| 朱江淼,乔孟元,赵科佳,马培香,高秀娜.基于预失真算法的任意波形发生器校准的研究[J].电子测量与仪器学报,2020,34(5):122-126 |
| 基于预失真算法的任意波形发生器校准的研究 |
| Research on calibration of arbitrary waveform generator based on predistortion algorithm |
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| DOI： |
| 中文关键词: 预失真 多频正弦信号 校准 任意波形发生器 |
| 英文关键词:predistortion multi-frequency sinusoidal signal calibration relative error |
| 基金项目:三网融合中的视频计量标准与溯源技术研究(2014BAK02B03)、国家市场监督管理总局能力建设项目(ANL1817)资助 |
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| 中文摘要: |
| 任意波发生器由于其可编程生成任意信号的特性,是信号与系统研究中的常用理想信号源,对其进行可溯源的校准是
非常重要的。 构建了由任意波形发生器、电缆、转接头、数字示波器和计算机组成的校准系统,采用预失真算法实现了对任意波
形发生器的可溯源校准。 预失真校准方法是基于补偿的思想,首先加载一个仿真的理想信号到任意波形发生器,由示波器进行
可溯源测量,测量的信号包含了任意波形发生器和传输器件的失真,这个失真可以通过测量信号与理想信号的差值计算出来,
根据这个失真对加载到任意波发生器的理想信号进行调整,最终实现了任意波形发生器的可溯源校准,使输入到示波器的信号
成为一个理想信号。 这是一个迭代过程,设计了迭代结束条件,即直至接近数字示波器的测量精度为止。 为了验证校准方法的
有效性,将 50 个等幅恒相的正弦波叠加而成的合成信号加载至任意波形发生器,经 3 次迭代,其相对误差的最大值从
10. 408 9% 减小到 2. 305 3%。 这表明研究的校准方法是有效的,校准后的任意波形发生器信号源系统可作为一个标准信号
源,用于测量仪表的校准。 |
| 英文摘要: |
| Because of the characteristic of generating any signal programmatically, the arbitrary waveform generator is an ideal signal
source in the study of signal and system, so it is very important to traceable calibration. In this paper, a calibration system consisting of
arbitrary waveform generator, cable, adapter and digital oscilloscope is constructed. The traceable calibration of arbitrary waveform
generator is realized by using predistortion algorithm. The predistortion calibration method is based on the idea of compensation. Firstly,
a simulated ideal signal is loaded to arbitrary waveform generator, which can be traced by oscilloscope. The measured signal contains the
distortion of arbitrary waveform generator and transmission device. This distortion can be calculated by the difference between the
measured signal and the ideal signal. According to this distortion, the ideal signal loaded to arbitrary waveform generator is adjusted,
and finally it is realized that the traceable calibration of arbitrary waveform generator, and makes the signal input to oscilloscope become
an ideal signal. In practice, this is an iterative process. In this paper, the condition of the end of the iteration is designed, that is, until
it is close to the measurement accuracy of the digital oscilloscope. In order to verify the validity of the calibration method, this paper
loads 50 sine waves of equal amplitude and constant phase into arbitrary waveform generator. After three iterations, the maximum relative
error is reduced from 10. 408 9% to 2. 305 3%. This shows that the calibration method studied in this paper is effective. After
calibration, the signal source system of arbitrary waveform generator can be used as a standard signal source for the calibration of
measuring instruments. |
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