宽带多普勒技术中模糊速度处理方法改进  

An improvement method to the ambiguous velocity in broad-band Doppler technique

作　　者：马海涛[1] 彭东立[1] 王华亮[1] 许伟杰[1] 

机构地区：[1]中国科学院声学研究所东海研究站,上海200032

出　　处：《声学学报》2011年第2期226-230,共5页Acta Acustica

摘　　要：宽带多普勒剖面仪(BBADCP),利用复相关测频技术和伪随机码性质,测得各水层散射波的多普勒频率偏移,从而得到水流剖面图。复相关算法由于采用反正切函数,测频范围受到限制,会产生速度模糊问题。本文对接收信号作自相关运算,在以前研究者利用时延估计解决速度模糊的基础上,利用复相关测频结果与模糊边界的关系,设计了一种更准确更稳定的解模糊算法。Broad-band Acoustic Doppler Current Profiler（BBADCP） makes use of the complex correlation algorithm and the pseudo-random code technique to measure the frequency offset of the scatter of water-layers and a profiler of water current can be realized.The complex correlation algorithm makes use of the inverse tangent function,but a restricted frequency domain is obtained.Based on the previous research of time delay estimation,this paper utilizes the relationship of the result of complex correlation algorithm and the ambiguous boundary and design a more stable and more precise algorithm to solve the ambiguous problem.

关 键 词：多普勒技术 速度处理 模糊问题 宽带 测频技术 反正切函数 伪随机码 频率偏移 

分 类 号：TB51[理学—物理]