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基于DSTFT的PCM/FM信号软件化解调方法研究
引用本文:章兰英,袁嗣杰,侯孝民,刘东华. 基于DSTFT的PCM/FM信号软件化解调方法研究[J]. 装备指挥技术学院学报, 2008, 19(1): 94-98. DOI: 10.3783/j.issn.1673-0127.2008.01.023
作者姓名:章兰英  袁嗣杰  侯孝民  刘东华
作者单位:装备指挥技术学院,光电装备系,北京,101416
摘    要:根据PCM/FM信号的特点,提出一种基于离散短时傅里叶变换(discrete short time Fourier transform,DSTFT)的软件化解调方法:首先利用DST-FT计算PCM/FM信号的0、1频点的频谱能量,然后通过比较2个频点频谱能量的大小实现信号的判决;详细论述此种解调方法的基本原理和实现过程,提出采用小数形式的频点来提高解调精度;利用C++语言编程实现了该解调方法,并用从实装设备采集的PCM/FM信号对解调软件进行测试。测试结果表明:该方法对PCM/FM信号具有较好的解调性能,且实现原理简洁,运行效率较高,具有一定的工程应用价值。

关 键 词:PCM/FM信号  离散短时傅里叶变换  软件解调
文章编号:1673-0127(2008)01-0094-05
收稿时间:2007-04-28
修稿时间:2007-04-28

Research on Method of Software Demodulation for PCM/FM Signal Based on DSTFT
ZHANG Lanying,YUAN Sijie,HOU Xiaomin,LIU Donghua. Research on Method of Software Demodulation for PCM/FM Signal Based on DSTFT[J]. Journal of the Academy of Equipment Command & Technology, 2008, 19(1): 94-98. DOI: 10.3783/j.issn.1673-0127.2008.01.023
Authors:ZHANG Lanying  YUAN Sijie  HOU Xiaomin  LIU Donghua
Affiliation:ZHANG Lanying, YUAN Sijie, HOU Xiaomin, LIU Donghua(Department of Optical and Electronic Equipment, the Academy of Equipment Command & Technology, Beijing 101416, China)
Abstract:According to the characteristics of PCM/FM signal, a new method of software de-modulation based on discrete short time Fourier transform(DSTFT) is presented. Firstly, the spectrum energies of 0/1 frequency of PCM/FM signal are computed by DSTFT. Then, the signal is demodulated by comparing the spectrum energies of the two frequencies. The basic theory and the course of realization of the system are explicated in this paper. In order to improve the demodulation precision, the two frequencies are used fraction form. Finally, the demodulation method is programmed by C++, and the demodulation software is tested with the PCM/FM signal sampled from the real equipment. The test result indicates that the method has better performance and high efficiency for the factual PCM/FM signal. The method has a bright future for application in demodulating PCM/FM signal.
Keywords:PCM/FM signal   discrete short time Fourier transform   software demodulation
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