Q-adjusting technique applied to vertical deflections estimation in a single-axis rotation INS/GPS integrated system

Jing Zhu; Xingshu Wang; Jun Wang; Dongkai Dai; Hao Xiong

doi:10.1117/12.2243850

19 October 2016 Q-adjusting technique applied to vertical deflections estimation in a single-axis rotation INS/GPS integrated system

Jing Zhu, Xingshu Wang, Jun Wang, Dongkai Dai, Hao Xiong

Author Affiliations +

Proceedings Volume 10155, Optical Measurement Technology and Instrumentation; 101550B (2016) https://doi.org/10.1117/12.2243850
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China

Abstract

Former studies have proved that the attitude error in a single-axis rotation INS/GPS integrated system tracks the high frequency component of the deflections of the vertical (DOV) with a fixed delay and tracking error. This paper analyses the influence of the nominal process noise covariance matrix Q on the tracking error as well as the response delay, and proposed a Q-adjusting technique to obtain the attitude error which can track the DOV better. Simulation results show that different settings of Q lead to different response delay and tracking error; there exists optimal Q which leads to a minimum tracking error and a comparatively short response delay; for systems with different accuracy, different Q-adjusting strategy should be adopted. In this way, the DOV estimation accuracy of using the attitude error as the observation can be improved. According to the simulation results, the DOV estimation accuracy after using the Q-adjusting technique is improved by approximate 23% and 33% respectively compared to that of the Earth Model EGM2008 and the direct attitude difference method.

Citation Download Citation

Jing Zhu, Xingshu Wang, Jun Wang, Dongkai Dai, and Hao Xiong "Q-adjusting technique applied to vertical deflections estimation in a single-axis rotation INS/GPS integrated system", Proc. SPIE 10155, Optical Measurement Technology and Instrumentation, 101550B (19 October 2016); https://doi.org/10.1117/12.2243850

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