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中文摘要：
连线相位干涉测量CEI（connected—element interferometry）在同一波束内接收GEO的两共位卫星的下行信号进行互相关计算，直接获取每个卫星信号到达基线两端天线的相位差，再组成差分观测量以进一步削弱公共系统误差项。分析了差分CEI的相对轨道确定原理，讨论了相位整周模糊度的计算方法和精度，指出渐次拉长基线的方法能够同时保证整周模糊度计算值的可靠性和相对轨道滤波的精度。仿真结果初步表明，仅利用差分CEI技术可以进行共位卫星的相对轨道监视。
英文摘要：
CEI can receive within the same beam the downlink signals two receivers of a baseline simultaneously. By doing the cross-correlation transmitted from two co-located GEOs at for each GEO, the precise CEI differ- enced phase can be obtained. And then the differential CEI measurement of the two GEOs can be constructed to cancel major common errors. The principle of relative orbit determination is analyzed. The method to solve un- known phase ambiguity and its precision are investigated. It is pointed out that the strategy of enlarging the length of baseline gradually can ensure the reliability of computed phase ambiguity as well as the filter accuracy of relative orbit. EKF simulations of two co-located GEOs have proved that differential CEI-alone can be used to determine rel- ative orbit.
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