An Improved In-Motion Coarse Alignment Method for SINS/GPS Integration with Initial Velocity Error Suppression

被引:1
|
作者
Wang, Yukun [1 ]
Ning, Xiuli [2 ]
Xu, Xiang [3 ]
机构
[1] Beijing Inst Technol, Sch Mechatron Engn, Beijing 100081, Peoples R China
[2] China Natl Inst Standardizat, Beijing 100191, Peoples R China
[3] Nanjing Univ Sci & Technol, Sch Automat, Nanjing 210094, Peoples R China
基金
中国国家自然科学基金;
关键词
initial velocity errors; average operation for observation vectors; in-motion coarse alignment; SINS; GPS; NAVIGATION;
D O I
10.3390/s23073662
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The integrated system with the strapdown inertial navigation system (SINS) and the global positioning system (GPS) is the most popular navigation mode. It has been used in many navigation fields. Before the integrated system works properly, it must determine the initial attitude for SINS. In SINS/GPS-integrated systems, the navigational velocity can be used to carry out the initial alignment when the system is installed in the in-motion vehicle. However, the initial velocity errors are not considered in the current popular in-motion alignment methods for SINS/GPS integration. It is well-known that the initial velocity errors must exist when the initial velocity is obtained from the GPS outputs. In this paper, an improved method was proposed to solve this problem. By analyzing the original observation vectors in the in-motion coarse alignment method, an average operation was used to construct the intermediate vectors, and the new observation vector can be calculated by subtracting the intermediate vector from the original observation vector. Then, the initial velocity errors can be eliminated from the newly constructed observation vector. Thus, the interferences of the initial velocity errors for the initial alignment process can be suppressed. The simulation and field tests are designed to verify the performance of the proposed method. The tests results showed that the proposed method can obtain the higher accurate results than the current methods when the initial velocity is considered. Additionally, the results of the proposed method were similar to the current methods when the initial velocity errors were not considered. This shows that the initial velocity errors were eliminated effectively by the proposed method, and the alignment accuracy were not decreased.
引用
收藏
页数:13
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