| 顾及历元间坐标差信息的GPS模糊度快速固定改进方法 |
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| 引用本文： | 易重海,陈源军.顾及历元间坐标差信息的GPS模糊度快速固定改进方法[J].武汉大学学报(信息科学版),2019,44(4):489-494. |
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| 作者姓名： | 易重海 陈源军 |
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| 作者单位： | 1.中南大学地球科学与信息物理学院, 湖南?长沙, 410083 |
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| 基金项目： | 国家自然科学基金41204024国家测绘地理信息局测绘基础研究基金12-01-06现代城市测绘国家测绘地理信息局重点实验室开放课题20111202W |
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| 摘 要： | 单频全球定位系统模糊度在航解算过程中存在法方程病态的问题，利用历元间坐标差信息可以在一定程度上削弱法方程的病态性，提高模糊度浮点解的精度和模糊度收敛速度。为进一步提高历元间坐标差法固定模糊度的效率，提出了一种改进的历元间坐标差方法，该方法对历元间坐标差虚拟观测误差方程进行了重构，并给出了新的虚拟观测值方差阵。实验结果表明，新方法较之以往的历元间坐标差方法具有更优的稳定性和效率。
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| 关 键 词： | 单频 动态定位 病态性 历元间坐标差 模糊度解算 |
| 收稿时间： | 2017-07-12 |
An Improved GPS Fast Ambiguity Resolution Algorithm with Epoch-Differenced Coordinate Information |
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| Affiliation: | 1.School of Geosciences and Info-Physics, Central South University, Changsha 410083, China2.Guangzhou Hi-Target GNSS Navigation Technology Co Ltd, Guangzhou 511400, China |
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| Abstract: | Single-frequency GPS ambiguity resolution on-the-fly has the problem that normal equation is ill-posed. Using epoch-differenced coordinate information between neighboring epochs can mitigate the ill-condition problem to some extent, as a result, the accuracy of the float ambiguity solution will be improved and the convergence time of ambiguity will be shortened. In order to further improve the ambiguity fixing effciency of epoch-differenced method, the epoch-differenced coordinate pseudo-observation error equation and its new variance matrix is reconstructed. The experimental results show that, compared with the previous algorithm with epoch-differenced coordinate information, the new method has higher stability and efficiency. |
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