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。
After analyzing the spectrum of the FSK signal, FTT 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.
出处
《测控技术》
CSCD
2008年第5期45-47,共3页
Measurement & Control Technology
关键词
移频信号
欠采样
采样频率
频谱关系
频率分辨率
FSK
undersampling
sampling rate
spectrum relationship
frequency resolution
