摘要
本文结合LabVIEW虚拟仪器开发平台和Matlab软件强大的数值分析功能的优点,将Matlab和LabVIEW混合编程技术应用于信号处理领域,设计了利用加权平滑相位差分对实信号进行瞬时频率估计的虚拟仪器。该方法既能提供良好的计算机用户图形界面,又能实现对信号瞬时频率的提取。仿真实验验证了典型的线性调频信号以及指数型调频信号在SNR为30dB和10dB条件下瞬时频率测量误差分别为0.01,0.05左右。结果表明此种方法在高信噪比条件下可以达到较高的测量精度。
This paper combines the LabVIEW virtual instrument development environment and the merit of Matlab software which is a high-performance software for technical computer. It uses the combined programming technology of LabVIEW and Matlab in signal processing and designed the virtual instrument that using weighted smoothing phase-difference method to estimate the instantaneous frequency of solid signal. The computer-user graphical interface was designed well in this way, and the signal instantaneous frequency was extracted. The simulation results show that the instantaneous frequency measurement errors of the typical LMF signal and exponential FM signal are about 0.01, 0.05, respectively, in the condition that SNR are 10dB and 30dB. The experiment shows that this method could be extracted effectively in high SNR.
出处
《电测与仪表》
北大核心
2009年第3期24-27,共4页
Electrical Measurement & Instrumentation
基金
国家"863"计划资助项目(2006AA09Z14)
