IRFPA两点校正的定标温度选择方法研究及实现

The Research and Realization of Calibration Temperature Selection on Two-point Non-Uniformity Correction

针对非均匀性两点校正方法中精度不足、动态范围小的问题,首先研究焦平面探测器的实际响应模型"S"模型,分析介绍了两点校正算法原理,然后,阐述了黑体定标温度的选择和两点校正方法中的精度、动态范围之间的关系,并提出了基于二分法的定标黑体温度选择方法,最后,在实验中,通过FPGA和DSP硬件电路实现算法功能。实验验证,该方法在保证了两点校正的实时性高、算法简单的优点的同时,提高了两点校正的精度,扩大了其动态范围。

In view of the lack of precision and small dynamic range in two-point non-uniformity correcnon, firstly, we research on the ＂S＂ model of the actual response of the focal plane detector and introduce the method of two-point correction. Then, the relationship between the selection of the calibration temperature and the accuracy and the dynamic range is elaborated, and the calibration temperature selection method based on dichotomy is proposed. At last, the proposed method is realized by FPGA and DSP. It is proved that this method ensures the advantages of real-time processing and simple algorithm while improving the accuracy of the Two-point correction and enlarging dynamic range.