The purpose of this paper is to present a novel high-precision relative navigation method for tight formation-keeping based on thrust on-line identification.
Considering that thrust acceleration cannot be measured directly, an on-line identification method of thrust acceleration is explored via the estimated acceleration of major space perturbation and the inter-satellite relative states obtained from space-borne acceleration sensors; then, an effective identification model is designed to reconstruct thrust acceleration. Based on the identified thrust acceleration, relative orbit dynamics for tight formation-keeping is established. Further, using global positioning system (GPS) measurement information, a modified extended Kalman filter (EKF) is suggested to obtain the inter-satellite relative position and relative velocity.
Compared with the normal EKF and the adaptive robust EKF, the proposed modified EKF has better estimation accuracy in radial and along-track directions because of accurate compensation of thrust acceleration. Meanwhile, high-precision relative navigation results depend on high-precision acceleration sensors. Finally, simulation studies on a chief-deputy formation flying control system are performed to verify the effectiveness and superiority of the proposed relative navigation algorithm.
This paper provides a reference in solving the problem of high-precision relative navigation in tight formation-keeping application.
This paper proposes a novel on-line identification method for thrust acceleration and shows that thrust identification-based modified EKF is more efficient in relative navigation for tight formation-keeping.
The authors are grateful for the support provided for this study by the National Natural Science Foundation of China (No.11502142).
Zhu, W., Zhang, D., Wang, J. and Shao, X. (2017), "A novel relative navigation method based on thrust on-line identification for tight formation keeping", Aircraft Engineering and Aerospace Technology, Vol. 89 No. 3, pp. 406-414. https://doi.org/10.1108/AEAT-10-2015-0224
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