基于混合滤波器组的双通道并行数据采集研究

发布时间：2018-01-10 11:31

  本文关键词：基于混合滤波器组的双通道并行数据采集研究　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 数据采集 混合滤波器组 功率互补 遗传算法 模拟偏差

【摘要】：数据采集是数字信号与信息处理系统的重要组成模块。随着数字化技术的快速发展,高速率高分辨率的模数转换器(Analog to Digital Converter,ADC)在信息技术中的各个领域得到了广泛的应用,系统对ADC的性能指标要求也越来越高。如何实现高速率高分辨率的数据采集系统已经成为了国内外的研究热点。其中基于混合滤波器组的多片ADC并行数据采集是一种有效的解决方案,具有广泛的应用前景。本文针对基于混合滤波器组结构的并行数据采集系统进行了分析,从工作原理和理论推导方面进行基于功率互补结构分解滤波器组优化设计,然后提出了一种优化设计的实施方案,通过系统仿真分析,验证了系统的合理性和可实现性。本文的主要研究内容包括:1、针对基于混合滤波器组的数据采集系统进行理论分析与推导,包括系统的工作原理以及实现中所涉及到的相关理论知识。2、依据功率互补的准则,通过相关约束条件,推导出五阶模拟分解滤波器组系统传递函数系数的约束公式,优化目标函数。利用遗传算法求得系数最优解,最终实现模拟分解滤波器组的优化设计。3、阐述数字综合滤波器组的优化设计理论,根据系统完全重构原则,求解出数字滤波器组的频率响应,根据傅里叶逆变换计算出数字综合滤波器的系数,并且在FPGA中应用多相结构优化改进数字综合滤波器组的实现方式。4、仿真分析系统物理实现中的模拟偏差,通过对分解滤波器的系统传递函数建立误差模型,经过理论推导并且引入信号测试,测量出具体的模拟偏差系数。再次依据系统完全重构原则优化求解出数字综合滤波器组的系数。5、最终优化设计出基于混合滤波器组的两通道并行数据采集系统,通过对系统的指标和引入信号的仿真测试结果分析,系统有效位数可以达到12 bits,可满足高速高精度的数据采集要求。
[Abstract]:Data acquisition is an important module of digital signal and information processing system. With the rapid development of digital technology. Analog to Digital converter (Analog to Digital converter) with high speed and high resolution has been widely used in various fields of information technology. The performance requirements of ADC are becoming higher and higher. How to realize the data acquisition system with high speed and high resolution has become a hot topic at home and abroad. Among them, the parallel number of multi-chip ADC based on hybrid filter banks is becoming more and more important. Data acquisition is an effective solution. This paper analyzes the parallel data acquisition system based on hybrid filter bank structure. The optimal design of the filter bank based on the power complementary structure decomposition filter bank is carried out in terms of working principle and theoretical derivation, and then an implementation scheme of the optimal design is proposed, which is analyzed by system simulation. The rationality and realizability of the system are verified. The main research contents of this paper include: 1. The theoretical analysis and derivation of the data acquisition system based on hybrid filter banks are carried out. Including the working principle of the system and the related theoretical knowledge. 2, according to the principle of power complementary, through the relevant constraints. The constraint formula of transfer function coefficient of the fifth order analogue decomposition filter bank system is derived to optimize the objective function. The optimal solution of the coefficient is obtained by using genetic algorithm, and the optimal design of the filter bank of analog decomposition filter bank is realized finally. 3. The optimal design theory of digital synthetic filter banks is expounded. According to the principle of complete system reconstruction, the frequency response of digital filter banks is solved, and the coefficients of digital integrated filters are calculated according to the inverse Fourier transform. And in FPGA, the realization mode of digital synthesis filter bank is improved by using polyphase structure optimization. 4, and the analog deviation in the physical realization of the system is analyzed by simulation. The error model of the system transfer function of the decomposition filter is established, and the signal test is introduced through theoretical derivation. The specific coefficient of analog deviation is measured, and the coefficient of digital synthetic filter bank is optimized according to the principle of complete reconstruction of the system. Finally, a two-channel parallel data acquisition system based on hybrid filter banks is designed. The effective bit number of the system can reach 12 bits by analyzing the index of the system and the simulation test results of the introduced signal. It can meet the requirement of high speed and high precision data acquisition.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP274.2;TN713
，

本文编号：1405135