M-COSTAS复合编码连续主动声呐信号研究  

Study on M-COSTAS Novel Coded Multi-modulation Continuous Active Sonar Signal

作　　者：吴迪[1] 周泽民[1] 曾新吾[1] 

机构地区：[1]国防科学技术大学海洋科学与工程研究院,湖南长沙410000

出　　处：《信号处理》2016年第10期1187-1193,共7页Journal of Signal Processing

基　　金：校科研计划资助项目(JC15-11-01)

摘　　要：连续主动声呐利用连续发射的声信号进行目标探测,相比于脉冲主动声呐具有可连续跟踪、时间增益更高等优势。连续主动声呐技术研究的一个重要内容是发射信号设计,本文在M序列和COSTAS圆序列的基础上提出了一种复合连续循环编码信号(M-COSTAS)。仿真结果表明,该信号可以得到近似于理想"图钉状"的距离/速度输出结果,并可利用COSTAS圆序列的循环特性实现较高的目标重访率(Target Revisit Rate)。与相同时宽带宽积的LFM-COSTAS信号相比,M-COSTAS在测距时可实现更低的旁瓣;与相同相位编码宽度和时宽的M序列编码信号相比,M-COSTAS可实现更高的距离/速度分辨力;此外,M-COSTAS的测距性能受M序列影响,M序列越长,距离向的旁瓣输出越低,且距离分辨力越高。By detecting target with continuous transmitting signals, continuous active sonar possess the advantages of tracing target continuously and higher time gain as compared to pulsed active sonar. An important aspect of continuous active sonar technology is transmitting signal design. Based on M sequence and circular COSTAS sequence, this paper proposed a novel coded multi-modulation signal （M-COSTAS）, which got a nearly ideal ＇thumbtack＇ range/velocity output as well as a good Target Revisit Rate by using the cyclicity of circular COSTAS sequence. Compared with LFM-COSTAS of the same time-bandwidth, M-COSTAS gets a lower sidelobe in ranging; compared with M sequence coding signal of the same phase coding width and time width, M-COSTAS get a higher range/velocity resolution. On the other hand, the length of M se- quence has closely influence on the ranging performance of M-COSTAS, the longer length of M sequence, the lower side- lobe in ranging and the higher range resolution.

关 键 词：连续主动声呐 M序列 COSTAS圆序列 

分 类 号：TB566[交通运输工程—水声工程]