Location Algorithm and Error Analysis for Earth Object Using TDOA, FDOA by Dual-Satellite and Aided Height Information
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摘要: 卫星探测定位系统对地面辐射源目标定位时,一般利用TDOA(到达时间差)测量,而当辐射源与卫星之间存在相对运动时,也可以测量FDOA(到达频率差).当辐射源的高程已知时,可以利用WGS-84地球椭圆模型作为精确定位模型.据此提出了利用两颗低轨卫星的TDOA及FDOA测量对地面辐射源定位算法,并对定位的算法进行深入的研究,同时推导了定位误差的分布模型.Abstract: Determining the position of an object on Earth＇s surface has many applications, such as in navigation and in remote sensing. The location system generally consists of a number of spatially well separated receivers that capture the radiated or reflected signal from the object. The satellite positioning systems has the advantage of long-distance and wide coverage compared with ground positioning systems and airplane positioning systems. When satellite positioning systems locates an object on earth＇s surface, TDOA （Time Difference Of Arrival） measurements, but when there are relative motions between object and satellite, the FDOA （Frequency Difference Of Arrival） can also be measured. When the altitude from sea-level of object is known, WGS-84 ellipsoid earth model can be used as the precise location model. This paper puts forwards the location algorithm for emitter on Earth using the TDOA and FDOA measurements of two low-orbit satellite, and studies in detail this algorithm, at the same time provides the error distributions model of location accuracy.
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Key words:
- TDOA /
- FDOA /
- Dual-Satellite location /
- Aided height information /
- Error analysis
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