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为了精确测量航天器对接过程中最终逼近段航天器间的滚转角,设计了基于方波磁光调制的滚转角测量系统。利用法拉第磁致旋光效应并结合马吕斯定律,建立了方波磁光调制后输出信号的模型;通过分析输出信号的特点,推导了输出信号与滚转角之间的关系方程;利用滚转角变化过程中输出信号的增减性组合去除了方程的增根,最终得到了基于方波磁光调制的滚转角测量模型。仿真结果表明:文中提出的方法理论测量精度高,可测量-90～90°间的滚转角,优于传统方法。此外,利用方波信号调制具有数据采集简单、信号处理难度低等优势,是实现高精度大范围测量航天器间滚转角的一种新方案。
In order to accurately measure the roll angle of spacecraft in the final approximation of the spacecraft docking process, a roll angle measurement system based on square wave magneto-optical modulation was designed. By using Faraday magneto-optic effect combined with Marius’s law, a model of square wave magneto-optical modulated output signal is established. By analyzing the characteristics of the output signal, the relation equation between the output signal and roll angle is deduced. In the process, the combination of the addition and subtraction of the output signal removes the increasing root of the equation, and finally obtains the roll angle measurement model based on the square wave magneto-optical modulation. The simulation results show that the method proposed in this paper has the advantages of high measurement accuracy, measurable rolling angle from -90 ° to 90 °, which is superior to the traditional method. In addition, the use of square wave signal modulation has the advantages of simple data acquisition and low signal processing difficulty, and is a new solution for high-precision and large-scale measurement of the roll angle between spacecraft.