Abstract
In active sonar, continuous-wave (CW) pulses are used to evaluate the velocity of a target because of its high-resolution of velocity. Unfortunately, due to multipath interface in shallow water, the received CW signals are fluctuating. This phenomenon degrades the performance of velocity measurement. The interference structure of low frequency sound field in shallow water is relatively stable and the intensity striations are regular in range-frequency graph, which makes it possible to reduce the influence of amplitude fluctuations by reasonable frequency design. In this paper, we obtain the separations of striations caused by different modes interfering. According to the separations, appropriate frequencies of multi-frequency CW pulses were selected to compensate the fluctuations. The simulation and experimental results show that this method can mitigate the influence of frequency selective fading in shallow water channel.
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