Method of spectral analysis, in particular for radioaltimeter fm / cw type of treatment, 1984,

摘要

The invention relates to a method of spectral analysis, in particular for fm / cw radio altimeter type digital processing. & br / a spectral analysis is carried out on the beat signals obtained by mixing a transmission signal whose frequency is adjusted according to the saw teeth of recurrent, with this same signal after it has been emitted, and is reflected, then received. The spectral analysis is based on the calculation of the self-correlation coefficients making it possible to define the spectral components. For this purpose, the coefficients are calculated at each saw tooth and are combined with the coefficients determined with the saw teeth of the most recent previous to give the coefficients of said overall, from which are released, in conventional manner, the spectral components. & br / application, in particular, to the altimeters for measuring low heights.