【摘要】 根据频谱分析的要求,给出了ISA总线数据采集卡的硬件设计,利用该数据采集卡编制相应的软件进行数据采集,并编制数据分析软件进行频谱分析.为了提高频率分辨率,在该虚拟仪器中用ZFFT算法进行了局部谱的细化,给出了该算法的实现流程,讨论了实现该算法的难点,编制了实用程序,应用效果十分理想,极大地改善了分析的实时性.更多还原

【Abstract】 According to the demand of spectrum analyzer, the hardware design of ISA bus data acquisition card is discussed. The software for data acquisition using the data acquisition card is programmed. The data analysis software for low frequency spectrum is programmed. In order to improve frequency - resolving power, the part of frequency spectrum is zoomed using ZFFT algorithm in the virtual instrument. The flow of the ZFFT algorithm is put forward, the difficulty for implementing the ZFFT algorithm is discussed in detail. A program is made to test the method. Running results show that it is effective. It greatly improved the real -time performance for frequency spectrum analysis.更多还原