基于LED光源的运动式太阳模拟器控制系统

为了解决编码式太阳敏感器装星后现场的功能测试，研制了一种基于LED光源的运动式太阳模拟器，为该测试提供模拟的太阳光信号和太阳光矢量信号.基于太阳模拟器组成与工作原理，对光源辐亮度和矢量运动的控制系统进行研究.根据太阳光信号要求，通过光源选取与功率计算确定LED型号和个数，并采用压控恒流源驱动技术对光源辐亮度进行线性调节.根据太阳光矢量信号要求，通过负载扭矩与功率计算选取GUS-60型超声电机，采用16位绝对式编码器对运动角度进行测量，以数字信号处理器为主要器件对电机进行闭环反馈控制.测试结果表明，光源控制系统能够实现辐亮度在0～527.4W·m-2内线性可调，矢量运动装置在-15°～40°内的运动角度控制精度优于±0.01°，满足编码式太阳敏感器的测试要求. 

Control System of Mobile Solar Simulator Based on LED Light Source

A mobile solar simulator based on the LED light source is developed to provide simulated sunlight signal and sunlight vector signal. The simulator can be applied to the function test of the field after the installation of the coded solar sensor. Firstly, the structure and working principle of the mobile sunlight simulator are introduced. The control system of the radiance and vector motion of the light source is studied. Secondly, according to the requirements of the sunlight signal, the model and number of LEDs are determined by the light source selection and power calculation. The radiance of the light source is linearly adjusted by the voltage controlled constant current source driving technique. Finally, according to the requirements of the sunlight vector signal, the GUS-60 ultrasonic motor is selected by the load torque and power calculation. The 16-bit absolute encoder is used to measure the moving angle. The digital signal processor is used as the main component to perform closed-loop feedback control of the motor. The experimental results showed that the light source control system could perform linear adjustment within the radiance range of 0~527.4W·m-2. The motion control accuracy of the vector motion device was better than ±0.01° as the motion angle is from -15° to 40°. The mobile solar simulator can help to complete the field test of coded solar sensors.