基于IR-UWB信号特征匹配的空间TDOA系统的设计及LOS环境下的误差分析

Design of Space TDOA System based on Feature Matching of IR-UWB Signals and Accuracy Analysis in LOS Environment

时差定位(Time Difference of Arrival,TDOA)是一种广泛应用的被动定位技术,具有定位精度高,组网能力强,系统鲁棒性强等特点。分析了时差定位系统的一项核心关键指标——定位精度,该指标对于空间飞行器的航迹等运行参数的设计与规划紧密相关,需要根据系统实际进行分析。针对基于冲激无线电-超宽带(Impulse Radio-Ultra Wideband,IR-UWB)信号特征匹配的TDOA系统,对其定位精度进行了研究与分析。对于在视距(Line of Sight,LOS)环境下的工程实现情况,归纳了对定位精度有关键影响的误差因素,并且分析了其与定位精度的数量关系,并对特定构型下的圆误差概率(Circular Error Probability,CEP)进行了数值仿真,仿真结果对于系统的设计具有指导作用。

TDOA(Time Difference of Arrival)is a widely used passive positioning technology with high precision,strong ability of collaborating and high robustness.Accuracy of this system is analyzed as an important indicator of ability of the system and a factor of parameters of space vehicle such as route plan and schedule.Therefore,precision should be analyzed according to the actual situation of the system.The design of TDOA system based on feature matching of IR-UWB(Impulse Radio-Ultra Wideband,IR-UWB)signals is proposed.Quantity relationship between error factors that have key influence in LOS(Line of Sight)environment and positioning accuracy has been analyzed.Numerical simulation about CEP(Circular Error Probability)is carried out under certain configurations.Results serve as guidance for system design.