多相滤波器的设计及仿真

摘要

软件雷达是现代雷达的重要发展方向。其中数字化中频接收系统是关键技术之一。本论文以某雷达数字化接收系统为背景，主要研究其中的关键技术——多相滤波器的原理及设计与仿真。为了更好的理解，本文同时对数字滤波器作了简单的介绍，包括滤波器的定义、分类与实现方式。对无线电中的两个最基础的概念内插与抽取也做了介绍。对多相滤波器的原理进行了详细的说明，从公式推导上进行了理论实现的方法与可能。讨论了多相滤波如何实现信道化。最后介绍了数字滤波器的设计步骤并实现了多相滤波器的MATLAB仿真。

关键词：多相滤波器、软件无线电、数字滤波器。

Abstract

Software radar is an important developing direction of modern radar. Which digital intermediate frequency receiving system is the key technical one. This paper taking a radar system for background, digital receiving main research key technology - multiphase the principle of filter and design and simulation. In order to better understanding of digital filter, the paper also makes brief introduction, including the definition, classification and filter implementation. The two most basic to radio the concept interpolation and extract presented also. The principle of multiphase filter for a detailed instructions from the formula, the method to realize the theory with possible. Discusses how to realize the multiphase filtering channelized. At last, the paper introduces the design procedures of the digital filter and realize the multiphase filter MATLAB simulation.

Keywords: multiphase filter, software radio, digital filters

摘要I

第一章问题的提出IV

第二章数字滤波器概论IV

引言............................................................................................ IV

2.1、数字滤波器的定义 ............................................................ V

2.2、数字滤波器的实现方式 .................................................... V

2.3、数字滤波器的分类 ............................................................ V

2.4实际滤波器的设计指标 ..................................................... VI 第三章多相滤波器的理论原理VII

引言........................................................................................... VII

3.1整数倍抽取 ........................................................................ VII

3.2整数倍内插 ........................................................................ VII

3.3抽取内插器的实时处理结构——多相滤波结构 ........... V III

3.4频域抽取 ............................................................................. IX

3.5用加权函数展宽输出滤波器 ............................................. XI

3.6改变输出采样速率 ............................................................ XII

3.7多相滤波器实现信道化 ................................................... X III 第四章多相滤波器的MATLAB仿真XIV

引言......................................................................................... XIV

4.1数字滤波器设计的理论基础 .......................................... XIV

4.2FIR窗函数设计法 .............................................................. X V

4.3多相滤波器的MATLAB仿真........................................ XVI 第五章总结XIX

参考文献XX

致谢 XXI