Attitude estimation performance enhancement for Gokturk-2 satellite

Date

2023-7-26

Author

Kahraman, Özgür

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In terms of Gokturk-2 satellite Attitude and Orbit Control Subsystem- AOCS estimation performance, couple of methods are proposed to increase the onground accuracy. First of all, customized star tracker (STR) delay compensation methods are compared since they are widely used for fine attitude estimation. Due to the processing time for tasks such as star identification, tracking and attitude solution, a STR can provide the attitude quaternion measurements with a time-delay, which may be as high as few 100 milliseconds. This study evaluates different time delay compensation methods to incorporate delayed STR measurements in the Gokturk-2 satellite attitude filter, which is structured as Multiplicative Extended Kalman Filter (MEKF). They are both evaluated using the simulated data generated for an Earth observation satellite and the logged real STR data. The usage of additional gyro data to evaluate the estimation performance of the proposed method is also demonstrated using the real-logged data. The results show that, both demontration results with simulated and real data confirm that one of the proposed methods clearly overcomes the others in terms of attitude estimation accuracy.

Subject Keywords

Gokturk-2, AOCS, Star Tracker Delay, Göktürk-2, YYKS, Yıldızizler Gecikmesi

URI

https://hdl.handle.net/11511/104894

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Graduate School of Natural and Applied Sciences, Thesis