宽带波达方向估计的辅助粒子滤波算法  

Auxiliary Particle Filtering Algorithm for Direction of Arrival Estimation of Wideband Signal

作　　者：吴孙勇[1,2] 姚明明 薛秋条 蔡如华[1] Wu Sunyong;Yao Mingming;Xue Qiutiao;Cai Ruhua(Department of Computational Science and Mathematics,Guilin University of Electronic Technology,Guilin,Guangxi 541004,China;Guangxi Experiment Center of Information Science,Guilin,Guangxi 541004,China)

机构地区：[1]桂林电子科技大学数学与计算科学学院,广西桂林541004 [2]广西信息科学实验中心,广西桂林541004

出　　处：《信号处理》2019年第7期1275-1280,共6页Journal of Signal Processing

基　　金：国家自然科学基金(61561016);广西自然科学基金(2016GXNSFAA380073);广西密码学信息安全重点实验室研究课题项目(GCIS201611);广西高校数据分析与计算重点实验室开放基金项目

摘　　要：针对粒子滤波宽带波达方向估计中因采样粒子权值不稳定导致估计误差较大的问题,提出了基于辅助粒子滤波的宽带波达方向估计算法。该算法利用贝叶斯重要性采样算法,在权值大的粒子基础上引入辅助粒子变量,重新定义重要性采样分布函数。经过两次加权计算,进而改善粒子退化问题,并引导粒子向高似然区域移动,使粒子在真实状态周围分布更均匀,粒子权值比仅用重采样的粒子权值变化更稳定。仿真实验表明,该算法在均方根误差和检测概率性能上优于粒子滤波算法。In this paper,aiming at the problem of large estimation error caused by instability of sampling particle weight in wideband direction-of-arrival(DOA)estimation of particle filter,an algorithm based on auxiliary particle filter is proposed.In this algorithm,the importance sampling distribution function is redefined by introducing auxiliary particle variables to large weights particle.The two-weighted calculation makes the change of the particle weight ratio more stable and the sampling point more close to the true state.In the meantime,the problem of particle degeneracy is improved and the sampling particles are guided to the high likelihood region.Simulation results show that the performance of the proposed algorithm is better than standard particle filtering method in root mean square error and detection probability.

关 键 词：辅助粒子滤波 宽带信号 波达方向估计 阵列流形跟踪 

分 类 号：TN911.25[电子电信—通信与信息系统]