QIAO Chuan,LI Xiao,PANG Shao-long,et al.Starlight-inertial integrated navigation based on single star vector[J].Optics and Precision Engineering,2021,29(03):503-512.
QIAO Chuan,LI Xiao,PANG Shao-long,et al.Starlight-inertial integrated navigation based on single star vector[J].Optics and Precision Engineering,2021,29(03):503-512. DOI: 10.37188/OPE.20212903.0503.
Starlight-inertial integrated navigation based on single star vector
A small-field optical system is typically used in an all-day star sensor to reduce the stray light effect. Generally, only one star can be observed at a particular time by an all-day star sensor, and attitude information cannot be output. Therefore, a method of starlight-inertial integrated navigation based on a single star vector was developed in this study. First, the turntable and the mirror were controlled using the position and attitude information provided by the inertial navigation system to track the star. Next, the state equation was derived using the inertial navigation error model, and the measurement equation was established based on the direction vector of a single star, which was measured using the star sensor. The position and the attitude information were corrected through Kalman filtering. Because the installation attitude error was pulled in the state quantity, the installation attitude error and the navigation information were estimated simultaneously. It was unnecessary to calibrate the installation attitude between the star sensor and inertial navigation in the laboratory. Therefore, this method was proven to show stronger project practicability. The effects of the star sensor and inertial navigation error and the calibration error of the installation attitude were analyzed through simulation, which showed that the position and attitude errors after 1 h were less than 90 m and 8″, respectively. Compared to the navigation method, which is typically used for installation attitude calibration in the laboratory, this integrated navigation algorithm showed better accuracy. Finally, the validity of the integrated navigation algorithm was verified through static navigation tests. The navigation position error was 102.90 m, which was lower than that obtained based on the calibrated installation attitude by 45.39%.
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