During on-track railway construction operation,the construction personnel have to leave the track when a train approaches,to avoid collision between the train and the personnel and machinery.Therefore,accurate and reliable train approach early warning is critical for railway construction safety.This paper describes the application of the secondary radar technology to train approach early warning.It presents an analysis of the system application scenarios,a description of the working principles and communication scheme of the radar communication module,and proposes a design of the onboard and wayside devices.The test results show that the train approach early warning system based on secondary radar meets the requirements in railway construction operation.
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