摘要
在目前的空间指向镜位置伺服系统中,数字控制器输出脉宽调制(PWM)的量化误差会导致指向出现小幅角度振荡,使得指向的稳定性降低,进而导致光学遥感成像质量发生退化。针对航天器工程实现的特点,将Delta-Sigma调制器引入到数控软件中,在不改变硬件电路与系统参数的前提下,显著的降低了输出量化误差对伺服系统的影响。Matlab仿真结果表明,该方法可使指向镜的指向角度振荡幅值衰减至原来的1/5以下,有效地提高了指向镜的指向稳定性。
The quantization error of DPWM causes slight angle oscillation and stability decrease in pointer mirror position servo system, which results in degradation of optical imaging quality in space remote sensor. On the premise of changing no circuit and system parameters, Delta-Sigma modulator is applied to the software of products in this paper, which significantly lessens the impact of DPWM quantization error on the servo system. A Matlab simulation of pointer mirror position servo system is presented, with the result of more than 5 times attenuation of the amplitude of the angle oscillation by using Delta-Sigma modulator.
出处
《航天返回与遥感》
2014年第5期54-60,共7页
Spacecraft Recovery & Remote Sensing
关键词
三角积分调制器
指向镜
伺服系统
量化
空间遥感
Delta-Sigma modulator
pointer mirror
servo system
quantization
space remote sensor
