After making skew rectification , we do the image registration . based on several hypotheses about image ' s overlapping area , we deduce that the minimal overlapping area in one image can act as the template , the maximum overlapping area in the other image can act as the searching area , the pwfm is used to establish the correspondence of the template ' s coordinates in two images , namely obtain the shift parameters tx and ty . we also provide a multiple images " registration method 在对图象进行偏斜纠正以后，本文对图象重叠区域归纳出几条基本假设，在此基础上推导出了最小重叠区域作为模板，最大可能重叠区域作为搜索区域，应用参数维纳匹配滤波进行模板匹配，确定图象之间的平移参数t _ x和t _ y ，完成了两幅图象的拼接。
Using the way combining the mathematic morphology top - hat and gauss matched filtering can effectively reduce the influence of the inherent fovea and the marginal noise brought forth by the retinal camera caliber in retinal image and increase the precision of retinal image segmentation and feature point extraction 文中提出了采用灰度数学形态学中的top - hat变换和高斯匹配滤波相结合的方法，用来有效的降低视网膜荧光图像中固有的小窝现象及眼底照相机的口径所引起的视网膜图像边界像素噪声，极大的提高了图像分割及特征提取的精度。
Analyze , design and simulate the digital down - convert frequency . first , the analogue if signal is converted to digital if signal in one a / d convertor which used passband sampling theory . the digital if signal is then passed to a pair of digital mixers operating in phase quadrature for mixing the if signal to baseband signal 首先利用带通采样定理对中频模拟信号进行a / d变换后将其混频到基带，然后用平方根升余弦滚降滤波器同时完成低通滤波和匹配滤波双重作用，以提高解调器的效率。
Contributions in this paper mainly sh ow four points : 1 the structure characteristic of the received ds - cdma signal is analyzed in the presence of multi - path slow fading effect case for wireless mobile communication . according to this characteristic , four data - selected schemes based on chip - matched filter are presented from the perspective of energy and structure of signal . and the impact of these schemes on multiple - access interference ( mai ) and inter - symbol interference ( isi ) is analyzed 本文的主要贡献在于四个方面： 1 、针对无线移动通信系统中广泛存在多径慢衰落效应的情况，分析了ds - cdma系统中接收信号本身的结构特征，根据这个特征，在匹配滤波的基础上，从能量与信号结构的角度提出了四种不同的数据采用方案，并分析了不同数据方案对多址干扰与码间干扰的影响。
This dissertation adopts a universal digital ds / dmpsk modulation and demodulation scheme which is based on fpga . this scheme adopts quadrature balanceable modulation , intermediate frequency sampling , digital matched filtering , delay differential demodulation techniques and so on . it directly processes the digital signals on intermediate frequency without down - conversion , and doesn ’ t need pseudo random codes synchronization and carrier wave extraction circuits 本文采用了一种基于fpga的通用数字调制解调方案,该方案在调制端采用了正交平衡调制技术,在解调端采用了中频带通采样、数字匹配滤波、延时差分解调等技术,直接在中频上进行数字信号处理,不需要进行下变频,也不需要增加额外的伪随机码同步捕获和载波提取电路。
A new fluid level measurement method , based on ultrasonic measurement , for calculating the velocity of sound and the fluid level is presented . this method points out that a low - power acoustic signal generator under control can be used to emit spread spectrum signals and the fluid level can be worked out by detecting the correlation - peak output of the matching filter whose input is the echo signal received by a microphone 本文提出了一种新的基于扩频通信原理的液位测量方法，使用可控声源，发射较低功率的频谱扩展信号，在接收端对回波信号进行匹配滤波处理，通过检测相关峰来确定特征回波的位置，从而计算出液位。
Based on ica post processing matched filter multi - user detection lets the output of traditional matched filter to initialize the ica iterations , not only the known spread information of interesting user is used to overcome the uncertainness of ica , but also the character of statistical independence is used . the simulation results show that it advances the ability of traditional detector when the signal - noise - ratio is large . keywords code division multiple access ; independent component analysis ; channel estimation ; matched filter ; blind multi - user detection 基于ica后处理的匹配滤波多用户检测是用传统的检测器的输出来初始化ica的迭代，它不但充分利用多用户信号的已知信息，克服了ica的不确定性问题，同时也充分利用了多用户信号的统计独立性，仿真实验结果证明这种多用户检测算法在高信噪的情况下，误码性能改善随着信噪比的提高不断增加。
In the same time , a better algorithm to suppress side lobe after match filtering is presented , which is based on the analysis of component and residual of imfs . it is found that the algorithm reduces the shortage of emd algorithm and the high resolution image of sar is obtained under noise condition 本文的主要工作如下: 1 、在sar成像应用中,通过分析匹配滤波前后回波的emd分解结果,得出emd分解在流程中的位置;通过对imf分量与余量的分析,给出了优于常用方法的抑制匹配滤波后回波旁瓣方法,并克服emd方法自身的某些缺点,从而在含噪声条件下使sar成像结果更加清晰。
