1 system main components
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1.1 Vehicle system
1.1.1 GPS Processor (GPSPU)
It is an information system installed in the vehicle for continuously calculating the position of the vehicle. It has the characteristics of small size, unsmooth surface and light weight. It can communicate with the command center or as a stand-alone data logger (with black box).
Components of GPSPU:
High quality GPS receiver; a microprocessor; black box memory; modem for communication; interface for peripherals; personal transponder (optional); differential receiver (optional).
It is an internal GPS receiver designed for moving objects. It accepts 12 channels and a sensitive RF front end. Scientific software algorithms make the device in harsh environments, such as tall buildings and large trees in the area. Also has good performance. It is able to locate quickly and quickly regain the signal after the signal is lost.
1.1.2 Microprocessor
There is a processing chip for the internal operating system in the GPSPU box. It reads the position output from the GPS receiver and stores the current format information in the motherboard's memory (or transmits the data back to the control center via an optional internal modem). Most of the functionality of the system's GPSPU is provided by its software, and the system is maximized to be compatible with the user's system. It can control input/output and peripheral attached equipment. The functionality of most microprocessors is controlled by the control center.
1.1.3 black box (data record)
The GPSPU continuously records the location information of the vehicle and stores it in the memory of the motherboard. The frequency of recording and recording of data can be set to suit different needs. Because the fixed memory is a solidified memory, even if the GPSPU system is permanently dead. It also protects the data very well. The location information recorded in the GPSPU memory generally includes the vehicle identification number, date, time, latitude, longitude, speed, GPS status, and the like.
1.1.4 Communication Options
The VTS system uses the most advanced technology available today and is compatible with all current standard communication networks. Any standard communication modem can be used when remote monitoring and operation is required with a communication connection device (eg RF, GSM modem). Most communication modems can be loaded onto the GPSPU system.
1.1.5 Interface of peripheral devices
The standard GPSPU has three photoresist interfaces and four open electronic output ports that can be used to receive or return electronic signals to other devices, such as door locks, alarms, sensors, and more. It also provides two serial communication and one bus interface for the connection of mobile digital terminals, displays/keyboards, differential receivers, alarm systems, vehicle control devices, etc.
1.1.6 strap forwarding/receiver
It is designed for personal safety, and the in-vehicle system can accept signals sent by the strap-type Repeater/receiver to perform multiple tasks. The effective linear distance is within 100m.
1.2 Control Center
The Control Center provides the operator with the ability to manage all vehicles at the center. A control center can operate multiple communication networks simultaneously to manage multiple fleets. The Control Center provides optional client server settings and can also provide a SQL database for management, including group, vehicle type, vehicle identification, vehicle location, driver and more.
If the administrator of the control center needs or has already made an automatic setting, the location information will be transmitted to the control center via the communication network. After updating the location information, the control center will process the information and display a digitized electronic map of the vehicle location. And an improved map of the surrounding environment can be provided in the electronic map.
The control center can manage the vehicle and display its trajectory on the electronic map. All incoming information will be recorded in the SQL database of the Control Center for later lookup, display and analysis. The operator of the control center can instantly query the status of the GPSPU module or recorded location information, and can control the basic functions of the GPSPU, as well as peripheral peripherals.
1.2.1 Instant tracking
The control center can track the location information of the vehicle according to the fleet, the type of the vehicle, the identification number of the vehicle or all of the above information. All collected information will be stored in a database for future search and analysis.
1.2.2 Recording information
The control center can query the location information of the vehicle according to the fleet, the type of the vehicle, the identification number of the vehicle or all of the above information, and store all the location information in the database.
A powerful system tool that allows the operator to query information recorded in the GPSPU or Control Center database by text or electronic map by selecting a variable response rate and the date/time selected by the operator.
1.3 Communication Network
The system uses today's most advanced communication technology to connect to any standard communication network today. The communication network provides a number of functions such as a connection between the GPSPU system and the control center, as well as remote control of the operator's GPSPU system. When the operator queries the historical position of the GPSPU system, or immediately tracks the real-time work of the vehicle, the location information of the vehicle is transmitted back to the control center via the communication network. Additional peripherals can also be remotely controlled via a communication network. The system provides a variety of communication networks to accommodate a variety of different communication options as well as voice communication options.
Communication network interface
· Existing personal radio networks (digital or analog networks)
·Digital Network - Digital Cellular Network
·Private data network
· Existing clustered radio network
·Satellite network
And it can provide two communication options at the same time.
2 system principle
The in-vehicle system receives satellites (a total of 24, distributed in an average of 6 satellite orbits) and generates data about the coordinates of the satellite itself. The user receiver can calculate its position based on the data sent by the three satellites. Data, for mobile vehicles, the data of the fourth satellite is needed to calculate the moving speed and direction of movement of the moving vehicle. The coordinate data is transmitted by the modem. Through the communication network, the control center restores the coordinate data and other information sent back by the vehicle system through the modem, matches the electronic map on the workstation, and displays the current correct position of the tracked vehicle on the map, thus monitoring The center can clearly grasp the macro dynamic position information and operation status of the vehicle.
3 system function
· Instant tracking system
·Data loading
·Intelligent allocation
· Supervision of goods and drivers
·Mobile communication
·Regulation of transportation
·Line display and analysis
·Automatic emergency tracking and communication
·Personal security
·Driver assisted navigation
·Rescue on the road
·remote control
4 system advantages
·High quality, advanced technology, low power consumption, modular design
· Multiple network communication interfaces (with two-element option)
· Convertible communication modem options
·GIS workstation
· Option to record data update rate and record rate
· Provides the most recent location information where there is no satellite signal
·The GPSPU module is small, lightweight and can be reprogrammed
· Full-featured display and analysis tools
· Data compression and encryption options
· Control Center notifies GPS failure function
· Remote control of vehicle functions (lighting, locking, alarm, ringing, etc.)
· 24 hours of supervision and contact with the vehicle
·Connect multiple external devices
5 System technical indicators
·System capacity is one graphic control computer can control 2048 vehicles
· The switching of the electronic map reaches the blanking time of the map <2s
· Positioning accuracy is the positional accuracy of the vehicle 30m RMS (SAon), 15m (SAoff)
The GPS data query speed is 1 car/s.
6 system performance indicators
· The shock resistance of the entire vehicle system meets the standards of MIL-STD-883
· GPS satellite receiver
Receive mode: 12 channels of parallel reception
Tracking method: Full-field (All-In-View)
Protocol standard: NMEA-0183
Receive frequency: L1 (1575.42MHz) C/A code
Signal level: TTL
Dynamic speed: ultimate speed: 1800km / h acceleration: 5g
Accuracy: Single point positioning: 26m RMS (SA on)
Differential positioning: less than 1m
Temperature: Working temperature: -30 ° C ~ 70 ° C
Shutdown temperature: -40 ° C ~ 80 ° C
Humidity: Working humidity: 20% to 98%
Shutdown temperature: 20% to 99%
Power consumption: 50mA
Power supply voltage: DC 12V
Typical hot start time: <10s
Automatic initialization time: <1min
Recapture time: 1.6s
· Communications network
GSM (900MHz) performance standard
Actual transmission efficiency of the system: information of 12 vehicles/s
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