| GPS导航电文核心定位参数发展演变分析 |
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| 引用本文： | 常志巧,辛洁,时鑫,黄双临,邵佳妮.GPS导航电文核心定位参数发展演变分析[J].全球定位系统,2021,46(6):37-43. |
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| 作者姓名： | 常志巧 辛洁 时鑫 黄双临 邵佳妮 |
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| 作者单位： | 32021部队, 北京 100094 |
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| 基金项目： | 国家重点基础研究发展计划(2016YFB0501900)；国家自然科学基金资助课题(42004028, 41874043, 41804030, 41674041) |
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| 摘 要： | 文章总结了GPS空间信号接口控制文件的发展历程，对比了现有3种导航电文类型的电文结构及播发方式， 详细分析了星历参数、钟差参数及完好性参数等核心定位参数的发展演变特点和改进效果. 结果表明:GPS新型导航电文采用增加核心定位参数和减小量化单位的方法，提高了广播星历和钟差产品的精度. 增加两个参数后，地面星历拟合位置误差均方根(RMS)平均值由0.137 m减小为0.025 m. 为适应高精度星历拟合模型，距离量化单位也减小至毫米量级. 通过减小卫星钟差参数的量化单位，预报1 h钟差误差RMS由0.097 m减小至0.042 m.
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| 关 键 词： | GPS 接口控制文件 星历参数 钟差参数 完好性参数 |
| 收稿时间： | 2021-07-05 |
Analysis on the development of core positioning parameters of GPS navigation message |
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| Affiliation: | Troops 32021, Beijing 100094, China |
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| Abstract: | This paper summarizes the development process of GPS spatial signal interface control file, and compares the message structure and broadcast mode of three existing navigation message types. The development characteristics and improvement effects of ephemeris parameters, clock error parameters and integrity parameters are analyzed in detail. The analysis results show that the new GPS navigation message provides high accuracy of broadcast ephemeris and clock error products by increasing the core positioning parameters and reducing the quantization unit. After adding two parameters, the average root mean square (RMS) value of the ephemeris fitting position error is reduced from 0.137 m to 0.025 m. In order to adapt to the high-precision ephemeris fitting model, the distance quantization unit is also reduced to millimetre. By reducing the quantization unit of satellite clock error parameters, the RMS predicted 1 h clock error is reduced from 0.097 m to 0.042 m. |
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