基于DFT的数字相位计设计

Design of digital phase meter based on DFT

首先提出了相位差测量的应用场合、测量意义及常见测量方法。继而重点就数字测量方法进行讨论,分析了模拟信号的相位差在离散傅里叶变换之后的表达形式,给出了信号频谱不发生泄露的条件。接着针对测量原理,提出了硬件设计方案,分析了硬件电路的设计依据及系统工作原理,同时给出了软件的设计方案并阐述其工作流程。最后对算法进行了仿真,验证了DFT法测量相位差的可行性及其相比于模拟法的优势。

Firstly, propose the application, significance and common method of phase difference measurement. Then focus on the discussion of the digital measurement methods, analyzed the expression of the phase difference of the analog signal after the discrete Fourier transform, and the conditions that the signal spectrum leakage does not occur. According to the measurement theory,propose the hardware design of the measurement system, introduce how the circuits function, also gives the software design and elaborate its workflow. Finally, simulate the measurement algorithm to verify the feasibility and advantages of DFT method to measure the phase difference compared to the simulation method.