Abstract:

Considering the disposability and thrust inaccurateness of a solid propellant micro-thrust array (SPMA), a thrust allocation method of SPMA based on thrust estimation and mixed integer programming is proposed. The thrust estimation is implemented with quadratic programming. The online thrust estimation and boundness of the thrust allocation error are guaranteed. The convergence performance of the estimation algorithm and the stability of the control system are also analyzed. The thrust allocation method is used to solve the thrust uncertainty problem of the thruster without modifying the control law. The stability analysis proves the ultimate boundness of the control system. The simulation results show that the method can compensate the influence of the thrust deviation on the control system, and can be applied to the micro-satellite formation keeping.

Key words: Thrust allocation, Solid propellant micro thrust array (SPMA), Thrust estimation