| 非差FCB估计及其在PPP模糊度固定中的应用 |
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| 引用本文： | 宋保丰,郝金明,师一帅,焦博.非差FCB估计及其在PPP模糊度固定中的应用[J].全球定位系统,2019,44(3):32-37. |
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| 作者姓名： | 宋保丰 郝金明 师一帅 焦博 |
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| 作者单位： | 1.信息工程大学 地理空间信息学院,河南 郑州 450001 |
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| 摘 要： | 模糊度固定能够显著提高精密单点定位(PPP)的精度和收敛速度,是国内外卫星导航定位领域的研究热点．本文通过最小二乘法分离接收机端和卫星端小数周偏差(FCB),恢复非差模糊度的整数特性,将得到的卫星端FCB提供给用户,能够实现非差模糊度固定的PPP．采用全球IGS跟踪站的观测数据进行非差FCB解算,实验结果表明,宽巷FCB的稳定性较好,一周内变化小于0.1周,而窄巷FCB一天内变化较大．将获得的FCB用于模糊度固定PPP实验,E、N、U三个方向的定位精度分别为0.7 cm、0.8 cm和2.1 cm,与浮点解PPP相比,分别提高68％、51％和37％,验证了本文估计的FCB用于模糊度固定PPP的定位性能
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| 关 键 词： | 小数周偏差 模糊度固定 精密单点定位 非差 精度分析 |
Non-difference FCB estimation and the application ?in fixed fuzziness of PPP |
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| Affiliation: | 1.Information Engineering University, Zhengzhou 450001, China2.Beijing Institute of Remote Sensing Information, Beijing 100192, China |
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| Abstract: | The ambiguity fixing technology can significantly improve the accuracy and convergence speed of precise point positioning (PPP), which is a research hotspot in the field of satellite navigation and positioning at home and abroad. In this paper, the receiver and satellite FCB are separated by the least square method, and the integer characteristic of non-difference ambiguity is restored. The obtained satellite-end FCB can be provided to the user to realize precise single-point positioning with fixed non-difference ambiguity. The experiment of zero-difference FCB estimation is implemented with the observations from IGS tracking stations worldwide. The result shows that wide-lane FCBs are stable and its variations in a week are within 0.1 cycle, but the variation of narrow-lane FCBs in a day is large. The estimated FCBs are used for the PPP experiment with ambiguity resolution. The position accuracy in E, N and U directions are 0.7 cm, 0.8 cm and 2.1 cm respectively. Compared with the floating-point PPP, the position accuracy in E, N and U directions are increased by 68％, 51％ and 37％ respectively, which verifies the performance of estimated FCBs for the ambiguity fixed PPP. |
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