摘要
海表红外辐射及其变化是进行全天时海事活动(如水下目标运动特性)监测的重要因素,随着应用的深入,对探测灵敏度需求越来越高。提出了一种高灵敏度海洋热红外遥感技术,引入综合时间噪声和空间噪声影响的时空NETD指标进行性能评价。通过像素级数字积分探测技术,提高系统的电荷处理能力,使时间NETD提高到毫开量级;通过基于场景的自适应非均匀性校正技术,抑制非均匀性对辐射分辨率的衰减,使残余空间噪声接近或小于时间噪声水平。基于成像全链路信噪比模型进行仿真分析,最终实现了时空NETD优于10mK,为海表红外辐射及其变化的高灵敏度探测提供可靠遥感图像。
Radiation and its changes from ocean surface are important factors to analyze marine activities over all-day,such as underwater targets movements.Higher radiometric resolution was needed urgently with the deepening of application.An ocean infrared detecting method with ~mK NETD was presented.Pixel-level digital integral technology was introduced to improve the ability of handling charges to 109e-.By SNR model analysis along whole imaging chain,temporal NETD could reach up to millikelvin scale.Scene-based non-uniformity correction was adopted to restrain the spatial noise to temporal noise level.Results show that excellent performance with low space-time NETD could be acquired.
出处
《光学与光电技术》
2017年第1期59-63,共5页
Optics & Optoelectronic Technology
基金
总装备部探索项目(71×××××)资助项目
关键词
热红外
高灵敏度
时间噪声
空间噪声
非均匀性校正
thermal infrared
high sensitivity
temporal noise
spatial noise
nonuniformity correction
