基于IAPES的分布式SAR高分辨成像  

Distributed SAR High-resolution Imaging Based on IAPES

作　　者：林超[1] 刘梅[1] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150001

出　　处：《现代电子技术》2011年第16期61-64,共4页Modern Electronics Technique

基　　金：航天科技创新基金(YY-F09021)

摘　　要：分布式SAR成像通常采用FFT估计信号频率参数,但其估计精度差且旁瓣高,在多目标的情况下会产生严重的相互干扰,降低成像质量。对此提出一种分布式SAR干涉幅度相位估计融合成像方法。该方法通过构造全局自适应FIR滤波器对分布式SAR信号进行分维滤波,同时应用干涉技术估计相位差完成相位校正,进而估计出带宽展宽的融合信号频谱,提高成像分辨率。而且IAPES频率估计精度高并能抑制旁瓣,从而精确估计目标的散射强度,达到改善成像质量的目的。实验仿真验证了该方法的有效性。The FFT is commonly used in distributed satellites SAR imaging system to estimate signal frequency parameters,but its precision is poor and sidelobe is high.Therefore,it may generate serious mutual interference under the multi-target condition and reduce image quality.In this paper,the IAPES（interferometric amplitude phase estimation） fusion imaging method fitting the distributed satellite SAR imaging system is studied to improve the imaging quality.IAPES fuses the signal from each satellite and estimates the broadened spectrum,which can improve the resolution.The fractal dimension filtering of the distributed SAR signal is conducted by structuring the global self-adaptive FIR filter.The interference technology is used to estimate phase error and achieve pgase correction.IAPES can estimate the scatter intensity of targets precisely.The simulation results proves that the method is effective and can improve the imaging resolution and quality.

关 键 词：分布式SAR IAPES 高分辨成像 频谱估计 

分 类 号：TN958-34[电子电信—信号与信息处理]