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中文摘要：
根据下行伪距观测模型给出了上行伪距观测模型,比较了主要误差项对于上、下行伪距的不同影响,并模拟了星地双向伪距数据,进一步处理了模拟数据,得到了星地钟差。通过与星地钟差的真值比较,验证了算法的可靠性。
英文摘要：
The mathematic model of up-link is set up according to a down-link model. The effects of major errors on the downlink and uplink are compared. The results of some simulated tests are reported, in which two-way links are simulated, the clock offsets between satellits and ground are achieved by processing the simulated data. This method are verified by comparing clock offsets with their truth values. Some meaningful conclusions are made.
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