四象限探测器对目标的测角精度直接影响激光制导**的制导精度，因此研究四象限探测器测角精度十分重要。采用计算和仿真分析的方法，基于导引头入瞳处脉冲峰值功率密度服从均匀分布，噪声干扰电流服从高斯分布，建立了激光导引头光束偏转角误差模型；但由于噪声干扰使光束偏转角误差具有随机概率性，所以将光束偏转角误差的均值和标准差作为四象限探测器测角精度的衡量标准，分别建立了光束偏转角误差的均值和标准差与导引头光学系统参数、光斑半径、漫反射激光入射角、噪声干扰电流以及导引头入瞳处脉冲峰值功率密度之间的关系，并以导引头光束偏转角误差标准差为例，结合应用背景进行了仿真分析。

The accuracy of the four-quadrant detector on the target directly affects the guidance precision of the laser guided weapon. Therefore, it is very important to study the accuracy of the four-quadrant detector. In this paper, the method of computation and simulation analysis was adopted, based on the uniform distribution of the pulse peak power density at the entrance of the seeker, and the noise interference current obeyed the Gaussian distribution, and the beam deflection angle error model of the laser seeker was established; however, the beam deflection angle error had random probability due to noise interference, so the mean and standard deviation of the beam deflection angle error were used as the measurement of the four-quadrant detector angle measurement accuracy. The relationship was established between the mean and standard deviation of the beam deflection angle error and the optical parameters of the seeker, the spot radius, the incident angle of the diffuse reflection laser, the noise interference current, and the pulse peak power density at the entrance of the seeker. Taking the standard deviation of the deflection angle of the seeker beam as an example, the simulation analysis was carried out in combination with the application background.