Research On The Performance Of Virtual Panoramic Signal Level Communication Sonar

For small platform on water there is mobile,Marine environmental change and interference of cases still need to guarantee the quality of the communication needs,on the basis of communication sonar panorama simulation,research on communication sonar performance optimization,implementation platform since under the influence of the effect of noise and channel of multiplicity intersymbol interference suppression and coherent interference suppression function.The virtual panoramic signal-level communication sonar system was built to study the performance factors affecting the underwater acoustic communication sonar,provide a panoramic virtual platform for the performance comparison and analysis of the communication sonar,and test the practical application effect of the semi-physical experiment of the system through the pool experiment.Aiming at the requirement of reliable communication of communication sonar under the influence of platform self-noise,channel multipath effect and other communication interference,the optimization method of underwater acoustic communication system is studied.The platform self-interference is suppressed by zero constraint technology to ensure the reliability of communication transmission.The adaptive decision feedback equalization technology combined with virtual time reversal technology was used to suppress the inter-symbol interference,and the equalizer was further optimized.The bidirectional decision feedback equalizer was used to reduce the bit error rate of equalization and improve the reliability of communication system by using the performance difference between forward equalization and reverse equalization.In order to solve the problem of active and passive coherent interference in communication,from the perspective of array signal processing,blocking array preprocessing technology is used to suppress passive interference,matrix spatial filtering technology is used to suppress active interference,and stopband is set to suppress interference to achieve anti-coherent interference ability.At the same time,the feasibility of the system is verified by processing the experimental data in the South China Sea and the performance of the optimized equalizer is analyzed.Experimental results show that the performance of all kinds of equalizer is better when fractional interval is selected.Virtual time reversal technology is introduced to further reduce the ber of underwater acoustic communication and achieve the purpose of robust underwater acoustic communication.