大气层电波传播对星载SAR方位分辨率的影响

利用合成孔径原理和大气折射理论推导了大气层给SAR方位向分辨率带来的误差公式,针对不同时间、地点、高低年的电离层电子浓度和低层大气折射率剖面,对不同频段进行了计算,并对计算结果进行了分析讨论.得出了大气层中星载SAR的方位向分辨率误差为毫米量级,其绝对值随频率增高而减小的结论. 

Atmospheric Radiowave Propagation Effects on Spatial Resolution of Spaceborne Synthetic Aperture Radar

Using the theory of synthetic aperture and atmosphere refractivity,the formulas of the azimuth resolution atmospheric error for spaceborne synthetic aperture radar are derived in this report.Using ionospheric electron density profiles and the lower atmospheric refractivity profiles of different time and places,the azimuth resolution is calculated for different frequencies.Simulation results are discussed and some conclusions are summarized that the atmospheric error of azimuth resolution is at millimeter level,and the absolute value will be reduced as frequency increases.