Passive multipath target range and depth estimation system using variable depth sonar

摘要

The system includes a receiver device adapted to receive acoustic energy from such target and provide receiver signal. A receiver positioning device is adapted to move the receiver device from first to second depths. A processing device is coupled to the receiver device and adapted to process the receiver signals generated by the receiver at the first depth and at the second depth, and provide sonar signals indicative of the target's location. The sonar signals are indicative of estimates of the target's range from the receiver and its depth from the surface. The processing device comprises s device for approximating the acoustic propagation time differential between two possible acoustic propagation paths at the first and second depths.