PASSIVE METHOD FOR ESTIMATING TARGET DATA OF A TARGET EMITTING TIME-CONTINUOUS WATER SOUND SIGNALS

摘要

The target water sound signals, e.g. propulsion noises, are received at a receiving location distant from the target in at least one target-locating selective receiving direction. From the received signal, the frequency spectrum is formed and characteristic Doppler echo frequencies are read out in a high-frequency spectral range. From these Doppler echo frequencies, the target data such as specific frequencies with a narrow width of frequency lines contained in the target signal, the speed and course of the target and range of the target from the receiving location are determined.