红外探测器模拟器中多通道数模转换输出不一致性校正

针对多通道数模转换电路输出不一致性问题,将两点非均匀性校正算法引入到不一致性问题中,提出了一种不一致性两点校正模型。通过分析红外探测器模拟器输出信号的样本数据,获得不一致性校正因子,并在现场可编程门阵列核心处理器中实现了该不一致性校正模型。利用红外探测器模拟器模拟320×256中波红外制冷探测器的输出信号,获得不一致性校正前后的图像。通过比较分析表明:校正前图像列平均灰度最大起伏量为15,校正后为5,相对改善了约66.7%。

Inconsistency correction of multi-channels digital to analog conversion circuit output in infrared detector simulator

The inconsistency of multi-channels digital to analog conversion circuit output seriously affects the simulation quality of the infrared detector simulator. In order to solve this problem, a novel method called two-point inconsistency calibration model (TICM) is proposed by introducing a two-point non-uniformity correction algorithm into the inconsistency problem. By analyzing the sample data of the infrared detector simulator, correction factors are obtained, and the TICM is implemented on the core processor FPGA (field-programmable gate array). The images before and after inconsistency correction are obtained by simulating the output signal of 320256 mid-wave infrared cooling detector. The result shows that the maximum fluctuation of the column average gray level is up to 15 initially, but after the inconsistency correction, it decreases to 5. There is about a 66.7% increase in output performance by using TICM. Thus, the established inconsistency calibration model is a good solution to the inconsistency problem of multi-channels digital to analog conversion circuit output and provides a foundation for quantitative simulation of the infrared detector simulator.