›› 2012, Vol. 32 ›› Issue (4): 62-70.doi: 10.3780/j.issn.1000-758X.2012.04.009

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Autonomous Navigation and In-orbit Parameter Calibration for Continuous Low Thrust Spacecraft

Shi Heng,Xu Shijie   

  1. (Beihang University, Beijing 100191)
  • Received:2012-01-30 Revised:2012-03-27 Online:2012-08-25 Published:2012-08-25

Abstract: Novel autonomous navigation scheme was proposed for continuous low thrust spacecraft with synchronized calibration on accelerometer, thruster and solar radiation coefficient of the spacecraft. Firstly, by selecting precise attitude measurements and gravity gradient model as reference information,the calibration parameter models was established and the observability was discussed. Secondly, system dynamics and measurement models were developed based on spacecraft celestial navigation methods with observability guarantee. Dual-unscented Kalman filter was then designed to estimate the calibration parameters and navigation system states in an error-robust and integrated manner. The proposed method has directly reduced the navigation model errors through in-orbit parameter calibration, making it preferable in feasibility and effectiveness.  

Key words: Dual unscented Kalman filter, In-orbit parameter calibration, Parameter measurement model, Continuous low thrust, Autonomous navigation, Spacecraft