| 引用本文: | 叶浩欢,柳征,姜文利.基于子协方差阵加权的三星时差定位数据综合.[J].国防科技大学学报,2012,34(5):63-67,136.[点击复制] |
| YE Haohuan,LIU Zheng,JIANG Wenli.Data integration based on sub-covariance weighting for a three-satellite TDOA-based location system[J].Journal of National University of Defense Technology,2012,34(5):63-67,136[点击复制] |
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| 基于子协方差阵加权的三星时差定位数据综合 |
| 叶浩欢, 柳征, 姜文利 |
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(国防科技大学 电子科学与工程学院，湖南 长沙 410073)
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| 摘要: |
| 为提高三星时差定位系统的定位精度，需要将系统在不同时间得到的多个定位估计结果进行统计综合。本文提出了一种基于子协方差阵加权的定位数据综合算法。该算法根据单点定位精度分析结果，先利用定位误差协方差的二维子阵的逆矩阵作为权矩阵，通过加权最小二乘估计目标空间三维坐标位置中的其中两维，再利用WGS-84地球模型求解另一维坐标。仿真实验表明，相比已有算法，所提新算法可以明显提高定位精度。 |
| 关键词: 被动定位 三星 时差 多次观测 加权方法 WGS-84模型 |
| DOI： |
| 投稿日期：2012-03-02 |
| 基金项目:国家自然科学基金资助项目（61002026） |
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| Data integration based on sub-covariance weighting for a three-satellite TDOA-based location system |
| YE Haohuan, LIU Zheng, JIANG Wenli |
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(College of Electronic Science and Engineering, National University of Defense Technology，Changsha 410073，China)
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| Abstract: |
| To integrate multiple location estimates obtained at different time instants by a three-satellite TDOA-based passive location system, a method based on sub-covariance weighting is proposed. Based on the outcomes of the location precision analysis of a single estimate, the algorithm yields an integrated estimate of the spatial location through a two-step process: firstly, by using the inverse of the sub-covariance as the weighting matrix, it estimated two of the three coordinates through weighted least square (WLS); secondly, it calculated the last one coordinate by solving the WGS-84 ellipsoid model function of the earth. Simulations show that the proposed method, compared with the existing methods, can significantly increase the location precision. |
| Keywords: passive location three-satellite TDOA multiple observations weighting method WGS-84 model |
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