Radar echo signal processor - uses delays and correlations to eliminate undesired echoes and retain wanted target echoes

摘要

A signal processing system for a radar system in which the reflected signals comprising a sequence of wanted and unwanted echoes are fed in for the suppression of the unwanted signals and which contains a delay unit introducing successive delay steps corresponding to the repetition periods of the transmitted pulses, and with an algebraic addition unit so arranged that a signal reaching a first input terminal of the counter circuit occurs later in the signal mixture later than one which simultaneously reaches a second input via the delay line; between the delay line (32) and the counter (38) there is a mixing unit M2 which mixes delayed signals with signals identified as output signals from a correlator (45) to give a correction output signal at 48 MHz which is fed to the second connection to the counter (38), as well as a signal correlator (CR1) which receives delayed signals as a single set of input signals as a first input, and also output signals from the counter as a second set of input signals.