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中文摘要：
给出了X射线脉冲星导航中,利用单差、双差观测量根据几何法确定航天器位置的基本方法。通过仿真试算,重点分析了各类误差项对位置确定精度的影响。
英文摘要：
Geometric methods of spacecraft position determination using single phase and double difference measurements in X-ray pulsar navigation are introduced. Through simulating calculation, the influence of errors on precision of position determination are analysed. The influence of phase error is very large. The error of range measurement, ephemeris and clock offset can all lead to 10z m position determination error. Double difference can eliminate the influence of clock offset but magnifies the ephemeris error. The decrease of position error with the increase of the number of observed pulsar is related to the influence of range measurement error.
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