| BDS/GPS实时钟差估计中ISB分析与函数模型设计 |
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| 引用本文： | 谷守周,施闯,党亚民,秘金钟,薛树强,张龙平.BDS/GPS实时钟差估计中ISB分析与函数模型设计[J].测绘通报,2018,0(1):22-27. |
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| 作者姓名： | 谷守周 施闯 党亚民 秘金钟 薛树强 张龙平 |
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| 作者单位： | 1. 武汉大学卫星导航定位技术研究中心, 湖北 武汉 430079;
2. 中国测绘科学研究院, 北京 100830;
3. 山东科技大学, 山东 青岛 266590 |
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| 基金项目： | 国家重点研发计划课题，国家自然科学基金，全球连续监测评估系统项目，国家863计划项目，国家基础测绘科技项目，中国测绘科学研究院基本科研业务费 |
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| 摘 要： | 实时钟差产品是高精度广域差分位置服务（亚米级、分米级、厘米级）的基础产品，通过研究BDS/GPS融合的ISB，研究了各类型接收机BDS GEO/IGSO/MEO ISB差异，提出了在BDS/GPS联合的实时钟差估计中引入3个ISB参数的函数模型，在此基础上基于非差法实现了BDS/GPS联合的实时钟差估计。采用MGEX和湖南CORS实时观测数据进行了实时钟差解算，利用iGMAS产品综合中心提供的事后精密钟差产品作为基准，对比分析了新方法与原有方法的实时钟差产品的精度差异。结果表明，该方法与原方法估计的GPS钟差精度相当，对BDS实时钟差精度改进显著，尤其对BDS IGSO/MEO卫星，改进幅度在20%以上，验证了算法的有效性。
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| 关 键 词： | 精密钟差估计 三参数函数模型 非差 BDS/GPS |
| 收稿时间： | 2017-04-26 |
ISB Analysis and Function Model Design in the Real-time BDS/GPS Clock Estimation |
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| GU Shouzhou,SHI Chuang,DANG Yamin,BI Jinzhong,XUE Shuqiang,ZHANG Longping.ISB Analysis and Function Model Design in the Real-time BDS/GPS Clock Estimation[J].Bulletin of Surveying and Mapping,2018,0(1):22-27. |
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| Authors: | GU Shouzhou SHI Chuang DANG Yamin BI Jinzhong XUE Shuqiang ZHANG Longping |
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| Institution: | 1. GNSS Research Center, Wuhan University, Wuhan 430079, China;
2. Chinese Academy of Surveying and Mapping, Beijing 100830, China;
3. Shandong University of Science and Technology, Qingdao 266590, China |
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| Abstract: | The real-time clock product is the basis products for the high precision wide-area positioning service.Focus on inner-system bias of BDS/GPS,we have studied the ISB difference of BDS GEO/IGSO/MEO with various GNSS receivers,and then proposed three ISB parameters model,finally real-time BDS/GPS clock estimation is achieved with undifferenced method.The BDS/GPS observations of 78 MGEX global sites and 2 Hunan province CORS site are collected to generate the real time clock products that was compared with the final iGMAS precise clock product in two strategies ( the old model and the new model) .The results show that the accuracy of GPS clock estimation is equivalent with the two strategies,and the accuracy of BDS clock estimation is improved significantly with the new method,especially for the BDS IGSO/MEO satellite,the improvement is more than 20％,which verifies the validity of the algorithm. |
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| Keywords: | precision clock estimation three ISB parameters model undifferenced BDS/GPS |
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