小基阵高精度时延估计方法研究  

On Improving Time Delay Estimation Precision of Small Size Array

作　　者：王昭[1] 李宏[1] 施坤林 赵俊渭[1] 

机构地区：[1]西北工业大学声学工程研究所,陕西西安710072 [2]兵器工业总公司212所,陕西西安710065

出　　处：《西北工业大学学报》2000年第1期142-146,共5页Journal of Northwestern Polytechnical University

基　　金：国防科技重点实验室基金;教育部博士点基金!97CJ0 3 0 1

摘　　要：根据声测被动定位对声学基阵提出的要求 ,给出了当基阵尺寸较小的情况下 ,影响声测被动定位精度的关键因素。同时分析了多种广义互相关时延估计方法的性能 ,并用实测的直升机声场数据进行了实验仿真研究。结果表明 ,采用广义互相关方法 ,能有效地提高小基阵声测被动定位的时延估计精度 ,其精度比常规方法高出 2倍以上。Aiming at improving the precision of acoustic passive localization by small size array, we first derived eqs. 1 through 3 to describe the relation between time delay and target location. Eqs.4 through 9 show the influence of distance between array elements, target range, and time delay estimation precision on localization precision. We then use measured helicopter sound field data to carry out simulation by the generalized cross correlation methods [2,3] . Table 1 gives the simulation results. It shows that generalized cross correlation methods (Roth、SCOT、PHAT、HB) can effectively decrease the mean square error in time delay estimation. At moderate signal to noise ratio (SNR=10 dB), mean square errors by the generalized cross correlation methods are less than half of that by cross correlation method.

关 键 词：声测被动定位 小基阵 时延估计 直升机 智能雷弹 

分 类 号：TN959.1[电子电信—信号与信息处理] TJ761.13[电子电信—信息与通信工程]