Enhanced Multistatic Active Sonar via Innovative Signal Processing.

摘要

Continuous active sonar (CAS) in the presence of strong direct blast is studied for the Doppler-tolerant linear frequency modulation waveform. A receiver design which is capable of detecting slowly moving, stationary, or tangentially moving targets, while simulatenously providing low false alarm rate is developed. This receiver uses an adpative beamformer to suppress the direct blast signal to a managable level, so that effective target detection with acceptable false alarm performance is achieved. In fact, the developed receiver is capable of detecting the target signal without false alarms caused by the direct blast using only a single-ping of received data. The performance of the system with either a DAS beamformer, or one of three Capon beamformer variants is examined.