中波红外系统探测能力计算方法

Medium Wave Infrared System Detection Capability Calculation Method

为准确核算中波红外系统的探测能力,对背景限制条件下的红外系统极限作用距离计算公式进行了推导,结合黑体测试结果,进一步推导出了含有黑体和目标的辐射强度、大气透过率、背景辐射亮度的红外系统探测距离表达式。利用大气透过率以及背景辐射亮度计算软件MODTRAN,采用二分法,使得计算结果快速收敛逼近真值。据此编制了中波红外系统探测能力计算软件,软件不仅能够对固定指向单点探测能力进行计算,还可以绘制红外系统探测能力随仰角变化的曲线图,具有一定的推广应用价值。

In order to accurately calculate the detection capability of medium-wave infrared systems, the formulas for calculating the limit distances of infrared systems under background conditions are deduced. Combined with the results of blackbody tests, the infrared system detection distance expressions including the radiation intensity, atmospheric transmittance, and background radiance of the black body and the target are further deduced. Using the atmospheric transmittance and the background radiance calculation software MODTRAN,the dichotomy method is used to make the calculation converge to the true value quickly. Based on this, a software for calculating the detection capability of medium-wave infrared systems is developed. The software can not only calculate fixed-point single-point detection capability, but also draw a graph of infrared system detection ability with elevation angle, which has certain popularization and application value.