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signal
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  信号
    Spectrum Analysis of Non-uniformly Sampling Signal of Track Irregularities
    轨道不平顺非均匀采样信号谱分析
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    PRESENT STATE AND DEVELOPMENT ON COLOURS OF OUR RAILWAY SIGNAL MARKER
    我国铁路信号和标志颜色的现状及其发展
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    Microcomputerized Shift Frequency Cab Signal System
    微机控制移频机车信号的研究
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    Signal Logic Computer—aided Analysis and Design on Railway Systems
    铁路信号逻辑的计算机辅助分析与设计
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    Development of and Prospect for Railway Section Signal
    铁路区间信号的发展和展望
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    Selection of Signal Equipment for Single Track Railway and the Analysis of Its Economic Efficiency
    单线铁路信号设备选用及经济效益分析
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    Problems on the Design of 4-aspect Signal System in China-As Viewed from the French TGV Signal System
    从法国TGV信号系统看我国四显示信号系统设计中的几个问题
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    The Contribution of Railway Communication and Signal to the Total Production of Railway Transportation
    铁路电务部门对铁路运输总产值的贡献
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    Current status and development of railway station and section signal facilities
    铁路车站和区间信号设备的现状与发展
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    Application of Failure-safety Theory in Railway Signal Systemv
    故障安全理论在铁路信号系统中的应用
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  signal
In the early 1960s research into radar signal synthesis produced important formulas describing the action of the two-dimensional Fourier transform on auto- and crossambiguity surfaces.
      
It is shown that the one-dimensional sampling sets correspond to Bessel sequences of complex exponentials that are not Riesz bases for $L^2[-R,R].$ A signal processing application in which such sampling sets arise naturally is described in detail.
      
Given a bandlimited signal, we consider the sampling of the signal and some of its derivatives in a periodic manner.
      
We present a method for finding the dual frame and, thereby, a method for reconstructing the signal from its samples.
      
We show that if no sampling of the signal itself is involved, the sampling is not stable and cannot be stabilized by oversampling.
      
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This article describes the automatic block system(ABS)——Polar-Frenquency Pulse ABS, which use the combination of two different polarities and two different frequencies of pulses to transmit the informations through the track circuit and to operate the wayside signals and cab signals in order to improve the railway carrying capacity for ensuring the train operations in safety.

本文介绍一种自动闭塞制式:极性频率脉冲自动闭塞。它以两种不同的极性和两种不同频率的脉冲组合作为轨道电路的传输信息,用以控制地面信号和机车信号,达到提高铁路线路通过能力,保证行车安全的目的。这种制式在国內部分地区已推广使用,它具有下列特点:1.在标准轨道电路条件下,满足调整、分流、断轨、机车信号四种状态,轨道电路长度不小于2.6公里。2.自动闭塞为三显示,机车信号为六显示。3.设备采用双重系统及故障报警检测装置,因此它具有较高的可靠性。4.设备工作稳定,满足铁路信号故障——安全原则。5.电路具有原理简明,工厂生产容易,现场维修方便等特点。

The frequency shift type automatic block and cab signal is an automatic block signal system with frequency modulation, the development work of which was started in 1965 and at present this system has been introduced to practical application.

移频自动闭塞及机车信号是一种频率调制式自动闭塞制式,从1965年开始研制,目前已推广使用。移频自动闭塞制式能够满足多种牵引动力要求,对交流、直流电力牵引区段牵引电流所产生的谐波干扰和内燃机车的电磁干扰等,都具有较高的抗干扰性能。本文介绍了移频自动闭塞制式的主要特点和电路方框图,并着重地叙述了交流电力牵引区段牵引电流工频基波、谐波干扰分析和有关数据。同时,对移频自动闭塞频率参数的选择及其抗干扰性能做了一般论述。文中还对非电化区段工频50赫的迷流干扰及内燃机车的电磁干扰等提供了测试数据。

The foundation of automatic block and cab signal is track ciruit. According to the authors point of view, track circuit should fulfil four and automatic block should fulfil eight fundamental requirements. And from the development of automatic block both at home and abroad, the frequency type automatic block and cab signal seem to be the best.Thence the author gives, with variable signal frequency, the comparative standards and formulas of calculation and also the calculated results and curves....

The foundation of automatic block and cab signal is track ciruit. According to the authors point of view, track circuit should fulfil four and automatic block should fulfil eight fundamental requirements. And from the development of automatic block both at home and abroad, the frequency type automatic block and cab signal seem to be the best.Thence the author gives, with variable signal frequency, the comparative standards and formulas of calculation and also the calculated results and curves. These make clear that the frequency ranges of automatic block and cab signal are most suitable when they are in the subsonic frequency range.With reference to our circumstances, codification is adopted. This makes up the subsonic frequency type coded automatic block and cab signal.

自动闭塞和机车信号的基础是轨道电路。本文列出作者关于轨道电路应满足4项以及自动闭塞和机车信号应满足8项基本要求的观点,并根据国内外自动闭塞的发展历史和近年来的发展趋势,指出频率式自动闭塞和机车信号是最适宜的,是大势所趋。 从满足轨道电路的四条基本要求出发,作者提出使用不同信号周率时的比较标准和计算公式,列出计算结果和曲线,说明频率式自动闭塞和机车信号采用亚音频的周率范围最为合宜。 结合我国具体情况,还采用了电码化,从而构成了亚音频频率式电码自动闭塞和机车信号制式。

 
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