Pulsed doppler radar station with variable pulse frequency - has digital filter with one shift register for scanning sample processing

摘要

The digital filter also suppresses permanent echoes, and its characteristic follows changes of pulse repetition frequency. Signals in the shift register (SRG) are at first processed at the timing frequency (fs1) corresponding to the shortest period of the higher pulse repetition frequency, irrespective of the actual pulse frequency. When operating at lower pulse repetition frequencies, supply of input signals and/or further processing of echo signals is blocked during remaining time due to increased period duration. The first time region (T1) is at least equal to the period time of the highest pulse frequency (fp1).