摘要
针对多星协同时差无源定位系统,研究了非合作多星协同定位地面目标问题。首先,揭示了非合作三星协同定位工作原理,并分析了它相比于合作三星协同定机制的优势。在此基础上,提出了一种基于网格搜索的时差累积定位方法,实现对地面目标的高精度定位。该方法的创新之处在于,一方面是理论上最优的定位方法,且不依赖非合作三星的构型,另一方面无需求解定位方程组,从而解决了传统的基于拟合思想的定位方法的不足。进一步,分析了定量地分析了目标运动速度对定位性能的影响。最后,目标静止与目标运动两种场景下,仿真结果验证了该方法的有效性以及该方法的性能优于传统的定位方法,并进一步表明越大的目标运动速度将导致定位精度下降。
The ground targets geometric localization problem is investigated via multi noncooperative satellites for difference-of-times based passive source localization systems.The principle of this noncooperative localization is first presented.Comparing with the localization system by using three cooperative satellites,the ad-vantages of this localization systems are analyzed.Based on this principle,a grid search and difference of times accumulation integrated localization method is developed.With the application of this method,target localization with high accuracy is achieved.One of the key features of this method is that it is independent of the noncooperative satellites’formation,and it is theoretically an optimal localization approach.Moreover,the implementation of the designed method does not need to solve the localization equations.Therefore,the drawbacks of the conventional fitting-based localization strategies can be addressed.In addition,the effect of the target’s moving velocity on the localization performance is quantitatively analyzed.Numerical simulation is finally carried out in case of two scenarios.It is verified that the proposed method can localize the targets on the ground with better accuracy than the conventional approaches.It is further demonstrated that faster velocity of the target will lead to inferior localization accuracy.
作者
樊简
赵硕
蔡文硕
王烁
Fan Jian;Zhao Shuo;Cai Wenshuo;Wang Shuo(School of Electronics and Information Engineering,Beihang University,Beijing 100011,China;DFH Satellite Co.,Ltd.,Beijing 100094,China;Beijing Institute of Spacecwt Systems Engineering,Beijing 100094,China;China Academy of Space Technology,Beijing 100094,China)
出处
《国外电子测量技术》
北大核心
2022年第3期56-62,共7页
Foreign Electronic Measurement Technology
关键词
目标定位
非合作多星
协同定位
时差
网格搜索
target localization
noncooperative satellites
cooperative localization
difference of times
grid search
