A Comparative Study of AFM-Assisted Direct and Least-Square Attitude Determination Algorithm
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Based on GNSS (Global Navigation Satellite System) technology, the importance of vehicle attitude calculation has become more and more prominent in military and civilian fields. In this paper, an attitude determination algorithm assisted by ambiguity function method (AFM) is proposed. Due to the characteristics of the AFM algorithm is insensitive to cycle slip and independent of initial ambiguity, and considering the large amount of computation and the long computation time, it is used as an auxiliary means for initial attitude search and error correction in the search process, and C-LAMBDA algorithm is used to complete the ambiguity resolution. The attitude angle is calculated by direct and least square method, and the accuracy of the attitude angle based on the AFM-assisted method is compared. Through the static experiment of dual antenna direction finding and three antenna attitudes finding, the accuracy of direction and attitude angle is analyzed. It is concluded that the attitude calculation accuracy based on AFM-assisted least square method is usually higher.
KeywordsAFM The direct method Least square method
This work has been supported by the following units and projects. They are the National Key R&D Program of China (2018YFB0505103), the National Natural Science Foundation of China (61561016, 61861008), Department of Science and Technology of Guangxi Zhuang Autonomous Region (AC16380014, AA17202048, AA17202033), Sichuan Science and Technology Plan Project (17ZDYF1495), Guilin Science and Technology Bureau Project (20160202, 20170216), the basic ability promotion project of young and middle-aged teachers in Universities of Guangxi province (ky2016YB164), the 2019 School-level Graduate Innovation Program (2019YCXS024).
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