由于卫星星体结构热变形以及机械振动的影响，高精度载荷指向相对于精度基准会发生小角度的相对转动。在此背景下，本文提出了基于激光位置敏感器(PSD)技术的载荷指向角度测量方法，并研制了测量系统原理样机。该方法使用了有夹角双光束，并且是双光源、双反射镜、双传感器，可以使得测量装置结构紧凑、体积小、质量轻，布局位置灵活。样机实验结果表明，测量装置能够适用于卫星应用，满足载荷指向的转角测量需求。

As a result of the thermal deformation and mechanical vibration on satellite structure, the payload’s pointing regarding to the precision standard will be rotated with a small angle. In this background, a measurement method based on laser Position Sensitive Detector (PSD) technology for this purpose was suggested and a prototype was developed. This method uses unparallel double-beams, double light sources, double mirrors, and double sensors. And the measuring device has compact structure, small volume, light weight, and flexibility for layout. This experiment result shows that the measuring system is very suitable for satellite application and can meet the measurement requirement.