| 改进的GPS模糊度联合降相关算法 |
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| 引用本文： | 常志巧, 郝金明, 武殿文. 改进的GPS模糊度联合降相关算法[J]. 武汉大学学报 ( 信息科学版), 2009, 34(12): 1403-1406. |
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| 作者姓名： | 常志巧 郝金明 武殿文 |
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| 作者单位： | 1信息工程大学测绘学院,郑州市陇海中路66号450052;2内蒙古电力勘测设计院,呼和浩特市锡林郭勒南路209号010020 |
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| 基金项目： | 信息工程大学博士研究生学位论文创新基金资助项目；地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(06-07,08-01-07) |
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| 摘 要： | 针对联合降相关算法中存在的缺陷,提出了改进的联合降相关算法。该算法在降相关每个模糊度之前先查找精度最高的模糊度进行降相关,并将条件方差按照大致降序顺序排列。对联合降相关算法和改进的联合降相关算法进行仿真计算,结果表明,改进的联合降相关算法能降低方差-协方差矩阵的相关性,减少降相关过程所花费的时间,有效地提高条件搜索的速度。
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| 关 键 词： | GPS LAMDA方法 降相关 联合降相关算法 序贯条件最小二乘 |
| 收稿时间： | 2009-10-22 |
| 修稿时间： | 2009-10-22 |
An Improved United Ambiguity Decorrelation for GPS Ambiguity Solution |
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| CHANG Zhiqiao, HAO Jinming, WU Dianwen. An Improved United Ambiguity Decorrelation for GPS Ambiguity Solution[J]. Geomatics and Information Science of Wuhan University, 2009, 34(12): 1403-1406. |
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| Authors: | CHANG Zhiqiao HAO Jinming WU Dianwen |
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| Affiliation: | 1Institute of Surveying and Mapping,University of Information Engineering,66 Middle Longhai Road,Zhengzhou 450052,China;2Inner Mongolia Power Exploration & Design Institute,209 South Xilinguole Road,Hohhot 010020,China |
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| Abstract: | The improved united ambiguity decorrelation is proposed by analyzing the deficiency of united ambiguity decorrelation algorithms.The improved united ambiguity decorrelation needs search the most precise ambiguity to decorrelate before every decorrelation process and the conditional variances should be distributed in descending order approximately.The performances of the united ambiguity decorrelation algorithm and the improved united ambiguity decorrelation algorithm are compared by using 6 symmetric and positive definite matrixes derived from a random simulation for high dimension and low dimension,respectively.The results show the improved united ambiguity decorrelation algorithm is able to decorrelate the correlation of variance-covariance and has better performances on decreasing the time of decorrelation process and search process. |
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| Keywords: | GPS LAMDA algorithm decorrelation united ambiguity decorrelation algorithm sequential conditional least-squares |
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