灰度漂移是地基中波红外测量系统标定和测量的主要误差来源之一。通过研究外场辐射标定时环境温度对中波红外测量系统输出灰度的影响，发现了灰度随环境温度漂移的规律，找到了灰度漂移的原因，推导了环境温度与灰度漂移的关系，提出了基于环境温度的灰度漂移补偿方法。实验结果表明，文中所提方法能有效补偿红外测量系统的灰度漂移量，降低中波红外测量系统受环境温度变化引起的灰度漂移。

When using ground-based medium wave infrared measurement system, gray value drift is one of the significant errors in radiation calibration and measurement. By investigating the dependence between the ambient temperature with the output gray value of infrared system, the law of gray drift with ambient temperature was summarized, the reason of gray drift was found, the relationship between ambient temperature and gray drift was deduced, and a method based on ambient temperature was proposed to compensate the gray value drift. The results indicated that the method in this paper can compensate gray value drift effectively and reduce the gray value drift caused by ambient temperature.