提升小波变换的部分残差相位模拟与去除

Part of residual phase simulation and purify based on the lifting wavelet transform method

为了修正轨道残留误差和大气误差的线性趋势项部分,有效改善解缠相位图的质量,该文根据小波变换可以实现分频这一重要特征,将其引入到合成孔径雷达干涉测量(InSAR)技术相位分离中;利用提升机制二维小波变换方法将解缠后的残余相位进行分解,并将低频部分在小波域内进行提取并估计修正,继而将纠正后的低频相位与高频相位进行重组。结果表明:针对解缠相位轨道残留误差和大气残留误差的线性趋势项部分,可以采用提升二维小波变换方法进行模拟和修正,该方法可以去除大量残差点,有效改善解缠相位图的质量。

To correct linear trend part of orbit residual error and atmospheric error,effectively improve quality of phase diagram,the wavelet transform was introduced into the interferometric synthetic aperture radar(InSAR)phase separation technique in this paper,for it can realize frequency division.The unwrapping residual phase was decomposed by the method of lifting wavelet transform,low-frequency phase in the wavelet domain was extracted and corrected.Finally corrected low-frequency phase and high frequency phase was reconstructed.The results showed that:linear trend part in orbit residual error and atmospheric residual error of unwrapping phase could be effectively estimated and corrected by the lifting wavelet transform method,large residual points were removed and the quality of unwrapping phase diagram was improved.