基于欠采样的单音周期信号幅频测量方法实现
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TP274.2

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Realization of the measurement of a singletone periodic signal’s amplitude and frequency based on undersampling
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    摘要:

    信号的幅度和频率可利用采样与分析的方法获得。然而根据奈奎斯特采样定理,过采样的方法受采样率的限制,难以采集高频信号。为利用较低的采样率获得信号的幅度和频率,设计了一种基于欠采样的单音周期信号幅频测量方法。以自研数据采集卡为欠采样硬件平台,采用快速傅里叶变换和曲线拟合等技术,利用100 MSa/s的采样率,实现信号100~150 MHz带宽内单音周期信号的幅频测量。测试结果表明,该方法具有较高的精度。另外,本方法无需恢复原始信号,硬件实现简单,软件计算量小,尤其适合测量窄带内单音周期信号的幅度和频率。

    Abstract:

    A signal’s amplitude and frequency can be measured by sampling and analysis. However, according to Nyquist sampling theorem, it is difficult to capture highfrequency signals with the method of Oversampling limited by the sampling rate. To obtain a signal’s amplitude and frequency by a low sampling rate, design a method within which the amplitude and frequency of a signaltone periodic signal can be measured by Undersampling. Take a selfdeveloped data acquisition card as the hardware platform, take advantage of a sampling rate of 100 MSa/s to measure the amplitude and frequency of a signaltone periodic signal which is located in a bandwidth of 100 MHz to 150 MHz by FFT operation and curvefitting. The test result makes clear that this method has high accuracy. In addition, with this method, there is no need to recover the original signal, and the hardware is easy to implement, the software bears small amount of calculation as well. This method is particularly suitable for measuring the amplitude and frequency of a signaltone periodic signal which is located in a narrowband.

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付宁 施睿 宋凌云 王志伟.基于欠采样的单音周期信号幅频测量方法实现[J].国外电子测量技术,2015,34(10):73-78

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  • 在线发布日期: 2015-11-09
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