激光光斑是激光制导**干扰半实物仿真系统中目标特性模拟的重要组成部分。介绍了半实物仿真系统组成和激光导引头工作原理；研究了基于相似性原理采用等比例缩放的光斑模拟方案；利用LightTools 建立了导引头光学系统模型，计算了不同制导时刻内外场光斑在探测器光敏面上的光斑尺寸；基于激光制导**干扰半实物仿真系统实际需求，提出了光斑模拟优化方案。研究发现，半实物仿真条件下，导引头光敏面上形成的光斑比外场条件下要大，并且变化规律也不一致；随着距离目标越来越近，漫反射屏上光斑越来越大，导致导引头光敏面上光斑也越来越大。研究结果有助于提高光斑模拟精度和激光制导**干扰半实物仿真系统可信度。

Laser spot simulation is the important part of target characteristic simulation in hardware-in-the-loop (HITL) simulation system for laser guided weapon jamming. The HITL system composition and laser seeker theory are introduced. Laser spot simulation scheme based on correspondent ratio scaling in similarity theory is shown. Optical system model of laser seeker is established by LightTools, and the sizes of laser spot on detector′ s photosensitive surface in infield and outfield are calculated in different guided time. Laser spot simulation optimization methods based on HITL simulation system for laser guided weapon jamming are proposed. The research result indicates that under HITL condition the size of laser spot on detector′s photosensitive surface is bigger than that in outfield environment, and their changings are not the same. With the distance from the target decreasing, the size of laser spot on diffuse reflectance screen increases and this leads to the increase of laser spot on detector′s photosensitive surface. The result is helpful to improve the precision of laser spot simulation and the reliability of HITL simulation system for laser guided weapon jamming.