顺轨干涉SAR浅海地形成像建模及其最优雷达观测参数分析

该文基于浅海海流动力模型、波流交互模型、后向散射模型以及Doppler谱模型对顺轨干涉SAR浅海地形成像进行了建模.利用建立的成像模型,在准1维近似的条件下对不同雷达频率、入射角、顺轨基线长度以及极化方式等参数对顺轨干涉SAR浅海地形成像的影响进行了探讨.在成像延时低于海面去相关时间的前提下,高频率、大入射角以及长顺轨基线条件比较适合于顺轨干涉SAR浅海地形成像;而极化方式对顺轨干涉相位变化的影响不大,如果综合考虑信噪比等因素的影响,VV极化仍是顺轨干涉SAR浅海地形成像的首选极化方式.

Shallow Sea Topography Imaging Model by Along-track Interferometric SAR and Its Optimal Radar Parameters Analysis

In this paper, a simulation model of shallow sea topography imaging by Along-Track Interferometric SAR (ATI-SAR) is developed based on shallow sea current dynamical model, wave-current interaction model, backscattering model and Doppler spectrum model. This simulation model is used to study the influence of radar parameters (frequency, incidence angle, baseline length and polarization) on shallow sea topography imaging by ATI-SAR under quasi-one-dimension condition. The simulation results indicate that high frequency, large incidence angle and long along-track baseline are favorable to shallow sea topography imaging by ATI-SAR when the imaging time lag between two antennas is shorter than the de-correlation time of the sea. Considering the influence of Signal-to-Noise Ratio (SNR), VV is a favorable polarization for shallow sea topography imaging, though the ATI phase may be not sensitive to the polarization.