A Novel Measurement Method for Incidental PM at AM

ZHOU Feng; ZHANG Rui; GAO You-gang; RUAN Fang-ming; SHEN Yuan-mao; SHI Dan

doi:10.3969/j.issn.0372-2112.2012.03.030

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A Novel Measurement Method for Incidental PM at AM

更新时间：2025-07-16

- A Novel Measurement Method for Incidental PM at AM
- Acta Electronica Sinica Vol. 40, Issue 3, Pages: 592-594(2012)
- 作者机构：
  
  1. 北京邮电大学,北京,100876
  2. 工业和信息化部通信计量中心,北京,100191
  3. 贵州师范大学,贵州,贵阳,550001
  4. 北京邮电大学北京,100876
  5. 工业和信息化部通信计量中心北京,100191
  6. 贵州师范大学贵州贵阳,550001
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0372-2112.2012.03.030
  CLC： TN74
- Published：2012
- 稿件说明：
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ZHOU Feng, ZHANG Rui, GAO You-gang, et al. A Novel Measurement Method for Incidental PM at AM[J]. Acta Electronica Sinica, 2012, 40(3): 592-594.
DOI：

ZHOU Feng, ZHANG Rui, GAO You-gang, et al. A Novel Measurement Method for Incidental PM at AM[J]. Acta Electronica Sinica, 2012, 40(3): 592-594. DOI： 10.3969/j.issn.0372-2112.2012.03.030.

摘要

在测量调幅的伴随调相特性时

从时域和频域来看

AM和PM的"相伴共生"

导致测量困难

传统的频谱分析方法计算和操作复杂度都较高、且只适用于伴随调相较小的情况.为此可以使用新的方法:在特定频率关系下

利用数字矢量解调抽样

在IQ平面将AM和PM转换到幅度误差和相位误差两个独立参量

在设定规则的测量条件下

矢量相位误差和伴随调相之间存在明确数学关系.实验验证中设置不同条件参数组合

共计120种情况

测量结果证实该方法是准确的.

Abstract

When to measure the incidental PM at AM

because in time domain and frequency domain

AM and PM are accompanied but not independent

so it's difficult to measure incidental PM.Traditional method by spectrum analysis is complex

and is only applicable to situation with small PM index.A new method is proposed:Under a particular frequency Relationship

by digital vector demodulation and sampling

to transform the AM and PM to magnitude error and phase error in IQ domain independently

on the measurement rules

there is analytical relationship between digital demodulation phase error and the analog incidental PM.For a total of 120 cases of parameters combination

experiment is carried out;the measurement results confirmed that the method is accurate.

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