【作者】 李力； 董臻；

【Author】 LI Li,DONG Zhen School of Electronic Science and Engineering,National University of Defense Technology,Changsha 410073,China

【机构】 国防科技大学电子科学与工程学院；

【摘要】 VHF/UHF、P波段SAR在全球生物量监测等方面的应用正在引起越来越多的兴趣。这些频段因其良好的植被穿透能力而具有广泛的应用前景;同时这些波段的星载SAR由于受到电离层的影响,难以实现高分辨率。分析了电离层对星载SAR的影响,提出了双频方法,通过估计路径电子总量(TEC)补偿电离层对距离向SAR信号的误差相位。结合方位向的PGA技术,实现了VHF/UHF、P波段SAR两维高分辨成像。仿真结果验证了该方法的有效性。更多还原

【Abstract】 There has been increasing interest in global measuring forest biomass using SAR operating at VHF/UHF and P band.These bands have a wide application future for having the capability of penetrating vegetation and foliage;while high resolution space-borne SAR in these bands can hardly achieved because of the ionospheric affects.In this paper,the affects of ionosphere on space-borne SAR are analyzed,a dual-frequency method is proposed.This method estimates the Total Electron Contents(TEC) to compensate the phase error in range signal caused by the ionosphere.With the companion of PGA technology in the azimuth direction, 2D high resolution imaging of the VHF/UHF and P band space-borne SAR can be achieved.Validity of the method is confirmed by simulation.更多还原