| 轨道误差对近实时GPS遥感水汽的影响研究 |
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| 引用本文： | 曹云昌,方宗义,夏青.轨道误差对近实时GPS遥感水汽的影响研究[J].气象科技,2004,32(4):229-232. |
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| 作者姓名： | 曹云昌 方宗义 夏青 |
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| 作者单位： | 国家卫星气象中心,北京,100081 |
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| 基金项目： | 863 -2 0 0 2AA13 5 3 60“GPS应用于大气三维结构监测技术”研究项目资助 |
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| 摘 要： | 利用GPS技术近实时探测水汽对于气象预报、气候研究具有重要的应用价值，而近实时探测需要使用GPS卫星的预报星历，预报星历的误差会直接影响到实时水汽探测的精度。利用从IGS资料处理中心下载的精密预报星历和最终星历，对2000年北京GPS水汽试验中的资料进行了解算，并结合探空资料计算的水汽进行了分析。结果表明：以探空为标准，使用精密预报星历计算的水汽总量均方根误差为0．31cm，最终星历为0．30cm，二者差别不大，为0．01cm，证明使用精密预报星历可以满足近实时探测水汽的要求。
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| 关 键 词： | GPS 轨道误差 遥感 水汽 |
| 修稿时间： | 2003年6月30日 |
Impact of Orbit Errors on Near Real-time GPS Water Vapor Remote Sensing |
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| Cao Yunchang,Fang Zongyi,Xia Qing.Impact of Orbit Errors on Near Real-time GPS Water Vapor Remote Sensing[J].Meteorological Science and Technology,2004,32(4):229-232. |
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| Authors: | Cao Yunchang Fang Zongyi Xia Qing |
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| Abstract: | Near real-time (NRT) water vapor remote sensing by GPS is of great potential in weather forecasting and climate research. Availability and precision of the ephemeris are the key issues. The data from the 2000 Beijing GPS/VAPOR Experiment were processed by using the precisely predicted and final ephemeris files downloaded from IGS website, and GPS PWV (precipitable water vapor) was obtained. On the basis of the radiosonde water vapor, the PWV calculated from the predicted ephemeris shows a RMS of 0.31 cm, only 0.01 cm greater than that from the final. Therefore, the predicted ephemeris can meet the requirement of GPS NRT water vapor remote sensing. |
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| Keywords: | precipitable water vapor orbit errors GPS remote sensing |
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