摘要
铁路通信系统中主要采用的信号制式为国产移频信号和UM71信号,其表现形式均为二进制频移键控信号。采用自适应技术,分别以信号中的两个载频作为自适应滤波器的期望信号,提取其中某一频率分量,进而得到调制信号的包络求解调制频率,并结合后续频域算法得到两个载频的精确值。以铁路实测数据作为分析对象验证算法,实现了对信号的高精度检测。
Domestic YP and UM71 are the main mode signal for railway communication system, which are both frequency-shift keying signal. Adaptive technology is adopted in this paper. One carrier frequency of FSK signal is set to be the reference frequency of the filter, gaining an output. With further processing, contour of modulating frequency could be gained. Using two adaptive filters with the carrier frequencies separately, it can make an accuracy judgment and get a precise result. Moreover we can locate a section of signal of single frequency to get the precise carder frequency with spectrum analysis. This method is tested by detecting practical railway signal, reaching high accuracy.
出处
《中国仪器仪表》
2008年第1期45-49,共5页
China Instrumentation
