| 风云四号静止气象卫星测距站坐标测量点的确定及修正 |
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| 引用本文： | 贾耀红,裘奕,郭强.风云四号静止气象卫星测距站坐标测量点的确定及修正[J].气象科技,2021,49(3):342-347. |
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| 作者姓名： | 贾耀红 裘奕 郭强 |
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| 作者单位： | 国家卫星气象中心，北京 100094 |
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| 基金项目： | 风云四号02批气象卫星工程地面应用系统项目资助 |
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| 摘 要： | 风云四号(FY-4)静止气象卫星是通过测量多个地面站到卫星的距离实现对卫星的轨道确定和预报,所以测距站站址坐标是影响定轨精度的主要因素之一。星地间距离通常是指地面天线相位中心到卫星天线相位中心之间的距离,但是FY-4测距站天线的相位中心无法用作测距距离起始参考点和站址坐标测量点。本文针对FY-4测距站简易半转台天线的特殊结构,结合卡塞格伦天线的工作原理,确定出测距距离起始参考点及站址坐标测量点,并给出这两者之间距离的修正算法。最后根据FY-4卫星太空分布位置及各个测距站跟踪状况分析了修正结果,并对在工程中实施方法提出了建议。
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| 关 键 词： | FY 4卫星 测距站天线 相位中心 距离起始参考点 站址坐标测量点 距离修正 |
| 收稿时间： | 2020/7/24 0:00:00 |
| 修稿时间： | 2020/10/23 0:00:00 |
Correction and Confirmation of Coordinate Measurement Points for FY-4 Ranging Stations |
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| JIA Yaohong,QIU Yi,GUO Qiang.Correction and Confirmation of Coordinate Measurement Points for FY-4 Ranging Stations[J].Meteorological Science and Technology,2021,49(3):342-347. |
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| Authors: | JIA Yaohong QIU Yi GUO Qiang |
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| Institution: | National Satellite Meteorological Centre, Beijing 100094 |
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| Abstract: | The FY 4 geostationary meteorological satellite gets its orbit determination and prediction through ranging the distances from different ground stations to the satellite, so the coordinates of each station site are one of main factors which influence the accuracy of the orbit determination. The satellite ground distance is the distance from the antenna phase center of a ground station to that of the satellite in general, but the antenna phase center of the FY 4 ranging station antenna cannot be used to determine the starting reference point of the ranging distance and site coordinate measuring point. On the basis of the theory of the Cassegrain antenna, the following are discussed: where the starting point of ranging is and how to fix the point of coordinates to measure in the condition of the special structure of the antenna. The correction algorithm is given from coordinate measurement point to the ranging start point. Taking the FY 4B antenna for an example, the result of correction is analyzed according to the actual condition that five ground stations follow the satellites distributed in seven different sites of space. Finally, suggestions are provided for practical application. |
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| Keywords: | FY 4 satellite ranging station antenna antenna phase center ranging start point station coordinate distance correction |
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