| 确定卫星与接收机信号延迟偏差的新方法及其应用 |
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| 引用本文： | 许才军,陈永奇,刘焱雄.确定卫星与接收机信号延迟偏差的新方法及其应用[J].测绘学报,1999,28(2):162-171. |
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| 作者姓名： | 许才军 陈永奇 刘焱雄 |
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| 作者单位： | 1. 武汉测绘科技大学地学测量工程学院,武汉,430079
2. 香港理工大学土地测量与地理信息资讯学系,香港 |
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| 摘 要： | 单频ＧＰＳ接收机用户通常需要进行电离层延迟改正，电离层延迟改正量通常来源于电离层延迟改正模型或双频ＧＰＳ基准站信息，后者即是利用双频ＧＰＳ观测值估计电子含量总数，求解电离层延迟改正量。利用双频ＧＰＳ观测值估计电子含量总数，一个关键总是是去掉卫星与接收信号延迟偏差。
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| 关 键 词： | 电子含量总数 卫星与接收机信号延迟偏差 梯度模型 |
A new algorithm of estimate instrumental biases and its application to DGPS reference stations in Hong Kong area |
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| Xu Caijun,Chen Yongqi,Liu Yanxiong.A new algorithm of estimate instrumental biases and its application to DGPS reference stations in Hong Kong area[J].Acta Geodaetica et Cartographica Sinica,1999,28(2):162-171. |
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| Authors: | Xu Caijun Chen Yongqi Liu Yanxiong |
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| Abstract: | One of challenging problems in estimating Total Electron Content (TEC) using the dual-frequency GPS observations is to remove the satellite and receiver instrumental biases. This paper proposes a new algorithm, for estimating the satellite and receiver instrumental biases as well as the TEC at GPS station, using dual GPS data, and this algorithm based on gradient model is used to calculate the Satellite-Plus-Receiver (SPR) differential delays in DGPS stations in Hong Kong area. The arithmetic mean of the SPR differential delay estimates over all 25 GPS satellites over the 11 days are 4.34±0.44 TECU（1.52±0.15 ns）, 37.32±0.47 TECU(13.08±0.16 ns) at Kau Yi Chou station and Fanling station respectively. The GPS satellite biases are in the range -5.34 TECU(-1.87 ns) to +9.36 TECU(3.28 ns). The standard deviation of estimated satellite differential delay bias differences between the values determined by Jet Propulsion Laboratory and other organizations is generally about 2.8 TECU(1.0 ns) level. Without calibrating for this SPR differential delay, it is impossible to obtain precise TEC and ionospheric delay estimation from GPS measurements. |
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| Keywords: | TEC Satellite and receiver differential delay biases Gradient model |
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