基于拖曳长线阵的水下目标模拟系统

水下目标模拟系统对于水下航行体试验与训练、舰艇水声对抗与安全防御等具有十分重要的意义。基于水下目标声学多亮点回波理论,给出了多亮点目标宽带回波信号模型。通过计算机仿真,验证了目标回波各重要特征和目标回波信号模型的有效性。基于拖曳长线阵和高速数字信号处理技术构建了水下目标模拟系统,根据目标回波信号模型综合模拟了水下分布式多亮点运动目标声散射特性,准确模拟了目标不同部位声学亮点的空间方位分布特征。分别对点源目标、真实大尺度目标、拖曳长线阵目标模拟系统进行了声纳目标识别试验,结果表明,拖曳长线阵目标模拟系统的目标特性明显不同于点源目标,而与实际大尺度目标一致。

Underwater Target Simulation System Based on Towed Long Line Array

Underwater target simulation system is not only essential to experiments and trainings of underwater vehicles,but also significant to acoustic countermeasure and torpedo defense of surface ships or submarines.Based on the acoustic highlights theory of underwater target echo,wideband signal models of multi-highlight target echo were proposed.Important characteristics of the target echo and the validity of the wideband signal models were verified by computer simulations.An underwater target simulation system was developed based on towed long line array and high speed digital signal processing techniques.According to the target echo wideband signal models,this system simulated the integrated acoustic scattering characteristics of actual distributed large scale and multi-highlight moving target.Especially,it effectively simulated the spatial bearing distribution characteristic of the target different parts and acoustic highlights.Sonar target recognition experiments were carried out respectively for spot target,actual large scale target and the proposed target simulation system with the same sonar.The experiment results show that the acoustic scattering characteristics of the proposed system using towed long line array is obviously different to spot target but strictly consistent with the actual target.