天基可见光相机探测灵敏度研究

Research on Detection Sensitivity of Space-Based Visible Sensor

随着遥感技术的发展,对载荷的性能提出愈来愈高的要求,特别是载荷的探测灵敏度,直接关系到能否探测到目标。如何满足和提高探测灵敏度,成为研制高性能遥感设备设计中的一个重要问题,从光度学和辐射度学原理出发,对空间目标探测信号的强度进行分析、计算。基于目标与噪声的数学表达式,根据经典检测理论推导出天基可见光(SBV)相机的探测灵敏度模型的数学表达式。将美国SBV相机参数代入该模型后,计算得到的灵敏度结果(15.55视星等)与设计指标(15.5视星等)只相差0.05视星等。由此可见该探测灵敏度模型具有相当的精度,可为天基可见光相机的研究设计提供理论参考。

Along with the development of remote sensing technique,performance demands of load become higher and higher.Especially the detection sensitivity of load is related to the ability of detecting target.How to meet and increase detection sensitivity of load is becoming a problem of developing high-performance remote sensing device.Based on the theories of photometry and radiometry,space target detection signal intensity is analyzed and calculated.According to classical detection theory,the model of detection sensitivity of space-based visible（SBV） sensor is derived based on the mathematical expression of target and noise.By substituting American SBV sensor parameters into the model,the error between calculation result（15.55 visual magnitude） and design specification（15.5 visual magnitude） of detection sensitivity is only 0.05 visual magnitude.This shows that the detection sensitivity model has considerable accuracy,and will provide a theoretical reference for space-based visible sensor research and design.