Wavelet is suitable to non - stationary signals processing . we applied wavelet transform to insar data processing and did following researches : 1 ) assumed the probability density function of signal and noise of real part and imaginary part of sar interferogram 本文将小波分析应用于干涉sar数据处理，进行了以下几方面的研究： 1 )将干涉图复数据分为实部和虚部，对实部、虚部的信号和噪声的概率密度函数进行假定。
The filtered results to a real interferogram showed the proposed method is powerful to interferogram speckle noise reduction , as well as it can preserve fine details in the interferogram that are directly related to the ground topography and maintain phase values distribution 对一幅干涉相位图的滤波结果表明，该算法很好的抑制了斑点噪声，极大的降低了残余点的数量，保持了条纹边缘和相位细节信息，并使绝对相位保持在一定的动态范围。
Then , it is followed by a more detailed discussions on the main steps of the insar data processing flow and insar data simulation , including the complex image coregistration , flat effect of interferogram , noise filtering of interferometric image , phase unwrapping , the reconstruction of dem , and so on 然后，结合实例对图像配准、平地效应去除、干涉条纹滤波、相位展开以及数字高程图反演等数据处理流程主要环节以及干涉sar数据仿真进行了深入研究。
It is widely used to measure optical element , optical system , detection of optical surface and the physical quantities ( such as field of temperature , field of density ) related with optical path difference . the underlying measurement principle of psi is to determine the phase of the intensity signal in interferogram received at each pixel of an imaging device 移相干涉术( psi )作为快速、非接触的精密测量手段，已经广泛地应用于光学零件、光学系统、精密表面检测和其它一些与光程差参数相关的物理量的测量(如温度场、密度场等) 。
The fundament of flat terrain phase effect and its removal are stated . the interferogram consists , for each pixel , of the complex conjugate product of two sas images directly , which ca n ' t reflect the actual terrain change . the general phase trend in range can be considered as the phase generated by an ideally flat terrain and is often subtracted from the interferogram before further processing 论述了水平地形效应产生原理及其消除方法，由于水平地形效应的存在使得两幅sas复图像直接复共轭相乘得到的相位图不能直观地反映出实际地形的拓扑变化，所以在对干涉相位图进行滤波及相位展开处理前应当消除干涉相位图像的水平地形效应。
Point diffraction interferometer - a physical idea , is invented by smartt and strong in 1972 , advanced by smartt and steel , and used to test astronomical telescope , it has simple structure and has not special demand to source . recently . with the development of fiber ' s manufacture and coupling technology . the simple modern fiber ' s center is smaller than before , this make it possible to progress fiber point diffraction interferometer ( pdi ) , in addition to test convergent wavefront , it can test the reflective concave . the excellence of pdi is that it does not need standard mirror . in intereference testing , the standard mirror is the main reason which limit the improvement of precision , pdi can avoid difficulty to provide the wide future for high precision testing . pdi , which produce the standard sphere wavefront , is an instrument which realize the phase shifting with piezoelectric transducer ( pzt ) , and collect the interferogram with ccd , in this paper , a adjusting methord is described , then data processing is obtained 点衍射干涉仪这一物理思想，早在1972年smartt和strong就已发明，由smartt和steel做了进一步发展，并成功的用于检测天文望远镜，它结构简单，对光源没有特殊要求，近年来，由于光纤制造工艺以及耦合技术的发展，单模光纤纤芯不断缩小，为光纤点衍射干涉仪得以发展提供了前提条件，该干涉仪由激光照明，除了检测会聚波前外，还可以用来检测反射凹球面，进而应用到单个面形的检测；另外，光纤点衍射干涉仪最大的优点是不需要标准镜，在干涉检测中，标准镜是检测精度受限的很大原因，光纤点衍射干涉仪能绕开这一难度，为进行高精度的光学检测提供了广阔的前景。
7 . based on our crsi and algorithm and double lcslm , an adaptive optical hardware system which c & n be used to model arbitrary complicated wavefront and the compensation of the wavefront can be accomplished was built . and according to the characteristic of a crs interferogram of a step wavefront produced by an lctv , the pixel - level calibration of this system is implemented 七、采用已建立的空间相位调制环路径向剪切干涉仪及其波前重建算法，和位相调制持性已知的两块液晶空间光调制器，创建了一套用于模拟产生任意畸变波前并加以检测和反馈控制的自适应光学硬件系统，并通过台阶波前对该系统实现了像素级校准。
The thesis involves all - aspect of the signal processing of interferometric synthetic aperture sonar , especially in the challenging problems such as phase - preserved sas imaging algorithm , image registration , interferogram denoising filtering and two - dimensional phase unwrapping . in allusion to difficulties and emphases , some new methods are proposed . the study is important to prompt the development of interferometric synthetic aperture sonar in china 本论文对干涉合成孔径声纳信号处理过程进行了全面的论述，对其中的关键技术如保相的二维成像算法、复图像配准、干涉图降噪滤波和二维相位展开作了重点分析，并提出了一些新的方法，论文对推动我国干涉合成孔径声纳信号处理技术的研究具有重要的意义。
So the flow field visualization in intake duct was realized . according to the experimental requirements , tow different transparent intake duct model were designed . a real - time holographic interferometry measuring system was developed , in which he - ne laser was used as light source , and a ccd ( charge coupled device ) video camera was used to grab the interferogram . a intake simulation system was build - up 本文根据研究要求，用甲基丙烯酸甲酯制作了两种不同类型的进气道透明模型；设计并建立了利用he - ne激光器做光源的实时全息干涉测量光学系统；设计了一套能够模拟进气道在某一气门升程时的进气系统，用mtv - 1802cbccd摄像机对干涉条纹进行了实时采集。
3 ) for weak noise interferogram or filtered interferogram , dyadic wavelet can be used to detect fringe edges . a gvf snake model was used to link discrete edges , the linked edges were kept well accordance with fringes of phase map . 4 ) phase unwrapping algorithm based on edge detection is suitable to well separated fringes , the unwrapped phase can be rewrapped to the original phase map 4 ）对于低噪声情况下或滤波后的干涉条纹图，在基于边缘检测的相位解缠过程中，利用snake模型可以高效准确的实现边缘点的连接，所连接的边缘线与干涉条纹很好的吻合，可将连线的精度控制在三个像元。
