Analysis on the Key Technology of Integrated Underwater Detection and Communication

The integrated technology combined with underwater acoustic communication and underwater detection possesses the advantages of reducing platform volume and power consumption, and enhancing concealment. However, the development of this technology is restricted by the physical characteristics, acoustic characteristics and underwater acoustic environment of a sonar. In this paper, an integrated detection and communication technology based on communication signals under the sharing system is researched by means of the existing radar communication integration technology, underwater acoustic communication and detection technology. The detection and communication performances of the commonly used underwater acoustic communication modulation mode are analyzed, and the modulation modes suitable for underwater shared waveforms are selected. Aiming at the single base operation mode, a multi-level self-interference cancellation method and a method for estimating and detecting target based on the characteristics of communication signal are proposed, and a emiting leakage analog canceller is designed. Aiming at the bistatic operation mode, a spatial matrix filter is used to eliminate the direct waves, the relationship among signal-to-noise ratio(SNR), bit error rate(BER) and detection performance are analyzed, and the transmitted signal and echo wave which are obtained by direct wave are matched for filtering, so the performance of target parameter estimation and detection is improved.