Abstract:

Because a monostatic sonar can only obtain the radial speed, and the bistatic one has lots of redundant information, a sonar system operating on them both complexly is put forward to obtain the twodimensional(2D) target speed vector. For this reason the characteristic of Doppler frequency shift in a bistatic sonar system is analyzed and is compared with the monostatic one. Two methods for calculating the 2D target speed vector are given by combining the performances of Doppler frequency shift characteristics obtained from both of monostatic and bistatic systems. Moreover, the measurement error of speed is also analyzed. Measurement result shows that the proposed methods are effective, and the measurement error depends on the sonar’s resolving power of frequency shift and the relative position between targets and source/receiver bases.