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基于MME/KF的電推進(jìn)器推力在軌標(biāo)定算法

On-orbit electric thruster calibration based on MME/KF algorithm

  • 摘要: 為了確保小推力量級(jí)電推進(jìn)器在軌工作的有效性，提出了一種基于MME/KF（Minimum Model Error/Kalman Filter）的電推進(jìn)器推力在軌標(biāo)定算法。該算法對(duì)推力標(biāo)定過程為：首先使用飛輪產(chǎn)生一個(gè)已知的周期性力矩作用于衛(wèi)星上，同時(shí)姿態(tài)控制器發(fā)送指令給電推進(jìn)器來保持衛(wèi)星的穩(wěn)定；然后將陀螺儀數(shù)據(jù)代入MME算法中估計(jì)出衛(wèi)星的角加速度，并利用KF算法實(shí)現(xiàn)電推進(jìn)器在軌標(biāo)定；最后進(jìn)行數(shù)學(xué)仿真。結(jié)果表明該算法在常規(guī)推力下可以提高在軌標(biāo)定精度，并且可以實(shí)現(xiàn)小推力條件下的在軌標(biāo)定。

     

    Abstract: To ensure the on-orbit working precision of the electric thruster, an approach for on-orbit electric thruster calibration based on MME/KF algorithm is proposed in this paper. This approach includes three steps. First, the electric thrusters are dictated by an on-board control system to stabilize the satellite attitude while a periodic torque is imposed on the satellite from a reaction wheel. Secondly, the observation of gyro is used to estimate the angular acceleration based on MME algorithm. Thirdly, KF algorithm is used to calibrate the electric thruster. The numerical results indicate that the proposed approach can improve the calibration precision of the thruster not only in the general thrust, but also in the micro-thrust.

     

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