A Precise Digital Demodulation Method of the AM Signal

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A Precise Digital Demodulation Method of the AM Signal

更新时间：2026-09-14

- A Precise Digital Demodulation Method of the AM Signal
- 调幅信号的一种数字化精确解调方法
- Issue 1, Pages: 24-30(2003)
- 作者机构：
  
  长城计量测试技术研究所,北京,100095
- 作者简介：
- 基金信息：
- DOI：
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- Published：2003
- 稿件说明：
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梁志国. A Precise Digital Demodulation Method of the AM Signal[J]. 2003, (1): 24-30.
DOI：

梁志国. A Precise Digital Demodulation Method of the AM Signal[J]. 2003, (1): 24-30. DOI：

摘要

　目的　介绍一种在三参数正弦波拟合算法原理的基础上发展的绝对收敛的四参数最小二乘正弦波拟合算法

给出了其收敛区间、绝对收敛判据以及实现过程.在此基础上讨论实现正弦载波的调幅信号的数字化精确解调问题.方法　使用一个周期正弦波曲线模型的滑动拟合法

实现了幅度调制信号波形的精确解调.结果　在调制信号也是正弦波的情况下

仿真评价了幅度解调效果

并给出了解调失真的计算方法和结果.同时

在一个实测调幅曲线波形上进行解调分析

获得了非常明确的波形测量结果.结论　本方法是评价载波为正弦波的调幅信号的一种优良方法

准确度高、分辨力高

可用于调幅信号源及其解调设备的指标评价和检定测试.

Abstract

Aim\ A fourparameter sine wave curvefitting methd is introduced. As an absolute convergent course

it is developed on the base of threeparameter sine wave curvefitting method. The absolute convergent interval

the absolute convergence criterion and the realization course are presented. The demodulation of AM(Amplitude Modulation) signal of the function generator are discussed and achieved. Methods\ By using one period moving sine wave model

the precise demodulation of AM signal wave is achieved. Results\ In case that the modulating signal is a sine wave

the simulated result of demodulation amplitude is presented. The distortion of demodulation is given which describes each of the other parmeter jitters in each case. At the same time

one group of experimental results are given

which shows that the demodulation results are clear and definite. Conclusions\ The method is excellent in demodulating AM signal of the function generators. High accuracy

high resolution

can be obtained. The method can be applied to measure and calibrate both AM signal generator and its demodulation devices.

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references

　IEEEStd1057-1994.IEEEstandardfordigitiztingwaveformrecorders[S].

　梁志国,孙王景宇.超低频正弦波信号波形参数的精确评价[J].仪器仪表学报,2001,22(增刊):33-36.

　梁志国,朱济杰.量化误差对周期信号总失真度评价的影响及修正[J].仪器仪表学报,2000,21(6):640-643.

　DeystJP,SouldersTM,OtisM.SolomonJr.boundsonleast-squaresfour-parametersine-fiterrorsduetohar-monicdistortionandnoise[J].IEEETransactionsonInstrumentation&Measurement,1995,44(3):637-642.

　JengYC.High-precisionsinusoidalfrequencyestimatorbasedonweightedleastsquaremethod[J].IEEETransac-tionsonInstrumentation&Measurement,1987,36(1):124-127.

　JengYC,CrosbyPB.Sinewaveparameterestimationalgorithmwithapplicationtowaveformdigitizereffectivebitsmeasurement[J].IEEETransactionsonInstrumentation&Measurement,1988,37(4):529-532.

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