Train approach alarm based on steel rail guided wave technology

The invention provides a train approach alarm based on a steel rail guided wave technology. The train approach alarm comprises a guided wave transmitting unit, a signal acquisition unit, a signal processing unit, an alarm unit and a mobile phone app unit; the signal processing unit is connected with the signal acquisition unit; the guided wave transmitting unit is connected with the signal processing unit; the alarm unit is connected with the signal processing unit; and the mobile phone app unit is connected with the other units. On-site alarming can be carried out when no network signal exists, specific information about train approaching is provided, and the warning effect is remarkable; when a network signal exists, an alarm signal can be received through a mobile phone app, and part of algorithm parameters of equipment can be changed; and the size is small, carrying is convenient, and temporary construction operation in a railway section is met. 本发明提供了一种基于钢轨导波技术的列车接近报警器，包括导波发射单元、信号采集单元、信号处理单元、报警单元和手机app单元