SIGNALS FROM DISTRIBUTED TARGETS OF AUTODYNE SRR WITH PULSE AMPLITUDE MODULATION

Abstract

The mathematical model for description of signals of the autodyne short-range radar (ASRR) with pulse amplitude modulation (PAM) is developed. Peculiarities of signal formation obtained from the distributed target in the form of an ensemble of arbitrary number of point reflectors are considered. Signal calculations by the step method are performed for the case of two point reflectors on the target located on different distances from ASRR. Distinctive features of signals formed at reception of the first and further emissions reflected from the moving targets are determines. After sending of probing emission, the reception of first reflected emission from an ensemble of shining points is accompanied by formation of linear superposition of signals from the separate reflectors. Reception of further reflections causes an appearance of combinational signal interaction of separate reflectors. The character and magnitude of such an interaction is defined by the value of feedback parameter of ASRR, which depends on the value of the autodyne frequency deviation and delay time of reflected emission. Results of experimental investigations oa ASRR with PAM are obtained using of the oscillator module made on the 8mm-range Gunn diode and two imitators of the Doppler signal.