| COSMIC低轨卫星GPS接收机差分码偏差估计 |
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| 引用本文： | 张小红,唐龙.COSMIC低轨卫星GPS接收机差分码偏差估计[J].地球物理学报,2014,57(2):377-383. |
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| 作者姓名： | 张小红 唐龙 |
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| 作者单位： | 武汉大学测绘学院, 武汉 430079 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)(2013CB73301);国家自然科学基金(41074024,41204030)资助 |
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| 摘 要： | GPS接收机差分码偏差（Differential Code Bias，DCB）是利用COSMIC低轨卫星观测值反演电离层总电子含量TEC的一项重要误差源.本文将COSMIC卫星轨道高度以上的电离层作为一个单层，采用球谐函数来参数化电离层TEC值，并利用最小二乘法同时估算电离层球谐系数和DCB参数.运用这种方法对2012年12月份的所有COSMIC卫星GPS接收机DCB进行了解算，并与COSMIC数据分析与档案中心CDAAC提供的产品进行了比较.实验结果表明：在2012年12月期间，估计的接收机DCB与CDAAC结果符合的较好，二者DCB变化趋势相近，DCB差值的RMS值在2 TECU以内，且最大绝对差值小于3 TECU；此外，本文计算的接收机DCB估计误差主要分布在0.2~0.4 TECU之间，具有较高的内符合精度.
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| 关 键 词： | COSMIC卫星 电离层 总电子含量 接收机差分码偏差 |
| 收稿时间： | 2013-05-21 |
Estimation of COSMIC LEO satellite GPS receiver differential code bias |
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| ZHANG Xiao-Hong;TANG Long.Estimation of COSMIC LEO satellite GPS receiver differential code bias[J].Chinese Journal of Geophysics,2014,57(2):377-383. |
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| Authors: | ZHANG Xiao-Hong;TANG Long |
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| Institution: | School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China |
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| Abstract: | GPS receiver differential code bias (DCB) is an important error source in inversing ionospheric total electron content (TEC) using COSMIC LEO satellite observations. In this paper, the ionosphere above COSMIC satellite orbit altitude is assumed to be concentrated on a single layer and the TEC is parameterized using spherical harmonic expansion, and then we estimate the ionospheric spherical harmonic coefficients and DCB parameters with least square method. The entire COSMIC GPS receiver DCBs in December 2012 are calculated and compared to the products provided by COSMIC Data Analysis and Archival Center (CDAAC). The result shows that estimated receiver DCBs match better with CDAAC products: the variation trend of DCBs is similar, the RMS of DCBs differences is lower than 2 TECU and maximum absolute difference is less than 3 TECU in December 2012. In addition, the estimated errors of receiver DCBs calculated in this paper are mainly distributed in 0.2~0.4 TECU suggesting the inner precision is higher. |
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| Keywords: | COSMIC satellites Ionosphere Total electron content Receiver differential code bias |
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