Command Dispatch Vehicle Terminal

Vehicle dispatch systems come in various forms, with the primary function being a new type of Internet-based vehicle management platform. It is suitable for large transportation enterprises, utilizing information technology to achieve vehicle positioning, tracking, monitoring, two-way voice intercom, command, vehicle control, and other functions, while providing complete vehicle statistical reports and powerful data analysis capabilities. It simplifies enterprise vehicle management, improves processes such as internal vehicle allocation and maintenance, and significantly enhances enterprise management efficiency and economic benefits.
A large-scale integrated management and dispatch system is to be built, centered on dual-system positioning, monitoring, dispatch, and management using GPS and BeiDou satellites, integrated with a vehicle business management system. This project includes the vehicle-mounted terminal equipment and the construction of the entire central system management platform, with each vehicle supporting video image transmission.
The global satellite positioning system (GPS) and BeiDou positioning system are used in dual-system mode for vehicle positioning, monitoring, and command dispatch. Positioning and tracking information is transmitted via the GPRS data channel, along with two-way communication, enabling supervision of various types of local vehicles.
Based on the functions of data collection, data communication, and business processing, the system is divided into the following three main parts:

1. Vehicle-mounted terminal: Includes GPS and BeiDou receivers with corresponding antennas, GSM/GPRS modules, control units, alarm buttons, etc. Responsible for receiving and reporting GPS positioning information, alarms, and rescue requests;
2. Wireless communication link: Responsible for data transmission between the vehicle terminal and the monitoring center, including vehicle positioning/automatic alarm information and monitoring center control commands. This part mainly uses GSM/GPRS; as long as GSM/GPRS coverage is available, the system can operate stably;
3. Monitoring and dispatch center system: The monitoring center serves as the "nerve center" of the entire system, providing full-process tracking.

Main Functions and Structure
System Composition Structure

This vehicle intelligent monitoring and management system project adopts a hierarchical management architecture, where users manage corresponding vehicle terminals according to different hierarchical permissions.

1) Features of the B/S Structure System
Google Maps is selected as the map, requiring domain binding with a Google ID. All positioning information is displayed on Google Maps, mainly used for remote Internet management. The system can be accessed online at any time and from any location without downloading or installing any software. It supports cross-regional, multi-site, and multi-branch business management.
2) Features of the C/S Structure System
The C/S structure is mainly used for secure vehicle management within a LAN. MAPINFO offline maps are used, which can be freely edited and defined for a specific area to meet user requirements. The C/S structure system is mainly used within a LAN, where clients log in to view and control vehicles.
Monitoring and Dispatch Center Software System
This monitoring, management, and dispatch system consists of a central database and five major software modules: communication module, recording and monitoring module, management module, vehicle monitoring and dispatch system, and GIS geographic information system. The system has excellent scalability.
Central Database
The central database is the core of the entire monitoring and management system, implemented using a large-scale database to ensure processing of high-volume data traffic.
The database system requires a high-performance server and mainly stores basic information of all vehicles, vehicle terminals, and users, as well as historical data and operation records. It mainly stores the following data:

• Vehicle terminal attribute information
• User information
• Vehicle registration information
• Network subscriber information (including individual and group users)
• Historical positioning information records
• Central command records
• Automatic alarm information
• Backup of information routing tables in the communication server

Software System
Communication Module
This part mainly handles data communication and network management functions, supporting DDN leased line/Internet or GSM/GPRS communication methods, and is compatible with multiple leased line access protocols from China Mobile, China Unicom, China Telecom, etc. Its functions include:

• Support for ultra-large information capacity (GPRS)
• Support for multi-level architecture (suitable for ultra-large-scale applications)
• Support for multiple access protocols (supporting multiple SMSC protocols and ISMG gateway protocols from China Mobile or China Unicom)
• Support for multiple communication channels for information exchange
• Support for complete communication log recording and storage
• Support for interface hot-start functionality, allowing online removal of major modules
• Support for cascading of similar communication gateways
• Support for simultaneous diverse access from multiple sub-centers (DDN, PPP, VPN, ADSL, etc.)
  Management Module
  System management is implemented through dedicated database management software, which manages system security, vehicle, and user data, providing functions such as add, delete, modify, save, query, and print.
  Vehicle Management implements unified vehicle registration, modification, and editing management. Vehicle information includes basic information, service information, status information, and location information, considered together with the vehicle GPS/BeiDou monitoring and positioning system, providing management service interfaces.
  Video Management
  Provides permission-based functions for vehicle wireless video information management, viewing, and retrieval.
  Vehicle Monitoring and Dispatch System
  The system combines GIS, GPS, MIS, and other platforms to present users with a visualized tracking interface and provides multiple means of querying geographic information, allowing users to obtain easy-to-understand and relatively accurate GIS information in real time.
  Positioning and Data Transmission The monitoring center can track the vehicle's current position, speed, direction, etc., at any time. Vehicle positioning can be monitored in multiple modes, including fixed-point, timed, fixed-distance, fixed-speed, fixed-route, fixed-range, and fixed-location, with functions such as single-point positioning, continuous monitoring, and key target tracking. The monitoring status of the vehicle is displayed on the system interface.
  Vehicle positioning uses dual BeiDou and GPS positioning, also supporting standalone GPS or standalone BeiDou positioning, ensuring positioning accuracy with a deviation of no more than 5 meters, speed accuracy of 0.01 km/h, cold start acquisition time of less than 40 seconds, and re-acquisition time of 2 seconds. The vehicle terminal uses the 3G/GSM network to transmit data information to the central platform, supporting manual and automatic reporting of the vehicle's current position. The minimum automatic reporting interval is 2 seconds. Functional requirements are as follows:
• Collect time, longitude, latitude, speed, altitude, direction, and vehicle-related status information, and upload it to the monitoring center via wireless communication;
• Positioning status information such as time, longitude, latitude, speed, altitude, and direction can be stored internally in the device; capable of storing 10,000 data points, with recording time accuracy within ±5 seconds cumulative error over 24 hours;
• Upon receiving positioning requests from the primary or secondary monitoring center, positioning information can be uploaded, and real-time reporting to the corresponding center can be terminated as instructed by the monitoring center; the time from the terminal receiving the real-time positioning request from the monitoring center to the terminal response is less than 10 seconds;
• When the vehicle is parked for an extended period, positioning information is uploaded at a set interval, with the interval configured by the monitoring center;
• The terminal uploads positioning information at a set interval, with the time configured by the monitoring center; in driving status, the minimum scheduled reporting interval is 5 seconds, the maximum scheduled interval is no more than 60 seconds, and the factory default is 30 seconds;
• Positioning information upload is triggered based on distance, with the distance interval configurable by the monitoring center; the factory default distance is 200 meters;
• In the event of manual alarm, positioning information is uploaded immediately.
  Track Playback
  The monitoring center visually displays the vehicle's position and driving trajectory on the electronic map. Historical data can be queried at any time to replay the driving route of a specified vehicle within a set time period, and track playback data can be exported. The vehicle terminal also has built-in historical track storage, capable of storing 30,000 track points even in network dead zones.
  Voice Dispatch The system supports remote monitoring of sounds inside the vehicle and enables two-way voice intercom, allowing voice instructions to be issued to the vehicle at any time.
  Alarm monitoring: The vehicle terminal is equipped with a call handle, earpiece, and microphone for direct voice alarm or voice monitoring in emergency situations.
  Remote monitoring: In the event of an alarm, the microphone is automatically turned on and the speaker is turned off for monitoring; during the handling process, monitoring can be turned on or off as needed.
  Digital recording: Digital recording is stored during monitoring and can be analyzed and replayed as needed.
  Voice dispatch: Broadcast public information and conduct voice dispatch.
  Vehicle Control
  The system supports remote vehicle control, including remote cut-off/restoration of the vehicle's fuel and electrical circuits, and remote restart of the vehicle terminal from the monitoring center.
  Terminal photo capture: Supports snapshot, scheduled capture, and alarm button-triggered capture.
  Fuel level detection: Can connect to a fuel level sensor to detect fuel consumption.
  Temperature monitoring: Can connect to a temperature sensor for measurement.
  Vehicle Alarms The system supports multiple types of alarm information:
• Robbery alarm trigger: When in danger, pressing the robbery alarm button sends an alarm to the monitoring center.
• Main power failure alarm: When the backup battery is active and the main power is disconnected, an alarm is sent to the monitoring center.
• Overspeed alarm: The monitoring center sets a speed limit; when the vehicle exceeds the limit, an alarm is sent to the monitoring center.
• Fatigue driving alarm: When the driver drives continuously beyond the set time, an alarm is sent to the monitoring center.
• Parking timeout alarm: When the driver parks continuously beyond the preset time, an alarm is sent to the monitoring center.
• Zone entry/exit alarm: When the vehicle enters or exits a set zone, an alarm is sent to the monitoring center.
  Active alarm: When the vehicle is illegally hijacked or involved in an accident, the user can actively report an alarm to the monitoring center.

GIS Functions
Image Display
Vector maps can be overlaid with other image layers, such as satellite photos and aerial photos.
Map Unlimited Zoom
The map supports unlimited zooming, with multiple operation methods including clicking to zoom in/out by one level, selecting a region on the map to zoom in/out to fill the entire display area, and zooming to a specific scale. The entire zooming process is smooth and flicker-free.
Layer Control
Through the layer manager, the visibility and queryability of each layer on the map can be controlled.
Information Annotation Allows annotation of information points on the GIS electronic map, with information points supporting permission-based entry, editing, and modification.
Third-Party Business System Interface
It should provide real-time dynamic positioning and status information data interfaces for third-party positioning application systems, and provide unified GPS/BeiDou information services for other business systems.