时变长基线2维干涉仪测向方法  

Direction Finding Method for Two-dimension Interferometer Using the Time Varying Long Baseline

作　　者：张敏[1] 郭福成[1] 周一宇[1] 姚山峰 

机构地区：[1]国防科学技术大学电子科学与工程学院,长沙410073 [2]盲信号处理国防科技重点实验室,成都610041

出　　处：《电子与信息学报》2013年第12期2882-2888,共7页Journal of Electronics & Information Technology

基　　金：国防科技重点实验室基金(9140C860304);国家863计划项目(2011AA7072043)资助课题

摘　　要：针对现有多通道干涉仪测向系统复杂、解相位差模糊对基线布阵几何要求高等问题,该文提出一种基于时变长基线虚拟2维干涉仪的伪线性最小二乘(PLS)测向方法。该方法首先选取一组相位差得到多组角度初值,然后对每组初值采用PLS方法进行计算,最后选取最小代价函数对应的估计值作为最终的测向结果。推导了测向误差的克拉美-罗下限(CRLB)和该文方法的均方误差(MSE)的等价关系。该方法对干涉仪的几何构型无特殊要求,无需事先解相位差模糊。数字仿真表明,该方法运算量适中,测向精度可接近CRLB。Due to the issues in multichannel interferometer direction finding, such as system complexity and demanding geometry configuration requirement for ambiguity resolving, a Pseudo-linear Least Square （PLS） algorithm is proposed for virtual Two-Dimension （2D） interferometer using the time varying long baseline. It first obtains a set of initial values using a pair of measured phase differences, then applies PLS to each initial angle and finally picks out the estimate with the minimum cost function as the ultimate result. The equivalent relationship between Cramer-Rao Lower Bound （CRLB） and Mean Square Error （MSE） is also derived. The proposed method has no special requirement for the geometry configuration and no need of phase difference unwrapping. Simulation results show this method achieves moderate computation cost and the estimate precision can approach to the CRLB.

关 键 词：测向 干涉仪 最小二乘 相位差 

分 类 号：TN971[电子电信—信号与信息处理]