基于 LabWi ndows／CVI 相位噪声测试系统的设计与实现*

摘要

为了提高相位噪声测量的效率，结合实际工程，基于虚拟仪器原理对相位噪声测试软件进行设计。软件采用模块化、层次化结构思想设计，基于LabWindow s／CVI平台以及VC＋＋6．0工具开发，采用了与GPIB接口通信、RS232串口通信、调用外部可执行文件等技术，方便地实现了被测信号大小的调整和相位噪声参数的测量。该检测系统软件运行稳定可靠，操作简单明了，自动化程度大大提高，具有一定的实用性和推广价值。%In order to improve the efficiency of the phase noise measurement ,combined with the actual engineering ,a phase noise measurement system software based on virtual instrument(VI) is designed .The software adopts modularity and hierarchical structure to design ,uses echnologies such as GPIB interface communication ,RS232 interface communication and calling external executable file multithread technology etc .It is developed by using LabWindows/CVI and VC+ +6 .0 based on Windows OS .It is able to adjust signal and measure phase noise conveniently with this software .The application shows that this system runs stably ,constructs simply and the degree of automation improves significantly .The technology and methods adopted in the system are practical and worthy of using abroad .