Abstract：Research purposes: In this paper，the introduction is given to the relay transmission system comprised of the base station，repeater，trunk line amplifier，leaky coaxial cable and antenna feeder for the purposes of achieving the wireless coverage of GSM—R weak field and working out the technical specifications for GSM—R relay transmission system，including the equipment type，equipment component and main technical standard．
Research conclusions: Based on the studying the technical system of GSM—R digital mobile communication and related industry standards，the technical requirements for the system are proposed，including working frequency，C／I ratio， time delay and field strength coverage，the technical specifications are offered for the main system equipments，such as repeater，trunk line amplifier，leaky coaxial cable，antenna feeder and SO on，and combined with the concrete application of system in railway，the specific requests are proposed for the working condition and reliability of the equipments for guiding the engineering design，product manufacturing，construction and installation，equipment maintenance and quality inspection．
2009, Vol. 26 
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