Pulse radar appts. comprising accumulators - alternately fed with output signals of A=D converter, after which certain period represent orthogonally detected echo signal components

摘要

The radar is provided with a coherent transmitting and receiving unit for the transmission of radar pulses and the reception of echo signals. The signals are converted into signals of an intermediate frequency, fi, which may be shifted through a Doppler frequency, fd. The echo signals with frequency, fi + fd are fed to a detector for the coherent phase detection with a frequency fi + fc. The detected signals are fed to an analogue-to-digital converter which operates at a frequency of approximately, 4fc. The pulse radar comprises accumulators, alternately fed with the output signals of the analogue-to-digital converter each time for a given period. Subsequently, the output signals of the accumulators are representative of the orthogonally detected components of the echo signal. The I and Q components of the video signal or of a portion of the video signal are acquired through one single phase detector, requiring for each receiver only one slip ring, instead of two.