基于双星TDOA和主星DOA的空中动目标联合定位技术

A Hybrid Localization Technology for an Aerial Moving Target Based on TDOA of Dual-Satellite and DOA of Main Satellite

现有基于星载的空中动目标定位方法工程实现复杂度与代价过大,本文提出了一种应用于空中动目标定位的新型双星定位技术,联合双星到达时差信息(TDOA)和主星来波方向信息(DOA)可以获得目标的三维定位.通过矢量求解方法,建立了空中动目标定位的数学模型.同时,在考虑多种误差因素的前提下,建立了用于Monte Carlo分析的定位误差模型.最后,以空间站及其辅星作为应用场景进行了算例仿真.结果表明该技术能够实现空中动目标的地面航迹和三维位置的精确估计,可应用于空间站与卫星联合的空中动目标联合定位系统.

The existing localization methods for an aerial moving target based on satellites are too complex and costly to be used in practical applications. A new localization technology based on two satellites for an aerial moving target is proposed.By combining two localization parameters named time difference of arrival（ TDOA） between two satellites and direction of arrival（ DOA） from the main satellite,the three-dimensional locations of an aerial moving target can be achieved.The three-dimensional mathematical localization model for an aerial moving target is established with the vector solution method. Moreover,for Monte Carlo analysis,the localization error model is established in consideration of many error factors.Lastly,the proposed localization technology is used in the suppositional scene which is composed of space station and one small satellite,and the numerical simulation is carried out. The simulation results show that the proposed localization technology can realize accurate estimation of the ground track and the three-dimensional position for an aerial moving target.