BeiDou-3 launch: linear combination optimization model of BeiDou triple-frequency integral coefficientAug. 4,2020
The launch ceremony for BeiDou-3 Navigation Satellite System (BDS-3) was held on July 31 2020 at the Great Hall of the People in Beijing, China. Chinese President Xi Jinping, who is also general secretary of the Communist Party of China Central Committee and chairman of the Central Military Commission, announced the completion and commissioning of BDS-3, which marked the launch of full global services of the system.
BeiDou navigation project in China was launched as early as in 1994. After two geosynchronous equatorial orbit satellites launched, BeiDou-1 system became operational within China in 2000. After several years of update and development, BeiDou-3 system has been fully completed with a network of 30 satellites—3 geosynchronous equatorial orbit satellites, 3 inclined geosynchronous orbit satellites, and 24 medium-earth orbit satellites.
“The BeiDou Navigation Satellite System is the world’s first full-constellation satellite navigation system that broadcasts triple-frequency navigation signals”, said Prof. Meng fanjun from PLA Dalian Naval Academy. “Compared with dual-frequency systems, triple-frequency global navigation satellite system has several significant advantages. Specifically speaking, it can form the optimal combined observations that meet a variety of needs, thereby eliminating and suppressing errors, and improving the accuracy of cycle slip detection and correction and the success rate of ambiguity fixing. Thus, it can improve the real-time positioning accuracy of regional and global navigation satellite systems”, he added.
Meng et al. established a model of BeiDou triple-frequency combination observation combined with the existing research on multi-frequency combination optimization of GPS and Galileo system, and concluded the findings in the Linear Combination Optimization Model of BeiDou Triple-frequency Integral Coefficient Carrier Phase Observation published in Science of Surveying and Mapping. Starting from the perspective of geometry, they spatially described the real coefficient ionosphere-free combination, troposphere-free combination, and minimum noise combination. The relationship between each combination was obtained through analysis. Moreover, they used the number of lanes, the ionospheric delay coefficient and the noise amplification coefficient as the evaluation indicators to extract the optimal linear combinations of the BeiDou triple-frequency integral coefficient, and gave the applicable conditions of the optimal combinations.
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