| CHAMP观测资料的振幅反演初步结果 |
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| 引用本文： | 严豪健,张贵霞,郭鹏,刘敏,洪振杰.CHAMP观测资料的振幅反演初步结果[J].天文学报,2005,46(1):84-95. |
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| 作者姓名： | 严豪健 张贵霞 郭鹏 刘敏 洪振杰 |
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| 作者单位： | 1. 中国科学院上海天文台,上海,200030;中国科学院国家天文台,北京,100012
2. 温州师范学院数学与信息科学学院,浙江,温州,325027 |
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| 基金项目： | CXJJ-97,国家自然科学基金10073017
中国科学院知识创新工程重要方向项目KJCX2-SW-T1
走天地球动力学研究中心资助 |
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| 摘 要： | 在几何光学和薄相位屏的假设下，给出GPS／LEO无线电掩星反演地球大气技术中振幅反演的计算方法．从产生接收信号振幅变化的机制出发，提出产生信号振幅变化的几何衰减和物理衰减两个不同的源．利用CHAMP卫星观测资料的个例，用观测信噪比序列进行了大气弯曲角、大气折射率、压力、温度剖面的反演；并与相位反演结果进行比较和讨论．
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| 关 键 词： | CHAMP 反演 地球大气 无线电掩星 观测资料 卫星观测 大气折射率 接收信号 信噪比 相位 |
| 修稿时间： | 2004年2月5日 |
Preliminary Results of the Amplitude Retrieval from CHAMP Observation Data |
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| YAN Hao-jian ZHANG Gui-xia GUO Peng LIU Min HONG Zhen-jie.Preliminary Results of the Amplitude Retrieval from CHAMP Observation Data[J].Acta Astronomica Sinica,2005,46(1):84-95. |
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| Authors: | YAN Hao-jian ZHANG Gui-xia GUO Peng LIU Min HONG Zhen-jie |
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| Abstract: | Under the assumptions of geometric optics and thin phase screen the retrieval algorithms of amplitude in GPS/LEO occultation technique were listed. Geometric and physical decay sources producing observed signal amplitude variations were sorted according to their physical mechanisms. Using CHAMP observational data samples, the profiles of atmospheric bending, refractivity, pressure, and temperature were retrieved in tern by the series of signal noise ratio. The results were compared and discussed with that from phase process. The influences of both geometric and physical sources on the atmospheric retrievals were analyzed briefly. |
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| Keywords: | astrometry: earth's atmosphere artificial satellites: GPS LED CHAMP occulation |
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