Gravity compensation in a Strapdown Inertial Navigation System to improve the attitude accuracy

Jing Zhu; Jun Wang; Xingshu Wang; Shuai Yang

doi:10.1117/12.2281217

24 October 2017 Gravity compensation in a Strapdown Inertial Navigation System to improve the attitude accuracy

Jing Zhu, Jun Wang, Xingshu Wang, Shuai Yang

Proceedings Volume 10463, AOPC 2017: Space Optics and Earth Imaging and Space Navigation; 104630R (2017) https://doi.org/10.1117/12.2281217
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China

Abstract

Attitude errors in a strapdown inertial navigation system due to gravity disturbances and system noises can be relatively large, although they are bound within the Schuler and the Earth rotation period. The principal objective of the investigation is to determine to what extent accurate gravity data can improve the attitude accuracy. The way the gravity disturbances affect the attitude were analyzed and compared with system noises by the analytic solution and simulation. The gravity disturbances affect the attitude accuracy by introducing the initial attitude error and the equivalent accelerometer bias. With the development of the high precision inertial devices and the application of the rotation modulation technology, the gravity disturbance cannot be neglected anymore. The gravity compensation was performed using the EGM2008 and simulations with and without accurate gravity compensation under varying navigation conditions were carried out. The results show that the gravity compensation improves the horizontal components of attitude accuracy evidently while the yaw angle is badly affected by the uncompensated gyro bias in vertical channel.

Citation Download Citation

Jing Zhu, Jun Wang, Xingshu Wang, and Shuai Yang "Gravity compensation in a Strapdown Inertial Navigation System to improve the attitude accuracy", Proc. SPIE 10463, AOPC 2017: Space Optics and Earth Imaging and Space Navigation, 104630R (24 October 2017); https://doi.org/10.1117/12.2281217

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