铁路车载400MHz数字同频对讲中继设备及测试

Railway Onboard 400 MHz Digital Same Frequency Intercom Repeater Equipment and Its Testing

铁路专用对讲设备已经由450 MHz模拟制式演进为400 MHz数字制式。400 MHz数字对讲机在长编组动车组或重联动车组场景下使用直通模式工作时,由于车辆长度过长且运行速度快,对讲通话质量不佳,需在列车上装备400 MHz数字对讲中继设备来延长通信距离。通过比较各种400 MHz数字无线对讲技术的中继模式,研究并确定了基于同频中继转发模式的车内400 MHz数字对讲中继设备的工作原理、模式选择、组网方式和实现功能,并进行了现场测试验证。试验结果表明,车载400 MHz数字同频对讲中继设备能够实现车内语音和数据通信的中继转发,提升列车长、司机、机械师、乘警之间的通话质量,延长通话距离,能够满足实际通信应用需求。

Railway special intercom equipment has evolved from 450 MHz analog system to 400 MHz digital system. When 400 MHz digital intercom works in through mode under the scenario of long formation EMU, or Electrical Multiple Unit, or coupled EMUs, the communication quality of the intercom is poor due to long distance and fast running speed of the EMUs. Therefore, it is necessary to install 400 MHz digital intercom repeater equipment on the train to extend the communication distance and meet the needs of actual communication application.By comparing the relay modes of various 400 MHz digital radio intercom technologies, the working principle, mode selection, networking mode and realization function of the in-car 400 MHz digital radio intercom repeater based on the same frequency relay mode are studied and determined, and the field test and verification has been carried out. The test results show that the on-board 400 MHz digital same frequency intercom repeater can realize the relaying and forwarding of voice and data communication in the car, improve the call quality between conductor, driver, mechanic, and train policeman, and extend the call distance, which can meet the needs of practical communication applications.