| 基于伪距测量的钟差计算模型 |
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| 引用本文： | 刘利,韩春好,朱陵凤,郭睿,刘晓萍.基于伪距测量的钟差计算模型[J].时间频率学报,2009,32(1):36-42. |
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| 作者姓名： | 刘利 韩春好 朱陵凤 郭睿 刘晓萍 |
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| 作者单位： | 1. 中国科学院上海天文台,上海,200030;北京5136信箱,北京,100094
2. 北京5136信箱,北京,100094 |
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| 摘 要： | 基于伪距和钟差定义，讨论了无线电时间比对的基本原理。在此基础上，详细推导了地心非旋转坐标系中一般意义下基于伪码测距模式的钟差计算模型，并通过坐标变换，给出了地固系中的实用计算模型。对地回系计算模型的进一步分析表明：卫星在地固系运动速度引起的改正项与sagnac效应项是完全不同的两项改正；对于GEO卫星，sagnac效应项最大约为200ns，其地固系运动速度引起的改正约为1ns；而对于MEO卫星，sagnac效应项最大为120ns，其地固系运动速度引起的改正约为1200ns。
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| 关 键 词： | 卫星导航系统 坐标系 伪距 时间比对 钟差 |
Calculation Model of Clock Offset Based on Pseudorange Measurement |
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| LIU Li,HAN Chun-hao,ZHU Ling-feng,GUO Rui,LIU Xiao-ping.Calculation Model of Clock Offset Based on Pseudorange Measurement[J].Journal of Time and Frequency,2009,32(1):36-42. |
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| Authors: | LIU Li HAN Chun-hao ZHU Ling-feng GUO Rui LIU Xiao-ping |
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| Institution: | LIU Li, HAN Chun-hao,ZHU Ling-feng,GUO Rui, LIU Xiao-ping(1. Shanghai Astronomical Observatory, Chinese Academy of Science, Shanghai 200030, China; 2. P. O. Box 5136, Beijing 100094, China) |
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| Abstract: | According to the definitions of pseudorange and clock offset, the fundamental of time transfer of electromagnetic signal is discussed. The calculation models based on pseudorange in the geocentric non-rotating coordinate system are derived in detail. By means of coordinate transforming, the practical models in the Earth-fixed coordinate system are given. As a result, the correction from satellite movement in the Earth-fixed coordinate system is different from the correction of Sagnac effect. For GEO satellite, the maximum of Sagnac correction is 200 ns and the correction from satellite movement is about 1 ns. For MEO satellite, the maximum of Sagnac correction is 120 ns and the correction from satellite movement is about 1 200 ns. |
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| Keywords: | satellite navigation system coordinate system pseudorange time transfer clock offset |
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