星载微波辐射计通道分辨率匹配技术及其在FY-3卫星MWRI中的应用

Study of Channel Resolution Matching of Spaceborne Microwave Radiometer and Its Application in MWRI of FY-3 Satellite

基于仿真模型对圆锥扫描星载微波成像仪不同频率和极化二维天线方向图地面足迹的模拟,对FY-3卫星微波成像仪(MWRI)原始观测轨道亮温数据,用Backus-Gilbert(BG)分辨率匹配算法分别对分辨率降低(高频通道匹配到低频通道)和分辨率增强(低分辨率匹配到高分辨率)进行了实验分析。结果表明:分辨率降低匹配处理能较好地模拟实际仪器观测,且不另引入噪声,可在MWRI通道分辨率匹配中实际应用;分辨率增强匹配可明显提高低频图像分辨率,但会一定程度引入噪声,实际应用中应考虑在分辨率增强与噪声间进行折中处理,在增强分辨率的同时,使引入的噪声在可接受范围内。

Based on the simulation of the ground footprint with various frequency and polarization two-dimension pattern of space-borne microwave radiation imager （MWRI） with corn scanning by the model, the Backus-Gilbert resolution matching algorithm was used to the experiment of resolution decreasing （from high frequency channel to low frequency channel） and resolution increasing （from low frequency channel to high frequency channel） for Bright temperature data of MWRI for FY 3 satellite in this paper. The results showed that the matching with resolution decreasing could simulate the real instrument observation without introducing noise, which could be applied in the channel resolution matching of MWRI, the resolution of low frequency image could be improved by the resolution increasing matching but with introducing some noise. The compensation should he considered between the resolution increasing and noise in real application, which made the noise introduced acceptable while the resolution increased.