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提出并分析了基线抖动造成的干涉SAR相位误差模型。基于干涉SAR基线抖动模型,分为水平抖动和垂直抖动,推导了存在基线抖动情况下辅天线复图像信号模型及基线抖动带来的干涉相位误差公式,分析了基线抖动对成像质量和干涉相位的影响,针对SRTM系统进行了计算机仿真。通过基于基线抖动的干涉SAR原始回波数据计算,仿真了点目标和面目标场景的回波信号,并进行成像得到了复图像和干涉条纹,仿真结果验证了理论分析的正确性。
The model of phase error caused by baseline jitter is proposed and analyzed. Based on the model of baseline jitter interference SAR, the model is divided into horizontal jitter and vertical jitter. The formulas of interferometric phase error caused by the complex image signal model and baseline jitter in the presence of baseline jitter are deduced. The influence of baseline jitter on the imaging quality and the phase of interference Impact, Computer Simulation for the SRTM System. The original echo data of the interferometric SAR based on the baseline jitter is calculated and the echo signals of the point target and the surface target are simulated. The complex image and the interference fringes are obtained by imaging, and the simulation results verify the correctness of the theoretical analysis.