Research On Locomotive Video Monitoring System And Wireless Dump Technology

In recent years,railway transportation has dominated the transportation system of our country.At present,it has entered the critical stage of high speed and heavy load.The safety problem of railway transportation is not only an important direction of national concern,but also an important index of railway units at all levels.This thesis proposes a network video surveillance system,which is specifically produced for rail transit vehicles.The system combines the characteristics of rail transit,is based on high-definition video surveillance technology,and receives on-board information from other locomotive equipment and superimposes and stores the video data obtained from the network camera,and then uses the vehicle-ground large-capacity wireless dump technology Transmit the data to the ground,these data will be the main basis for the ground staff to analyze the fault.In this system,network cameras are used to collect video during driving,audio equipment is used to collect audio,and technology is innovated and improved to build a powerful monitoring system suitable for automotive environment applications.The main work of this thesis is to store a large amount of data(mainly video data)generated during operation,and store these data in the dump host.The POE module in the dump chassis is connected to one or two high-power transmission equipment;When the train arrives in the warehouse,the POE module starts to supply power so that the transmission equipment starts to work,and forwards the data stored in the on-board dump chassis to the ground server.In the whole process,the POE module plays the role of controlling the transmission equipment.The POE module in the large-capacity dump chassis studied in this thesis can not only realize the power monitoring of the PD device receiving the power supply by monitoring the voltage division of the sensing resistor,but also can be realized by configuring the register of the power management chip LTC4291 Control its four-way power supply interruption and output power.Because this solution is under the IEEE802.3bt protocol,it can achieve dual90 W Ethernet output,so it is basically compatible with all PD devices,and can control the power interruption and power of each channel separately;and At the same time,the power of the connected device can also be distinguished by reading the register,therefore,the transparency of the protocol and power management can be completely achieved.Finally,laboratory commissioning tests were carried out on the produced samples to confirm that they can achieve ideal power monitoring and power management and meet the expected requirements.