一种新的基于TDOA与GROA的无源定位算法  

A novel solution for passive source localization algorithm using TDOA and GROA measurements

作　　者：杜彦伸 魏平[1] 张花国[1] 

机构地区：[1]电子科技大学电子工程学院,成都611731

出　　处：《航空学报》2015年第9期3034-3040,共7页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(61201282)~~

摘　　要：针对基于到达时间差(TDOA)与到达增益比(GROA)的辐射源无源定位问题,提出了一种新的定位算法。首先通过引入一个中间变量,根据TDOA和GROA测量模型,构造一个约束加权最小二乘(CWLS)估计。由于这个CWLS问题是非凸的优化问题,现有的方法不能很好地求解。为此,提出了一种有效的方法可以求解到其全局最优解。最后,所提算法被推广到观测站存在自定位误差时的定位求解。计算机仿真结果验证了所提算法能够获得优于传统两步加权最小二乘法(2WLS)的定位性能,能够在更大的噪声条件下达到克拉美罗下界(CRLB)。This paper propose a novel method for passive source localization based on time differences of arrival （TDOA） and gain ratios of arrival （GROA） measurements. By introducing an intermediate variable into the TDOA and GROA measurement models, a constrained weighted least squares （OWLS） estimator is presented. Due to the nonconvex feature of the OWLS problem, the existing methods cannot perform very well. To handle this difficulty, an efficient method is proposed to find its global solution. Moreover, the proposed method is extended to solve the localization problem with sensor position errors. Simulation results corroborate that the proposed method outperforms the two-step weighted least squares method and can attain the Oramer-Rao lower bound （ORLB） at higher noise levels.

关 键 词：无源定位 到达时间差 到达增益比 约束加权最小二乘 自定位误差 

分 类 号：V556[航空宇航科学与技术—人机与环境工程] TN971[电子电信—信号与信息处理]