| 3种PPP模型的统一模糊度固定方法 |
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| 引用本文： | 杜祯强,柴洪洲,向民志,尹潇,刘春鹤.3种PPP模型的统一模糊度固定方法[J].测绘学报,2020,49(7):824-832. |
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| 作者姓名： | 杜祯强 柴洪洲 向民志 尹潇 刘春鹤 |
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| 作者单位： | 信息工程大学地理空间信息学院, 河南 郑州 450001 |
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| 基金项目： | 国家自然科学基金（41574010； 41274045） |
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| 摘 要： | 精密单点定位(PPP)的模糊度经未校准硬件延迟小数部分(FCB)产品改正后,可恢复整周特性,能够显著缩短PPP的初始化时间。然而由于用户端模糊度固定模型需与服务端FCB产品保持一致,不仅造成了用户端面临不同FCB产品无法使用的问题,而且加重了服务端的链路传输压力。本文提出一种基于用户端3种PPP模型(消电离层组合、无电离层约束的非组合以及先验电离层约束的非组合模型)的统一模糊度固定方法,不同用户端可采用同一种FCB产品实现模糊度的快速固定。选取全球116个MGEX测站作为服务端生成3种FCB产品,选取未参与服务端解算的50个测站作为用户端进行验证。试验结果表明,本文方法解决了用户端面临不同FCB产品的PPP模糊度固定问题,在定位精度、收敛时间、固定率方面与传统方法保持一致。
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| 关 键 词： | 精密单点定位 fractional cycle biases(FCB) 模糊度固定 统一方法 |
| 收稿时间： | 2019-11-08 |
| 修稿时间： | 2020-01-11 |
Unified ambiguity resolution method based on three PPP Models |
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| DU Zhenqiang,CHAI Hongzhou,XIANG Minzhi,YIN Xiao,LIU Chunhe.Unified ambiguity resolution method based on three PPP Models[J].Acta Geodaetica et Cartographica Sinica,2020,49(7):824-832. |
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| Authors: | DU Zhenqiang CHAI Hongzhou XIANG Minzhi YIN Xiao LIU Chunhe |
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| Institution: | Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450001, Chinat |
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| Abstract: | The integer characteristics of the ambiguity can be recovered after the correction of fractional cycle biases (FCB), which can significantly shorten the initialization time of precise point positioning (PPP).However, the ambiguity resolution model of the clientend needs to be consistent with serverend, which may introduce the problem that the client maybe unable to use different FCB products and increases the transmission pressure of the server link. A unified PPP ambiguity resolution method is proposed that based on three PPP models,i.e.,ionosphere-free combination model, uncombined model without prior ionosphere constraint and uncombined model with prior ionosphere constraint.Different clients can use the same FCB product to achieve fast ambiguity resolution.A globally distributed network consisting of 116 MGEX stations is used to generates three kinds of FCB products at the server end, and 50 additional stations are selected at the client end for verification.The experimental results show that the new method solves the problem of ambiguity resolution of PPP at client end when facing different FCB products. Comparable performance with the traditional method can be achieved with regards to in positioning accuracy, convergence time and success rate. |
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