基于DOA和TDOI的主瓣扫描辐射源定位方法

发布时间：2018-06-28 16:22

本文选题：无源定位 + 机械扫描　；参考：《电子与信息学报》2017年12期

【摘要】：针对具有已知扫描周期特性的辐射源无源定位问题,该文提出一种基于主瓣到达角(DOA)和扫描截获时间差(TDOI)的联合定位体制。通过对其定位误差的克拉美-罗下限(CRLB)推导,给出了联合定位体制的性能与DOA和信号截获时间(TOI)观测量的等效测角噪声功率比的关系。为了利用非线性联合观测量确定扫描辐射源的位置,通过将TDOI观测量转换成等效DOA观测量,给出一种加权伪线性最小二乘(WPLS)定位方法;为消除观测矩阵相关噪声导致的WPLS估计偏差,提出了一种加权辅助变量(WIV)定位方法,算法复杂度约为WPLS算法的2倍。仿真结果表明,WIV方法的定位误差在辐射源单个扫描周期内即可达到CRLB,定位性能与极大似然(ML)定位方法相当;随着观测次数的增多,WIV方法可以渐近达到无偏估计。
[Abstract]:To solve the problem of passive location of emitter with known scanning period, a joint location scheme based on the principal lobe arrival angle (DOA) and scanning intercept time difference (TDOI) is proposed in this paper. The relationship between the performance of the joint positioning system and the equivalent angle-noise power ratio of DOA and TOI observations is given through the derivation of the Cramey-Row lower bound (CRLB) of the positioning error. A weighted pseudolinear least squares (WPLS) localization method is proposed by converting TDOI observations into equivalent DOA observations to determine the location of scanning emitter using nonlinear joint observations. In order to eliminate the WPLS estimation bias caused by the correlated noise of the observation matrix, a weighted auxiliary variable (WIV) localization method is proposed. The complexity of the algorithm is about twice that of the WPLS algorithm. The simulation results show that the location error of the WIV method can reach CRLBwithin a single scanning period of the emitter, and the localization performance is equivalent to that of the maximum likelihood (ML) method, and the WIV method can achieve asymptotic unbiased estimation with the increase of the number of observations.
【作者单位】：火箭军工程大学信息工程系;国防科学技术大学电子科学与工程学院;
【基金】：上海航天科技创新基金项目(SAST2015028)~~
【分类号】：TN95

【相似文献】