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依据目标成像辐射通量变化与距离的关系,针对典型空中目标成像的特点,提出一种适合中波红外鱼眼凝视系统的被动测距方法。在红外鱼眼系统探测范围内,空中目标理想成像面积远小于单个像元面积,因而,背景估算时忽略目标对背景的遮挡,从采集图像与背景的差值中估算焦平面接收的光斑总体辐射通量。目标的红外辐射受到大气中传输衰减,短时间测量时环境变化很小,通过Modtran软件计算得到当时的大气衰减系数。该方法在初始距离已知的前提下,通过计算目标成像光斑辐射通量与初始距离时成像光斑辐射通量的比值,得出当前时刻目标的距离。实验证明:该方法能对空中红外目标进行测距,通过序列帧计时可以估算目标的运动速度。
According to the relationship between the change of the target imaging radiant flux and the distance, aiming at the characteristic of the typical aerial target imaging, a passive ranging method suitable for the mid-infrared infrared fish-eye gaze system is proposed. In the detection range of the infrared fisheye system, the ideal target area of the aerial target is much smaller than the area of a single pixel. Therefore, the target is ignored to obscure the background from the target, and the difference between the collected image and the background is used to estimate the total spot radiation received by the focal plane Flux. The target’s infrared radiation is attenuated by the atmospheric transmission, the environmental change is very small when measured for a short time, and the atmospheric attenuation coefficient calculated by Modtran software at that time. Under the premise of the initial distance being known, this method obtains the distance of the target at the current moment by calculating the ratio of the radiation flux of the target imaging spot to the radiant flux of the imaging spot at the initial distance. Experiments show that this method can measure the distance of the infrared target in the air and estimate the moving speed of the target through the sequence frame timing.