| 摘要: |
| 提出一种基于非线性最小二乘(NLS)的三星座时差定位
综合算法。该算法不使用WGS-84椭球模型作为定位约束条件，通过对卫星过顶前后的两组弱
观测数据进行综合、配对处理，实现对目标的精确定位。仿真结果表明，该方法不仅对弱观
测数据具有较好的定位精度，而且不受目标高程约束，当目标高程不确定时，仍具有稳健的
定位效果。 |
| 关键词: 星座 时差定位 极大似然估计 非线性最小二乘 |
| DOI：10.3969/j.issn.1001-893X. |
|
| 基金项目: |
|
| Integration Algorithm of Three-Satellite Constellation TDOA Location Based on NLS |
| LI Yue,LIU Zhen,WU Yu-jiang |
| (School of Mathematics and Statistics, Lanzhou University, Lanzhou 730000,Chin
a;National University of Defense Technology, Changsha 410073,China) |
| Abstract: |
| This paper presents an integration algor
ithm of three-satellite constellation TDOA location based on nonlinear least squ
are(NLS), which is not constrained by WGS-84 ellipsoid model. Through fusing and
matching with the two groups of weak observational data produced by the satelli
te when entering or leaving the reconnaissance region, this algorithm can obtain
precise location of the target. Simulation results show that the proposed algor
ithm not only has better location performance with weak observational data, but
also is relatively more insensitive to the target height. |
| Key words: constellation TDOA location maximum likelihood estimate(MLE) nonlinear least square(NLS) |
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