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基于轨道电路链型电路等效模型提出了一种新的轨道电路计算方法——有限元准对角线矩阵法，给出了其计算公式。采用该计算方法对城市轨道交通数字编码式音频轨道电路进行了仿真计算，分析了一些影响接收电压的因素
Based on the equivalent model of the track circuit chain circuit, a new method of calculating the track circuit, finite element quasi-diagonal matrix method, is presented. The calculation method is used to simulate the digitally encoded audio track circuit of urban rail transit. Some factors affecting the receive voltage are analyzed