| 王 安， 张芳芳， 罗晓斌 |
（西北工业大学 自动化学院，陕西 西安710072） |
 摘要：对铁路轨道移频信号的频谱进行了分析，根据其频谱特点，提出了基于欠采样的FFT检测方法，并给出了计算原始频谱和上下边频的新方法，分析了采样频率的选取以及欠采样前后信号频谱之间的关系，同时对频率分辨率和精度进行了研究。此方法简单易行，具有很高的工程实用价值。 |
| 关键词：移频信号；欠采样；采样频率；频谱关系；频率分辨率 |
| 中图分类号：TN 911.72 文献标识码：A 文章编号：1000-8829(2008)05-0045-03 |
| A New Demodulation Method for FSK Signal |
| WANG An， ZHANG Fang-fang， LUO Xiao-bin |
| (School of Automation, Northwestern Polytechnical University, Xi’ an 710072, China) |
| Abstract：After analyzing the spectrum of the FSK signal,FFT detection technic based on undersampling was put forward,and a new method to calculate original spectrum,upper frequency and lower frequency was presented,the selection of sampling rate and the transformation of spectrum after sampled were analyzed,and the frequency resolution and detecting accuracy were studied.This method is of high maneuverability and has the actual application value. |
| Key words：FSK; undersampling; sampling rate; spectrum relationship; frequency resolution |
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