Instantaneous and controllable integer ambiguity resolution: review and an alternative approach

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• 作者：Jingyu Zhang ; Meiping Wu ; Tao Li ; Kaidong Zhang
• 关键词：Ambiguity resolution ; Integer aperture estimator ; Instantaneous ; Controllable failure rate ; Monte Carlo sampling
• 刊名：Journal of Geodesy
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：89
• 期：11
• 页码：1089-1108
• 全文大小：2,146 KB
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• 作者单位：Jingyu Zhang (1)
  Meiping Wu (1)
  Tao Li (1)
  Kaidong Zhang (1)
  
  1. College of Mechatronics and Automation, National University of Defense Technology, Changsha, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Mathematical Applications in Geosciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1394

文摘

In the high-precision application of Global Navigation Satellite System (GNSS), integer ambiguity resolution is the key step to realize precise positioning and attitude determination. As the necessary part of quality control, integer aperture (IA) ambiguity resolution provides the theoretical and practical foundation for ambiguity validation. It is mainly realized by acceptance testing. Due to the constraint of correlation between ambiguities, it is impossible to realize the controlling of failure rate according to analytical formula. Hence, the fixed failure rate approach is implemented by Monte Carlo sampling. However, due to the characteristics of Monte Carlo sampling and look-up table, we have to face the problem of a large amount of time consumption if sufficient GNSS scenarios are included in the creation of look-up table. This restricts the fixed failure rate approach to be a post process approach if a look-up table is not available. Furthermore, if not enough GNSS scenarios are considered, the table may only be valid for a specific scenario or application. Besides this, the method of creating look-up table or look-up function still needs to be designed for each specific acceptance test. To overcome these problems in determination of critical values, this contribution will propose an instantaneous and CONtrollable (iCON) IA ambiguity resolution approach for the first time. The iCON approach has the following advantages: (a) critical value of acceptance test is independently determined based on the required failure rate and GNSS model without resorting to external information such as look-up table; (b) it can be realized instantaneously for most of IA estimators which have analytical probability formulas. The stronger GNSS model, the less time consumption; (c) it provides a new viewpoint to improve the research about IA estimation. To verify these conclusions, multi-frequency and multi-GNSS simulation experiments are implemented. Those results show that IA estimators based on iCON approach can realize controllable ambiguity resolution. Besides this, compared with ratio test IA based on look-up table, difference test IA and IA least square based on the iCON approach most of times have higher success rates and better controllability to failure rates. Keywords Ambiguity resolution Integer aperture estimator Instantaneous Controllable failure rate Monte Carlo sampling