高分辨率SAR辐射定标中的空间尺度效应影响和定标方法研究

为了更准确描述目标散射信息，提高辐射定标精度，本项目以高分辨率SAR辐射定标中的空间尺度效应及定标方法为研究对象，重点研究定标参考目标散射特性的空间尺度效应，空间尺度效应对传统辐射定标模型影响与及定标方法，辐射定标结果的空间尺度效应和尺度转换。从微波散射机理和成像机理分析定标参考目标散射特性的尺度效应产生原因，并进行校正；建立高分辨率辐射定标模型，解决小空间尺度下传统辐射定标模型不准确的问题；分析辐射定标结果的空间尺度效应，建立尺度转换关系，解决定标的“点观测”结果与定量遥感应用的“面观测”之间的不一致问题；探索高分辨SAR目标频率和角度相关性散射特性的微波谱表征方式和方法，解决高分辨率SAR在空间分辨率获得提升时带来的辐射信息模糊问题。从而为我国高分辨率SAR系统研制、成像处理、SAR数据的定量遥感应用提供理论和技术支撑。

To descirbe target scattering information more accurately, and improve the resolution of Radiometric calibration,the proposal focuses on the influence mechanism of spacial scale effect on high resolution SAR radiometric calibration and new calibration method. The main research topics include: spacial scale effect on scattering properties of calibration referenc targets, and it’s influence on traditional radiometric calibration model, spacical scale effect on calibration results and scale transforamtion method. Analysis the orgin of spacial scale effects from views of scattering mechanism and imaging mechanism, and the calibration of reference targets. Establish high radiometric calibration model to overcome the inaccuracy of traditional calibration model. Analysis the spacial scale effect of calibration results and establish scale transformatin effects, and resolve the disagrement between “piont observation” calibration results and “area observation” in quantitve remote sensing apllicaitons. Explore new microwave spectra characterization manner and methods, and resolve the bluring problem on radiometric informtion with the improvement of spacial resolution in high resolution SAR. This work will be can an aid for the low frequency airborne/spaceborne high resolution SAR system design, SAR data processing methods validation, and high resolution SAR data applications in quantitative remote sensing.