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Open AccessArticle

Constrained MLAMBDA Method for Multi-GNSS Structural Health Monitoring

1
GNSS Research Center, Wuhan University, Wuhan 430079, China
2
Southern Surveying and Mapping Geographic Company, Guangzhou 510663, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(20), 4462; https://doi.org/10.3390/s19204462
Received: 18 September 2019 / Revised: 12 October 2019 / Accepted: 14 October 2019 / Published: 15 October 2019
Deformation monitoring of engineering structures using the advanced Global Navigation Satellite System (GNSS) has attracted research interest due to its high-precision, constant availability and global coverage. However, GNSS application requires precise coordinates of points of interest through quick and reliable resolution of integer ambiguities in carrier phase measurements. Conventional integer ambiguity resolution algorithms have been extensively researched indeed in the past few decades, although the application of GNSS to structural health monitoring is still limited. In particular, known a priori information related to the structure of a body of interest is not normally considered. This study proposes a composite strategy that incorporates modified least-squares ambiguity decorrelation adjustment (MLAMBDA) method with priori information of the structural deformation. Data from the observation sites of Baishazhou Bridge are used to test method performance. Compared to MLAMBDA methods that do not consider priori information, the ambiguity success rate (ASR) improves by 20% for global navigation satellite system (GLONASS) and 10% for Multi-GNSS, while running time is reduced by 60 s for a single system and 180 s for Multi-GNSS system. Experimental results of Teaching Experiment Building indicate that our constrained MLAMBDA method improves positioning accuracy and meets the requirements of structural health monitoring, suggesting that the proposed strategy presents an improved integer ambiguity resolution algorithm. View Full-Text
Keywords: GNSS deformation monitoring; integer ambiguity resolution; multi-GNSS; MLAMBDA; known priori information; constraint conditions GNSS deformation monitoring; integer ambiguity resolution; multi-GNSS; MLAMBDA; known priori information; constraint conditions
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Li, H.; Nie, G.; Chen, D.; Wu, S.; Wang, K. Constrained MLAMBDA Method for Multi-GNSS Structural Health Monitoring. Sensors 2019, 19, 4462.

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