Patent ID: 6255984
Filing Date: 2001-07-03
Classification: G01S

Abstract:
A sensor system comprising:a signal source that generates a frequency-modulated (FM) signal that propagates in the manner of a wave,a transceiver and a mixer, wherein said mixer mixes a signal coming from said transceiver with said FM signal, into a measuring signal,a delay circuit, which chronologically delays said FM signal and mixes it with said FM signal, for purposes of generating a reference signal,a detector circuit, which defines definite phases of said reference signal and which comprises two comparators which are arranged so that one comparator can be actuated with said reference signal, and the other comparator can be actuated with said reference signal shifted 180.degree. in phase, anda measuring signal detector circuit for detecting said measuring signal at the instants of said definite phases and which determine a correction therefrom, with which said correction the modulation of said signal source is linearized.