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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 simulated ground-based trajectories of the conical-scan spaceborne microwave imager with different frequencies and the polarization of the two-dimensional antenna pattern, the raw observed orbital temperature data of FY-3 satellite microwave imager (MWRI) ) The resolution matching algorithm experimentally analyzes resolution reduction (high frequency channel matching to low frequency channel) and resolution enhancement (low resolution matching to high resolution), respectively. The results show that the resolution reduction matching process can better simulate the actual instrument observation without introducing noise and can be practically applied in the resolution matching of MWRI channels. The resolution enhancement matching can obviously improve the resolution of low-frequency images, but to a certain extent The introduction of noise, the practical application should be considered between the resolution enhancement and noise compromise, while enhancing the resolution, the introduction of noise within the acceptable range.