双模型空中目标红外谱段的联合SNCR评估方法

Combining-SNCR evaluation of dual-models aerial targets’infrared bands

在天基平台下实现对空中飞机目标的探测,存在距离远、目标信号弱、背景杂波复杂和探测器噪声等不利因素,因此,要获取目标的最强信号,确定在探测过程中的谱段至关重要。为此系统性地建立了飞机羽流的梯形羽流和锥形羽流仿真模型,并提出了利用信噪比(SNR)和信杂比(SCR)联合的SNCR方法对空中目标的探测谱段进行确定。实验结果表明:针对空中目标,不同目标SNCR值不同,但峰值区域不变,由此方法可以确定探测谱段,最终确定探测的谱段分别为:中波波段为3.7~4.15μm,波段间隔在0.3μm以上;长波波段为8~12μm,波段间隔在0.35μm以上。

The detection of the aerial targets applied on the space-based platform has disadvantages of long distance,weak signal of targets,complex background clutters and detector noises.Therefore,to obtain the strongest signal of the target,it is crucial to determine the bands used during the process of detection.The trapezoidal plume and the cone plume simulation model are systematically established,meanwhile an SNCR method combining the signal to noisy ratio(SNR)and the signal to clutter ratio(SCR)is proposed to determine the detection bands.The experimental result shows that,different aerial targets have different SNCR values,but with the same peak value.According to the method mentioned above,bands have been determined and eventually the values are as follows:3.7~4.15μm in MWIR band in which interval is not less than 0.3μm,8~12μm in LWIR band in which interval is not less than 0.3μm.