星载差分吸收光谱仪摆镜控制系统设计

针对差分吸收光谱仪搭载于地球同步轨道卫星时对地成像的要求, 设计了一种扫描摆镜转动控制系统。从摆镜控制结构设计、控制电路设计两个方面阐述了摆镜系统的方案。摆镜系统受载荷主控器控制, 接收控制指令并回传当前摆镜位置状态,通过LMD18200驱动芯片进行功率输出,由步进电机和谐波减速器构成的驱动器驱动摆镜转动, 编码器读取摆镜角度信息。给出了PWM(Pulse Width Modulation)波占空比的测定办法, 并提出通过回转到成像起始点之前的方式, 消除回程误差对成像区域步距不确定性的影响。实验结果表明该系统的步距角均值偏差小于1″, 最大偏差小于5″,标准偏差小于2″。该光谱仪摆镜控制系统满足步距精度指标要求。

Abstract

To meet the requirement of step accuracy for the scanning mirror of a Differential Optical Absorption Spectroscopy (DOAS) mounted on a geosynchronous orbit satellite, the design of a scanning mirror control system with high accuracy is proposed that specifically considers structural and circuit design aspects. In this scheme, the scanning mirror system was controlled by the master controller that received instructions and sended back information about the current position of the scanning mirror. The scanning mirror controled circuit outputs power through the LMD18200 driver chip. Then, the driver consisting of a stepping motor and harmonic reducer drived the scanning mirror to rotate, and the encoder readed the position information of the scanning mirror. In this study, a method of setting the duty cycle of the PWM was proposed, and the control and elimination methods of the harmonic gear transmission hysteresis were studied. Experimental results show that the mean deviation of the step angle of the system is less than 1″, the maximum deviation is less than 5″, and the standard deviation is less than 2″. This control system design satisfies the requirements of step accuracy for the scanning mirror and provides a reference for related applications on subsequent satellite payload.

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