在航天、**等领域往往需要传递无机械连接的设备之间的空间方位信息，而传统的方位测量系统测量范围小、测量精度低，难以满足系统高精度大范围传递的要求，为此改变传统方法中的调制方式，将方波磁光调制引入了方位测量系统，建立了基于方波磁光调制的方位测量模型。根据马吕斯定律，建立了方波磁光调制后的输出信号模型，并分析了调制后信号的特点。根据调制后信号的表达式与方位角的关系，推导、建立了调制后信号与方位角之间的关系方程，并利用调制后信号的增减性去除了方程的增根，结合调制前后信号的相位对比扩大了方位角的测量范围，最终得到了基于方波磁光调制的方位测量模型，实现了无机械连接的设备之间方位信息的传递。仿真结果表明，提出的基于方波调制的测量方法与传统方法比较，理论测量精度更高、测量范围更广，这为实现空间方位角高精度大范围测量提供了一种参考。

The technique of transmitting spatial azimuthal information between equipments without mechanical connection is important in spaceflight, military and other fields. The precision of the traditional azimuth measurement system is low, and the measurement scale is narrow, so the traditional azimuth measurement system cannot meet the requirement of transmitting the azimuth in high precision and wide scale. The modulation wave of the traditional method is transformed, the square wave magneto-optic modulation is introduced into the azimuth measurement system, and the azimuth measurement model based on square magneto-optic modulation is established. The model of modulated signal is presented according to Malus law, and its characteristics are analyzed. The equation between azimuth and modulated signal is established according to their relationship, and the variation trend of modulated signal is used to delete the equation′s extraneous roots. The phase comparison of modulation signal and modulated signal is used to widen the azimuth measurement scale. At last the azimuth measurement model based on square wave magneto-optic modulation is acquired, realizing the transmission of azimuth between equipments without mechanical connection. Simulation results show that compared with the traditional method, the theoretical measurement precision of the new method is higher, and the measurement scale is wider, which provides a reference to measure azimuth in high precision and wide scale.