摘要
针对空气中基于时延的任意阵列被动定向问题,提出了一种基于最小二乘法的统一模型,并对影响该模型定向精度的几种因素进行了深入的分析。由于可以用于任意结构阵形,该统一模型能够方便地分析阵元位置误差引起的定向误差,能够避免实际系统由于更换阵形而带来的较大的软件变化;并且,当实际阵列与设计模型存在较大误差时,可以方便地改变模型参数使其与实际的阵列匹配。对影响定向误差的各种因素的分析和计算机仿真,为确定和提高被动声定向的精度提供了有价值的参考。
Existing models for special configuration array in air can not, in our opinion, ensure accurate acoustic-passive direction estimation. We propose a new model for arbitrary array in air that, together with suitable mathematics and engineering implementation, can do so. Keeping in mind the relation between time delay and target direction, we employ least squares method to establish our arbitrary-array model. For the case of presence of errors in array element positions, we, unlike existing methods, can avoid modifying the software for direction estimation by simply altering some coefficients on the basis of easily performed measurements. In this paper, we analyze with our arbitrary-array model several factors, including biases in delay estimates and errors in array element positions, that have important effect on accuracy of direction estimation. Computer simulation results show that our new arbitrary-array model can indeed deal effectively with errors present in array element positions.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2004年第4期496-499,共4页
Journal of Northwestern Polytechnical University
关键词
声被动定向
误差分析
任意阵列
acoustic-passive direction estimation, arbitrary array, error analysis
