| 混合星座导航系统的加权几何精度因子分析 |
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| 引用本文： | 王梦丽,孙广富,王飞雪,雍少为.混合星座导航系统的加权几何精度因子分析[J].中国空间科学技术,2007,27(5):50-56. |
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| 作者姓名： | 王梦丽 孙广富 王飞雪 雍少为 |
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| 作者单位： | 国防科学技术大学电子科学与工程学院,国防科学技术大学电子科学与工程学院,国防科学技术大学电子科学与工程学院,国防科学技术大学电子科学与工程学院 长沙410073,长沙410073,长沙410073,长沙410073 |
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| 基金项目： | 教育部跨世纪优秀人才培养计划 |
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| 摘 要： | 不同类型卫星构成的混合星座导航系统或兼容系统中,考虑到广播星历精度不等导致的测距误差不等,用加权几何精度因子(WGDOP)代替几何精度因子(GDOP)作为最佳星座选择、定位精度评估和完好性监测的依据。对静止轨道卫星(GEO)/中高轨道卫星(MEO)构成的混合星座中不同卫星组合的WGDOP和GDOP进行了比较,实验结果表明WGDOP能更准确地反映星座性能和评估定位精度。在对定位精度或完好性监测的可靠性要求较高等场景,要用加权几何精度因子进行分析。
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| 关 键 词： | 加权几何精度因子 测距误差 星座 导航系统 |
| 修稿时间： | 2006-11-10 |
Weighted Geometric Dilution of Precision's Analysis for Mixed Constellation Navigation System |
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| Wang Mengli,Sun Guangfu,Wang Feixue,Yong Shaowei.Weighted Geometric Dilution of Precision's Analysis for Mixed Constellation Navigation System[J].Chinese Space Science and Technology,2007,27(5):50-56. |
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| Authors: | Wang Mengli Sun Guangfu Wang Feixue Yong Shaowei |
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| Institution: | School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073 |
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| Abstract: | In mixed constellation navigation system composed of different satellites or compatible systems,considering range errors caused by the ephemeris errors were different,weighted geometric dilution of precision was used in constellation selection,position accuracy evaluation and integrity monitoring instead of geometric dilution of precision.By calculating the different satellite combinations in constellation of geostationary earth orbit and middle earth orbit,it was found that weighted geometric dilution of precision was more valid in constellation selection and position accuracy evaluation in mixed constellation navigation system with different range errors.In such occassions that exigent requirements with position accuracy,high reliability of integrity monitoring etc,weighted geometric dilution of precision is reliable than geometric dilution of precision. |
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| Keywords: | Weighted geometric dilution of precision Range error Constellation Navigation system |
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