【作者】 王伶；

【导师】 刘明亮；

【作者基本信息】 北京工业大学 ， 计算机应用， 2003， 硕士

【摘要】 本文主要研究了数字系统频带展宽原理及频带展宽中的三个关键技术。第一是含噪声的数字反卷积。首先，介绍了数字反卷积的常用方法及噪声对数字反卷积的影响；然后，研究了常用的数字反卷积滤波器及滤波参数的优化准则；最后，给出了数字反卷积在频带展宽技术中的应用。第二是时基失真及漂移的补偿。首先，介绍时基失真的相关概念及其对测量信号的影响；其次，对时基失真特性测量的不同方法进行了理论分析和比较，并对分析信号法进行了仿真研究；再次，对时基失真的补偿方法进行分析和仿真研究；并专门对温度变化引起的时基漂移及其补偿方法进行了简要分析；最后，对时基失真条件下的频带展宽技术的仿真表明时基失真的补偿可以减小信号的误差，因而提高频带展宽的精度。 第三是时基抖动的补偿。首先，介绍了时基抖动的概念及其影响并给出时基抖动参数的测量方法；其次，对时基抖动的不同补偿方法进行理论分析和仿真研究，在此基础上提出新的时基抖动补偿方法——扩展的概率密度法。对时基抖动的频带展宽技术的仿真结果表明，通过扩展的概率密度法对时基抖动的补偿，可以减小信号的误差，因而提高频带展宽的精度。最后，我们对数字系统频带展宽技术中三项关键技术的综合仿真，并针对一个具体数字系统实施频带展宽进行了实验。研究结果说明数字反卷积展宽数字系统频带技术是可行的。更多还原

【Abstract】 In this paper, the extension theory of bandwidth in digital system and three key points of frequency band extension technology are studied experimentally by simulation.The first point we analyzed is the digital deconvolution with noise. We discussed common methods of digital deconvolution and analyzed effects of noise on it. Then, we simulated digital deconvolution filters and optimization criteria of filtration parameters. After that, we gave the application of them in the frequency band extension technique.The second point is the compensation of time base distortion and drift. First, we analyzed time base distortion and its effects on signal measurement. Then we compared different methods of measuring the time base distortion and simulated the analytic signal method. After that, we discussed the compensation methods of time base distortion. The time base drift deduced by the change of temperature is discussed particularly and the compensation method of it is analyzed. Finally, we also studied frequency band extension under time base distortion condition by simulation. The results show that the compensation of time base distortion can reduce the error of signal and then increase the accuracy of frequency band extension.The third is the compensation of time base jitter. We summarized the effects of time base jitter and the methods to measure the time base jitter. Different methods for time base jitter compensating are analyzed and simulated. On the base of that a new method called improved probability density function method is developed to compensate time base jitter. The frequency band extension with time base jitter is also studied by simulation. The results show that the compensation of time jitter can reduce the error of signal and then increase the accuracy of frequency band extension.We summarized three key points of frequency band extension technology and systematic studied these points by simulation. An experiment executing frequency band extension for a concrete digital measurement system was performed. The results show that the frequency band extension technology using digital deconvolution has feasibility.更多还原