基于辐射标定的积分时间实时调整方法

Integral time real-time adjust method based on radiation calibration

积分时间调整是扩展红外辐射测量系统动态范围的主要手段,针对再入高速目标因辐射剧烈变化存在积分时间调整影响实时跟踪和图像饱和的问题,提出基于辐射标定的积分时间实时调整方法.该方法通过辐射标定得到不同积分时间的响应度和偏置,利用跟踪器提取的目标和背景信息计算光学入瞳处当前积分时间的目标和背景辐射;再反演计算其他积分时间的目标和背景信息,并以此计算跟踪判据,自动确定最佳积分时间.实验证明,该方法能准确预测满足跟踪要求的最优积分时间,有效减少测量过程中积分时间调整次数,目标连续跟踪正确率达100%.

The integral time adjustment is the primary means to extend the dynamic range of the infrared radiation measuring system. A real-time integral time adjustment method based on radiation calibration was put forward according to the radiation dramatic changes for the re-entry high-speed target, tracking affection and image saturation when integral time is adjusted. Radiation calibration can get the response and the bias of different integral time; the target radiance and the background radiance at the entrance pupil can be calculated by the target information and the background information. Then, the targets and the backgrounds signal value on the other integral time can be computed by the target radiance and the background radiance. The optimal integral time can be predicted by the tracking criterion. Experimental results show that the method can accurately locate the optimal integral time, reduce the number of integral time adjustment in the measurement process, and realize the target continuous tracking accuracy rate of 100%.