Searching Algorithm with Granularity Changing and the GNSS Integer Ambiguity Estimation

2009 ◽  
Author(s):  
Xiaoping Chen ◽  
Rongle Kang
Keyword(s):  
Integer Ambiguity ◽  
Ambiguity Estimation

scholarly journals Integer Ambiguity Fixation Based on SC-PAR Algorithm

2021 ◽  
Vol 2083 (4) ◽  
pp. 042093
Author(s):  
Xizi Jia ◽  
Yuanfa Ji ◽  
Wentao Fu ◽  
Weibin Liang ◽  
Bingye Pan
Keyword(s):  
Signal To Noise Ratio ◽  
Attenuation Factor ◽  
Elevation Angle ◽  
Integer Ambiguity ◽  
Single Frequency ◽  
Fixed Rate ◽  
R Ratio ◽  
Geometric Precision ◽  
Ambiguity Estimation ◽  
Satellite Signal

Abstract In terms of quality control of ambiguity estimation, the common partial ambiguity fixation algorithm is improved, and the SC-PAR (Single frequency Combined Partial Ambiguity Resolution) algorithm is proposed. After the algorithm fails to fix the full ambiguity, it filters the ambiguity subset step by step according to the number of continuous satellite lock epochs, satellite elevation angle, satellite signal-to-noise ratio, geometric precision factor, ambiguity variance and ambiguity precision attenuation factor, and searches Optimal ambiguity subset. According to the R-ratio value and the success rate index, the search results are jointly tested, and the remaining subsets are corrected with the subsets that pass the test. The results show that compared with the FAR and conventional PAR algorithms, the fixed rate of the SC-PAR algorithm is increased by 65.01% and 27.97%, respectively, and the accuracy is also significantly improved.

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