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.