Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
機場捷運-號誌系統無線電傳輸系統簡介 Introduction to Radio Transmission of the TIAA MRT Signaling System
RTS號誌設備室設備及道旁無線電設備。

機場捷運的號誌是全國率先使用戶外天線當作無線電傳輸媒介的鐵路運輸系統,而世界各國捷運號誌早已有採用戶外天線傳輸的案例,如義大利Milano Line1、西班牙Malaga L1&L2等等。
號誌無線電傳輸系統(RTS)係提供機房與列車之間通訊的媒介(傳送控制號誌及資訊)。採用2.4GHz的乙太網路(Ethernet)展頻無線電系統,具有抗干擾的特性。
RTS由三個主要區塊組成:
1.號誌設備室設備:包含HDLC/IP轉換器及乙太交換器,並使用光纖連接道旁無線電設備,如圖1上半部所示。
2.道旁無線電設備:包含光纖/乙太信號轉換器及110V電源供應器,信號經由分歧器分別傳到指向相反方向的2支天線,如圖1下半部所示。天線大約間隔50~250公尺會有一座,設置原則為某一天線B之前後相鄰兩支天線A及C的覆蓋範圍必須涵蓋天線B,以達到故障備援目的,如圖2所示。
3.車載無線電:包含行動無線電及HDLC/IP轉換器。
號誌無線電天線外觀呈網狀或平板狀,網狀天線適用於高架段,平板狀天線則可適用於高架段及隧道段,其訊號傳送距離約300公尺~1,300公尺。

The signaling system of TIAA MRT is the first in the country to use outdoor antenna as a radio transmission medium of the railway transport system. In contrast to Taiwan, countries around the world have long used outdoor antenna transmission, such as Milano Line1 in Italy, Malaga L1 & L2 in Spain and so on.
The Radio Transmission System (RTS) is the medium that provides communication between the equipment room and the train (transmitting control signals and information). The system uses 2.4GHz Ethernet spread spectrum radio system with anti-interference characteristics.
The RTS is composed of three main blocks:
1.Equipment in the signaling facility room: includes HDLC / IP converters and Ethernet switches. The equipment use optical fiber to connect with wayside radio equipment, as shown in the upper half of Fig. 1.
2.Wayside radio equipment: includes fiber / Ethernet signal converter and 110V power supply. The signals are transmitted respectively to the two antennas in the opposite direction via the splitter, as shown in the lower half of Fig. 1. Each adjacent antenna will have a distance of about 50 to 250 meters. The installation principle for the antenna is that the coverage of two antennas, A and C, which is before and after antenna B, must cover antenna B in order to achieve the purpose of redundancy, as shown in Fig. 2.
3.On-train radio: includes mobile radio and HDLC / IP converters.
The radio antenna has the appearance of mesh or flat plate. The mesh antenna is suitable for the elevated section; the flat antenna can be applied to the elevated section and the tunnel section. The signal transmission distance is about 300 meters to 1,300 meters.

  • RTS道旁無線電天線的備援設計。
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