摘要
提出了影响周视搜索系统对点目标的作用距离的具体参数,从目标特性、大气背景特性及系统本身光机电特性等角度推导了作用距离的数学公式,针对点目标,分别基于靶面照度、靶面对比度、探测概率、虚警率及系统带宽等参数推导了一定目标、大气及系统特性条件下周视搜索系统的作用距离的计算公式。该公式分析表明目标辐射强度与作用距离呈近似上升抛物线关系,大气消光系数与作用距离呈下降段抛物线关系,系统焦距与作用距离呈正比关系,目标固有对比度与作用距离呈非线性关系。针对给定虚警率的特定搜索任务,系统信噪比与作用距离呈近似下降段抛物线关系,系统驻留时间则与作用距离呈近似正比关系。最后通过仿真实验证明。当目标辐射强度值达70 J/(s·sr),目标固有对比度达到4以上且大气消光系数在0.1以内时,500mm焦距的周视可见光搜索系统对点目标的作用距离达100 km以上,周视红外搜索系统对点目标的作用距离达60 km以上。
The maximum detection range equations of the infrared panoramic searching system are investigated, based on the focal plane irradiance distribution, the minimum resolved contrast, detection probability, false alarm probability and the bandwidth. The main factors including the target characteristics, atmosphere background, and the optical, mechanical and electrical characteristics of the systems are analyzed. In the equation of detection range based on the irradiance distribution, the results show that the radiation propagation intensity of target has approximate ascending parabola relation with detection range, atmosphere extinction coefficient has descendent parabola relation with detection range, the system focus has direct proportion with detection range, and the inherent contrast of the target has ascending parabola relation with detection range. Given the definite false alarm probability, the signal noise ratio has approximate descendent parabola relation with detection range, while detector dwell time has approximate direct proportion relation. The system detection distance under the above factors are simulated ,and the results show that the detection range of panoramic visible light searching system can achieve more than 100 km, panoramic infrared searching system can achieve more than 60 km with the target radiation propagation intensity of 70 J/（s ~ sr）, the connatural contrast of more than 4, atmosphere extinction coefficient of less than 0.1 and the system focus of 500 mm.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第4期937-943,共7页
Acta Optica Sinica
关键词
光学测量
搜索
点目标
作用距离
optical measurement
searching
point target
detection range
