基于绝对位置编码的列车定位技术

介绍在轨道交通中常用的列车定位技术，分析各种技术的优缺点，提出一种基于绝对位置编码的列车定位技术。利用优序列（最大周期线性反馈移位寄存器序列）对轨道线路上的绝对位置进行编码，当列车在线路上运行时，通过车载阅读器顺序检测设置在轨道线路上的二值标记，在不同位置上读到的标记在移位存储器中构成唯一的位置编码，以此位置编码值作为地址与车载阅读器所处位置的坐标信息相对应，就可以实现列车的绝对定位。二值标记可以根据列车定位精度的需要等间隔或不等间隔布置，既可以对整条轨道线路统一编码，也可以与既有应答器相结合应用，每段应答器之间的轨道线路采用相同的编码。该定位方法具有高精度、高可靠性、低成本、抗干扰能力强的优点。

Train Positioning Technology Based on Absolute Position Encoding

The train positioning technology commonly used in railbound traffic is introduced. The advantages and disadvantages of different types of train positioning technology are analyzed in detail. The train positioning technology based on absolute position encoding is proposed. The absolute positions of the rail track are encoded with the m sequence. The biconditional markers placed on the rail track are detected sequentially by the train- borne reader. The exclusive position code consists of the binary information in the shift register. The absolute train positioning information can be extracted by decoding this position code. The biconditional markers can be placed at equal or unequal intervals according to train positioning precision, and they may encode the positions of the complete rail track or only a section between two balise devices. The presented method can improve the train positioning precision and reliability, intensify the ability against interference, and reduce the cost.