摘要
为了反演获得准确的大气海洋参数,须要将星载微波辐射计分辨率不同的观测亮温进行分辨率统一的重采样处理。结合卫星的相关参数,使用渐削圆形口径和正轴等距投影的方式对星载微波辐射计的天线方向图进行仿真模拟。使用Backus-Gilbert方法对包含地理信息的模拟天线方向图以及AMSR-E真实数据进行观测亮温重采样试验,并分析了调整平滑参数时匹配误差和噪声参数两个关键指标的变化,得出选定的最佳平滑参数是当平滑参数从0向无穷大变化时,首次出现构造天线方向图非负的平滑参数。试验表明,目前常用的固定滤波分辨率匹配方法结果较好且计算效率高,具有一定的应用价值。
In order to obtain accurate atmospheric and oceanographic parameters,it is required to resample and process the brightness temperature observed by spaceborne microwave radiometer in unified resolution.Based on satellite parameters and by using gradually cut circular aperture,the antenna patterns of spaceborne microwave radiometer are simulated in positive axis equidistant manner.In our Backus-Gilbert resampling experiments,we used the simulated antenna pattern with geographic information and real AMSR-E data to analyze the impact of smoothing parameter on the change of two key items,fit error and noise factor,and determined the optimal smoothing parameter that is the first non-negative smoothing parameter appearing in configured antenna pattern when the smoothing parameter changes from 0 to infinity.The experiments indicate that the definite filter resampling technique which is often used currently can be used to get satisfactory results,high computational efficiency and application value.
出处
《航天器工程》
北大核心
2016年第2期145-152,共8页
Spacecraft Engineering
基金
国家自然科学基金面上项目(41276019
41076012)
海洋公益性行业科研专项(201305032)
广东省科技计划项目(2013B020200013)
