Analysis and Compensation of Sun Direction Error on Solar Disk Velocity Difference

Mingzhen Gui, Hua Yang, Dangjun Zhao (), Mingzhe Dai and Chengxi Zhang
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Mingzhen Gui: School of Automation, Central South University, Changsha 410083, China
Hua Yang: School of Automation, Central South University, Changsha 410083, China
Dangjun Zhao: School of Automation, Central South University, Changsha 410083, China
Mingzhe Dai: School of Automation, Central South University, Changsha 410083, China
Chengxi Zhang: School of Internet of Things Engineering, Jiangnan University, Wuxi 214082, China

Mathematics, 2023, vol. 11, issue 17, 1-14

Abstract: Solar disk velocity difference is an emerging celestial navigation measurement acquired through four spectrometers positioned on the four corners of the quadrangular pyramid. The alignment of the pyramid’s axis with the direction from the sun to the spacecraft is crucial. However, the sun sensor measurement error inevitably leads to the sun direction error, which both significantly affect navigation accuracy. To address this issue, this article proposes an augmented state sun direction/solar disk velocity difference integrated navigation method. By analyzing the impact of the sun direction error on sun direction and solar disk velocity difference measurements, the errors of the solar elevation and azimuth angle are extended to the state vector. The navigation method establishes state and measurement models that consider these errors. Simulation results show that the position error and velocity error of the proposed method are reduced by 97.51% and 96.91% compared with those of the integrated navigation with the sun direction error, respectively. The result demonstrates that the proposed method effectively mitigates the impact of sun direction error on navigation performance. In addition, the proposed method can maintain a satisfactory error suppression effect under different sun direction error values.

Keywords: system error suppression; solar disk velocity difference; unscented Kalman filter; celestial navigation (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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