摘要
基于Pattern时延编码体制,针对水下超短基线定位系统设计了呼叫信号的正、负调频时延编码结构,并提出利用二次互相关技术进行时延估计。该方法在一定程度上能够提高呼叫方的可检测信噪比,同时在复杂环境下对信道中包括直达波在内的多径信号能量进行累加,能够准确地完成峰值检测,进而达到提高时延估计精度的目的。海试实验结果表明二次相关法在不同信噪比条件下能有效地抑制界面反射产生的多径干扰。
Based on pattern time delay shift coding regime, the structure of positive and negative frequency modulation calling pulses of underwater ultra-short base line acoustic positioning system is given, and a second correlation method of time delay estimation is proposed in this paper. As the second correlation method improves the detectable sig- nal-to-noise ratio of calling end to certain extent, it could accumulate the energies of multipath reflections including the direct wave effectively in the complex underwater channel environment, so as to achieve the peak detection accurately and to improve the accuracy of time delay estimation. The sea trial results show that the second correlation method could suppress the multipath interference from interface reflections under different signal-to-noise ratios efficiently.
出处
《声学技术》
CSCD
2014年第3期189-192,共4页
Technical Acoustics
基金
国家自然科学基金(61372181)
国防预研项目(513220505)资助项目
关键词
二次互相关
Pattern时延编码
水声定位
the second correlation
pattern time delay shift coding
underwater acoustic positioning
