Process and device for correlation for use in a doppler radar installation

Claim 1

A doppler radar device for target measurements comprising the combination of: a pseudo-random digital pulse generator delivering a series of pulses alternatively representative of 1 and 0 binary states; an oscillator under the control of said pulse generator to alternatively deliver signals at two different frequencies for radar transmission purposes; a first multiplier having two inputs to which are applied respectively said series of pulses and a delayed version thereof imparted with a predetermined delay corresponding to the distance zone to be surveyed by radar, and an output; a second multiplier having two inputs to which are applied respectively said radar transmission signals and radar receiver echo signals, and an output; a switch connected to said second multiplier output and monitored by said first multiplier output; a 1 channel and a 0 channel each comprising a filter, under the control of said switch to be alternatively connected therethrough to said second multiplier output, depending on the monitoring of said switch by said first multiplier output; and means for extracting from said channels an operational radar signal.