一种新型宽范围频率相位计的研究

发布时间：2018-05-08 21:14

本文选题：相位处理 + 频率测量　；参考：《西安电子科技大学》2015年硕士论文

【摘要】：通常的频率测量方法中针对不同频率的相位变化无法直接检测,尤其是对于那些相位信息连续长期变化的复杂频率信号。本文运用新原理和新技术实现了一种可以不经频率变换直接获得在任意频率下被测信号相位差信息的测量方法,在低成本的前提下研究和开发一种具有高分辨率和宽频率范围的测相途径及其仪器实现。文章从任意信号间最基本的相位问题深入分析探讨,借助于相位重合检测分辨率的边沿效应大幅度提高频率测量精度,并结合创新性的数字化重建技术,在高分辨率、无间隔、相位连续的频率测量基础上重建数值等于被测标称频率的虚拟信号,利用虚拟信号和实体信号之间的比对以及对虚拟信号调整等方法,实现了一系列对信号的相位和频率的精密测量控制,进而给出了宽范围频率相位计的系统整体工作原理及各功能模块具体实现。系统中采用FPGA实现测量核心部分即相位重合点检测和无间隔门时计数模块,由单片机读取FPGA采集的数据进行处理并完成显示工作。本文研究实现了宽频率范围内的高分辨率不间断的频率测量,而且可以通过数字化处理直接得到被测信号相位的连续变化的信息特性。实验验证了该方案的正确性和科学性,对任意频率测量的稳定性指标到达10-12量级,并且任意频率值相位处理分辨率达到ps量级,大幅度简化了测量设备结构,具有测量分辨率高、频率范围宽、附加噪声小而且可以直接测量相位差等优点。这种基于边沿效应结合数字化重建的处理方法不但突破了传统的相位处理只限于相同标称频率的思想,而且使得复杂的频率、相位的测量能够高精度的实现,在大量锁相环技术、量子频标技术等相关领域,将会是一项有非常重要意义的成果。
[Abstract]:In common frequency measurement methods, the phase change of different frequency can not be detected directly, especially for those complex frequency signals whose phase information is continuously changing for a long time. In this paper, a new method of measuring the phase difference of the measured signal without frequency transformation is realized by using the new principle and new technology, which can directly obtain the information of the phase difference of the measured signal at any frequency. A phase measurement method with high resolution and wide frequency range and its instrument realization are studied and developed under the premise of low cost. Based on the analysis of the most basic phase problem between arbitrary signals, the accuracy of frequency measurement is greatly improved by means of the edge effect of phase coincidence detection resolution, and the innovative digital reconstruction technique is used to improve the accuracy of frequency measurement. On the basis of continuous phase frequency measurement, the virtual signal whose value is equal to the measured nominal frequency is reconstructed. The comparison between the virtual signal and the solid signal, as well as the adjustment of the virtual signal, are used. A series of precise measurement and control of the phase and frequency of the signal are realized, and then the whole working principle of the wide range frequency meter and the realization of each function module are given. In the system, FPGA is used to realize the core part of the measurement, that is, phase coincidence point detection and non-spaced gate counting module. The data collected by FPGA are read by single chip computer for processing and display work is completed. In this paper, the continuous frequency measurement with high resolution in a wide frequency range is studied, and the information characteristics of the continuous variation of the phase of the measured signal can be directly obtained by digital processing. The experimental results show that the scheme is correct and scientific. The stability index of arbitrary frequency measurement reaches 10-12 orders of magnitude, and the resolution of phase processing of arbitrary frequency value reaches PS order, which greatly simplifies the structure of measuring equipment. It has the advantages of high resolution, wide frequency range, low additional noise and can measure phase difference directly. This method based on edge effect and digital reconstruction not only breaks through the traditional idea that phase processing is limited to the same nominal frequency, but also makes the measurement of complex frequency and phase can be realized with high accuracy. It will be a very important achievement in many fields such as phase-locked loop technology, quantum frequency standard technology and so on.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM935.1

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