1、 System Introduction
The safety protection system for this locomotive operation is a system that provides safety protection against accidents such as crossing and closing shunting signals, hitting soil barriers, derailing derailers, crossing station boundaries, entering non electrified areas, and locomotive conflicts that may occur during the operation of this locomotive in the station yard and locomotive depot. The system consists of ground equipment and locomotive onboard equipment.
The system collects information such as locomotive position and speed, combined with route and signal status, and provides real-time station information and locomotive position to the driver through graphics and sound based on high-precision track, switch, and signal position maps of the station. It also provides graded warnings for the target distance to the driver.
The system adopts Beidou satellite differential and satellite blind spot high-precision positioning technology to achieve accurate positioning of locomotives in all areas and all weather conditions; Based on the adaptive push technology of station information related to locomotive position, drivers can grasp the operation situation in real time, and achieve remote monitoring and early warning of locomotive operation situation, effectively preventing the occurrence of locomotive operation accidents.
2、 Research and Development Background
At present, the main locomotives operating on the entire railway have achieved equipment control when pulling trains, but during shunting operations, they rely entirely on the driver's manual confirmation of ground signals and operation of the locomotives. Due to the fact that locomotive operations are generally carried out at busy stations or marshalling yards, accidents can have a significant impact on railway transportation. To this end, a safety protection system for locomotive operations has been developed to reduce the occurrence of operational accidents, with good safety and economic benefits.
3、 Equipment composition and functions
The system consists of ground equipment and onboard equipment. The ground equipment mainly consists of Beidou ground-based enhanced base stations, UWB positioning equipment (ultra wideband positioning system), station information collection and processing equipment, map servers, MTPP servers, and display terminals; Vehicle mounted equipment mainly consists of antennas, hosts, and display screens. Dual channel (mobile/telecom/Unicom) 4G transmission method is used for real-time data transmission between on-board equipment and ground equipment.
Beidou ground-based enhanced base station and satellite blind spot high-precision positioning technology (used for locomotives without satellite signals under wind and rain shelters), achieves precise positioning of locomotives with a positioning accuracy of less than 30cm. By combining with high-precision station maps, it can accurately distinguish the track and real-time position of locomotive travel, thus matching the current route situation (red and white light bands) and signal status.
The station information collection and processing equipment and map server interface with CTC equipment through the MTUP security platform to collect locomotive route information and signal status; And push the pre-set information such as the end line soil barrier, station boundary markers, contact network endpoint markers, derailer position and status to the onboard equipment in real-time station graphics.
The ground display terminal interfaces with station information collection equipment to display real-time station signal status and track information within its jurisdiction, and can centrally display the operation and location status of locomotives within its jurisdiction.

Vehicle mounted devices can receive real-time ground equipment information and interact with ground servers for data exchange. They can graphically display station, train, location, and other information pushed by ground servers to drivers through displays, and provide sound alarm prompts based on pre-set threshold values.

4、 Technical solutions
1. Comprehensive data collection and transmission of station yard
The comprehensive data collection of the station is obtained through the CTC interface, and the data content includes: station signal status data, switch positioning information data, and route light strip information data. These data are encrypted and packaged before being transmitted to the 'information server'. Monitoring centers at all levels can access data associated with this client by accessing the server; Push location, station, signal display and other related information to the onboard equipment based on its location information.
2. High precision station map
The high-precision track map of the station is saved on a dedicated server and can be remotely added, updated, maintained, and managed using authorized clients. All onboard devices and monitoring centers can download map data in real-time.
3. High precision ground positioning
Beidou ground-based enhanced base stations are set up at suitable stations along the line, with a coverage area of a radius of 30Km; Vehicle mounted devices obtain differential data from the nearest base station by accessing the base station server; For larger integrated wind and rain shelters at stations, UWB high-precision positioning devices can be installed as needed to achieve precise positioning throughout the entire area.
4. In vehicle equipment
The onboard equipment consists of a host and a display, with the host embedded with a high-precision Beidou positioning module and supporting dual channel 4G network transmission function.
4.1 Vehicle mounted equipment positioning scheme
The on-board host is embedded with a Beidou high-precision positioning module, which obtains differential data by accessing the base station server, and receives the differential data from the server through the 4G network. After a specific algorithm, the high-precision latitude and longitude position data of the main locomotive is calculated. On the one hand, the matching station map and station information are displayed on the on-board display, and alarm prompts are given according to the situation. On the other hand, it can be transmitted back to the location server, which can be opened to applications that require high-precision location of the local machine in the entire road network, such as ground monitoring centers, forming a part of the big data of driving information.
4.2 Sound prompt broadcast
By combining the comprehensive information of the station yard pushed by ground equipment with the distance of the target parking location, drivers are alerted through graded warning sounds.