Bistatic Doppler underwater intrusion detection sonar

摘要: A bistatic, Doppler sonar that having a plurality of receiver channels det intrusion in an insonified water zone processes return signals discrete up and down frequencies to effect short long term averaging energy slope prior sampling comparison generate multiple bit binary word is periodically updated read out parallel form detection logic. The logic utilizes sets shift register memories comparators detect when rates occurrence energy, slope, stroke conditions exceed predetermined rates, levels coincidence gates combinations such will produce alarm initiating signal.