CAJ | 학술논문

干涉相位噪声的存在直接影响相位解缠的效果及最终干涉测量的精度。针对这一问题，本文提出了一种结合局部频率估计的小波域干涉合成孔径雷达（interferometric synthetic aperture radar，InSAR）相位滤波方法。根据局部频率估计可以判断出干涉相位小波系数中包含有用信息的子带。结合 VisuShrink 和 NeighShrink两种小波阈值收缩方法分别具有去噪效果好和细节保持能力强的特点，对有用信息所在子带的小波系数利用NeighShrink 方法进行阈值收缩，而对其他子带的小波系数则利用 VisuShrink 方法进行阈值收缩，从而尽可能地滤除噪声，同时保持干涉条纹的细节信息不被破坏。仿真和实测数据实验验证了本文提出的滤波方法的有效性。
간섭상위조성적존재직접영향상위해전적효과급최종간섭측량적정도。침대저일문제，본문제출료일충결합국부빈솔고계적소파역간섭합성공경뢰체（interferometric synthetic aperture radar，InSAR）상위려파방법。근거국부빈솔고계가이판단출간섭상위소파계수중포함유용신식적자대。결합 VisuShrink 화 NeighShrink량충소파역치수축방법분별구유거조효과호화세절보지능력강적특점，대유용신식소재자대적소파계수이용NeighShrink 방법진행역치수축，이대기타자대적소파계수칙이용 VisuShrink 방법진행역치수축，종이진가능지려제조성，동시보지간섭조문적세절신식불피파배。방진화실측수거실험험증료본문제출적려파방법적유효성。
Phase noise in the interferogram directly affects the result of phase unwrapping and the precision of interferometirc measurement.A novel approach combining the local frequency estimation with wavelet trans-form is presented to reduce interferometric phase noise for interferometric synthetic aperture radar (InSAR). According to the local frequency estimation result,the subband of wavelet coefficients containing useful infor-mation can be found out.Based on the fact that the VisuShrink method has effective noise reduction ability and the NeighShrink method performs well in detail preservation,the wavelet coefficients containing useful informa-tion are shrunk by the NeighShrink method while the others are shrunk by the VisuShrink method.As a result, the noisy interferogram can be efficiently filtered without destroying the fringes.The experiments using the sim-ulated data and the real data demonstrate the validity of the proposed method.