基于MSP432的波形分析及显示系统设计  

Design of waveform analysis and display system based on MSP432

作　　者：王国庆 甄喆 袁毅 杨会龙 孙艳丽 WANG Guoqing;ZHEN Zhe;YUAN Yi;YANG Huilong;SUN Yanli(Naval Aviation University,Yantai 264001,China)

机构地区：[1]海军航空大学,山东烟台264001

出　　处：《电子设计工程》2023年第22期83-86,91,共5页Electronic Design Engineering

摘　　要：该文设计一种基于MSP432的波形分析及显示系统,待分析波形经放大后满足ADC输入电压需求。该系统通过快速傅里叶变换(FFT)进行频域信号的分析处理,并减少频谱泄露导致的误差,寻找最大幅值获得基波及各次谐波的位置点,得到各次谐波幅值、谐波失真度及测量的频率。将计算的各谐波幅值加权到相应的谐波波形上,完成重构波形并显示在迪文液晶屏上。通过Matlab仿真进行设计指导并对结果进行理论验证,结果表明在输入信号基频在10 Hz~100 kHz范围下失真率误差较低,实测可靠性高。A waveform analysis and display system based on MSP432 is designed.The waveform to be analyzed is amplified by the pull-up circuit to meet the ADC input voltage demand.The Fast Fourier Transform(FFT)is used to analyze and process the frequency domain signal.The error caused by spectrum leakage is reduced.The position of each harmonic wave is obtained by searching for the maximum value,and then the amplitude and distortion of each harmonic wave and frequency are obtained.The calculated harmonic amplitudes are weighted to the corresponding harmonic waveforms and the reconstructed waveforms are displayed on the DWIN screen.The design is guided by Matlab simulation,and the results are verified theoretically.The results show that the distortion rate error is low and the measured reliability is high in the range of 10 Hz~100 kHz of the basic frequency of the input signal.

关 键 词：MSP432 快速傅里叶变换 频谱泄露 失真度 

分 类 号：TN98[电子电信—信息与通信工程]