摘要
为保障机车运行安全,而对指挥行车的信号快速、准确的测试是重要手段之一,所以对铁路轨道移频信号FSK的频谱进行了分析;为避免移频信号在频域分析中产生混叠,从采样信号中恢复原信号,根据带通信号的窄带特性,采用欠采样技术进行采样和快速傅里叶变换对移频信号进行处理,以提高频率分辨率;针对移频信号的频谱特点,提出了利用DSP的移频信号高分辨率的检测方法,给出了检测系统的结构框图,同时分析了系统的实时性;该检测系统具有体积小、接口丰富、精度高等优点,为设计快速、准确的移频检测系统提供了依据。
Rapidly and exaetly testing the signal whieh direets the train to pass, it＇s one of the important ways to ensure railway transportation safety. In order to avoid FSK signal mix together in frequeney domain analysis, resume the original signal from the sampling signal, based on the narrowband eharaeteristie of the band-pass signal, Under-rate Sampling teehnology and Fast Fourier Transform Algorithm are introdueed in signal proeessing. Aeeording to the eharaeteristies and analysis of the speetrum of FSK signal, a high resolution testing method based on DSP is put forward. The framework of a testing system was presented, and its real-time ability is also diseussed. The testing system has many advantages, sueh as little volume, abundant interface, and high-aeeuraey, whieh supplied the basis for designing high --speed and high- aeeuraey FSK testing system.
出处
《计算机测量与控制》
CSCD
2007年第5期561-562,568,共3页
Computer Measurement &Control
基金
国家863计划资助项目(2003AA411210)
