The satellite orbit parameters in the ephemeris and location of land emitter are studied.Universal mathematic models of TDOA and FDOA are deduced using geometric vector method.The TDOA and FDOA of two satellites which are selected from Globalstar and Inmarsat satellite communications systems are analyzed.The simulation results show that the proposed model is effective and universal,and it can be used for estimation and validation of TDOA and FDOA in source localization.%文章研究利用卫星星历中的轨道参数以及地面辐射源的经纬度和高程,采用几何矢量法,建立了对各种轨道卫星具有通用性的卫星接收信号TDOA/FDOA估计模型,分析了从典型卫星通信系统Globalstar和Inmarsat中选取的2颗卫星在接收辐射源信号时TDOA/FDOA变化情况。仿真结果表明,文中所建模型具有较好的适用性,为无源定位中TDOA/FDOA的估计结果提供了一种验证方法。
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