How to use Conghua GPS monitoring system?

In many application fields of GPS, vehicle application accounts for the largest proportion, accounting for about 50% of the total. The application of GPS vehicles is generally divided into two categories: GPS vehicle tracking system and GPS vehicle navigation system.

GPS vehicle tracking system

GPS vehicle tracking system can be divided into three categories: anti-theft alarm (including emergency rescue and medical assistance), dispatching command and fleet management (logistics and transportation).

GPS vehicle tracking system comprehensively uses GPS technology, modern communication technology and geographic information technology (GIS).

Using GPS technology, the GPS receiver in the GPS vehicle terminal locates the vehicle by receiving and processing GPS constellation signals, and obtains vehicle information, including the dynamic coordinate position (longitude, latitude and altitude), time and state of the vehicle.

Generally, DGPS technology, that is, differential GPS technology, is used in GPS vehicle terminal to improve the accuracy of vehicle positioning. The GPS receiver of the GPS vehicle-mounted terminal receives the vehicle positioning information, and the fixed GPS receiver of the monitoring center receives the monitoring center positioning information, which is transmitted to the GPS vehicle-mounted terminal through the wireless communication link. The GPS vehicle-mounted terminal comprehensively analyzes the positioning information received by its own GPS receiver and the monitoring center positioning information received through the wireless communication link to obtain the accurate positioning information of the vehicle.

Using modern communication technology, a wireless communication link is established between the monitoring center and the monitored vehicle. Through the wireless communication link, voice and data signals are transmitted in both directions between the monitoring center and the monitored vehicle. The GPS vehicle terminal uploads the vehicle information to the monitoring center. The monitoring center transmits the control information of a specific vehicle to the monitored vehicle, and the staff of the monitoring center need to call the vehicle driver to confirm the information.

From the existing wireless communication technology, the available communication networks include: GSM cellular mobile network, trunking or conventional network, satellite communication network (iridium system) and so on.

The design, networking and use of vehicle monitoring system based on conventional communication are relatively simple, but the scope of action is small; GSM short message service is used for positioning data transmission, with large coverage, high network reliability, high cost performance, national roaming, large user capacity and support for data and voice at the same time. It is very suitable as a public network communication platform for GPS vehicle monitoring system. This way can also greatly save the cost of using voice channels and overcome the previous voice communication obstacles such as busy channels and busy lines, but it is still inevitable that there is no service area, no SMS service, and sometimes there will be some delay. The trunking communication mode of trunking system is suitable for one-to-many communication in special wireless dispatching command network. For some special units, especially those with radio stations, few vehicles, mainly used for urban dispatching and high density requirements, it has incomparable advantages, but its network construction cost and coverage can not be compared with GSM system.

For the public GPS vehicle monitoring system with large capacity, wide coverage and complex business, GSM is the first choice.

At present, the short message (SM) service has been opened in the global GSM network. The principles and characteristics of GSM and SMS services are as follows: GSM (Group Private Mobile) digital cellular mobile communication has the advantages of high spectrum efficiency, good security, good stability, high integration, large capacity, open interface, strong anti-noise performance, flexible service, wide coverage, easy realization of national networking and good signal quality under various conditions in the coverage area, including

GSM also has the service of sending point-to-point short messages, and can distinguish between "Mobile Calling Point-to-Point Short Message Service" (SMS-MT/PP) that receives short messages, "Mobile Calling Point-to-Point Short Message Service" (SMS-MO/PP) that enables GSM users to send short messages to another GSM user, and "Cellular Broadcasting Short Message Service" (SMS-CB), another short message service that can send short messages regularly. Short message service is suitable for the service requirements of transmitting information with less than 160 characters. It uses common control channel of GSM, which does not affect the transmission of short messages during the call. Advantages of short message service: fast transmission speed, cheap single data transmission and no occupation of voice communication channel. Disadvantages: It increases the burden of the control channel, thus increasing the time for a single user to occupy the control channel, and the system needs to be modified accordingly. Because of the advantages of short message service and the data transmitted by GPS system is less than 40 bytes each time, the short message service of GSM system is more suitable for the requirements of "GPS vehicle monitoring system" than other communication methods. Except for a few blind spots in mountainous areas, other places are covered seamlessly. In terms of transmission delay, it is 20 -30 seconds from mobile phone to mobile phone (the delay of local transmission and remote transmission is basically the same), and it is 3 -5 seconds from mobile phone to SMS center and SMS center to mobile phone.

The monitoring center uses GIS technology to analyze the received vehicle information, convert the coordinate position of the vehicle into geographical position, display the position and running track of the vehicle on the electronic map, and record the information that the owner may be interested in, such as the position, speed, time and state of the vehicle. At the same time, the monitoring center also sends corresponding control information to the monitored vehicle in combination with the relevant information of the specific vehicle in the system, and downloads it to the monitored vehicle through the wireless communication link, and the control part of the GPS vehicle terminal controls the vehicle according to the received control signal.

Electronic map is an important part of GIS technology. The electronic map is a vector map, which can be infinitely enlarged, reduced, managed in blocks, seamlessly translated and switched at will, and can maintain the integrity of place names and characters. It has the function of mutual checking between pictures and texts, that is, input an adjustable street name map, click on a road and display its road name.

In the application of burglar alarm, there are two types of alarms: robbery alarm and burglar alarm. In case of robbery, the driver gives an alarm to the monitoring center by touching the alarm switch installed in the hidden position of the vehicle, which belongs to man-made active alarm; In the case of burglar alarm, when the driver leaves the vehicle, the remote controller triggers the GPS vehicle terminal to put forward monitoring requirements to the monitoring center. Once the vehicle state changes or the GPS vehicle terminal is damaged, the monitoring center will immediately give an alarm, which belongs to the passive alarm of the system. The driver can normally open the door to start the vehicle through the remote controller, and the remote controller can trigger the GPS vehicle terminal to request the monitoring center to cancel the monitoring.

After receiving the vehicle alarm signal, the monitoring center sends out an audible and visual alarm prompt and automatically tracks the alarm vehicle on the screen. Display the distance sign with the alarm vehicle as the center. According to the vehicle file, display various parameters of the alarm vehicle, such as number, model, license plate, color, owner, owner's phone number, etc. , and shows the nearby police configuration and rescue plan. The staff of the monitoring center will contact the owner according to the registered possible contact information (mobile phone, fixed telephone or pager, etc.). ) Confirm the alarm situation, report the case to the public security 1 10 system after confirmation, and track the vehicle all the way. The monitoring center is usually connected with the public security 1 10 alarm system or the public security GPS/AVL system. The monitoring center can disable the vehicle by remote control such as power failure and oil cut-off, and can also make the vehicle send out sound and light distress signals to help public security personnel solve the case. When the alarm processing is completed, the monitoring center will cancel the alarm of the vehicle.

Installing GPS vehicle monitoring system on vehicles can greatly reduce the possibility of stolen vehicles and their recovery, improve the detection rate of motor vehicle theft and robbery cases and reduce the detection cost of public security departments. Reduce the loss caused by vehicle theft and robbery (the insurance company does not fully compensate, and the handling process is painful and time-consuming); For insurance companies, installing GPS vehicle monitoring system can greatly reduce the amount of compensation for vehicle theft and reduce the probability of fraudulent insurance in vehicle accidents.

In the application of dispatching command, users mainly include public security, fire protection, public transportation, postal service, taxi and other industries. For the dispatcher, there is no satellite positioning, and after the vehicle is sent out, I don't know where I am. The dispatcher has no clue and it is difficult to dispatch effectively. With the help of GPS vehicle dispatching command system, the dispatcher can master detailed vehicle dynamic information, thus realizing efficient and scientific dispatching decision. In the taxi industry, when the dispatching center receives a call from a customer asking for a car, the GPS vehicle dispatching command system finds out the nearest empty car, provides services to the customer as quickly as possible, and reduces the empty rate of the car. In the postal express service, with the help of GPS vehicle dispatching command system, the dispatching center can dispatch the running postal vehicles in real time. By using GPS, users can automatically find the nearest postal vehicle, and provide geographical location information for drivers, which can optimize driving routes, improve speed and customer satisfaction, improve vehicle utilization, reduce the total number of express vehicles, reduce drivers and staff, and realize the promise of rapid recruitment. In the bus company industry, the dispatcher can know where the vehicles are, what the speed is, whether it is fast or late, and how the vehicles are distributed through GPS. Moreover, he can talk to the driver, understand the situation on the road, and take corresponding measures to ensure the normal turnover of vehicles. In addition, bus companies can achieve large-scale scheduling, that is, inter-line vehicle scheduling, not limited to in-line vehicle scheduling.

In the application of fleet management (logistics and transportation), the main users are emerging "third-party logistics" freight companies which mainly focus on long-distance freight. In the automobile transportation industry, once the car is driven out, it is difficult to carry out accurate management and control in the middle; The driving situation of vehicles in transit is greatly influenced by human factors, and the time and route of driving stops can not be effectively reflected, so it is difficult to guarantee the transportation time limit; The running state and technical state of vehicles can not be monitored and managed effectively in real time; It is difficult to determine the geographical location of vehicles, communicate information in time when danger occurs, and ensure safety. In short, it is impossible to carry out scientific and standardized management of vehicle operation. It is difficult to make full and reasonable use of transportation capacity because it cannot be scientifically and dynamically scheduled in real time. It is difficult to know the real-time parking space of the vehicle, and it is also difficult to determine the vehicle closest to the customer to realize dynamic monitoring.

With the help of GPS fleet management system, freight companies can save energy and increase efficiency. First of all, we can strengthen the mastery of freight vehicles, completely solve the "black hole problem" existing in previous transportation, that is, after the goods are consigned, the owner does not know the destination of the goods and cannot inquire. At the same time, we can reduce the occurrence of delayed departure and stopovers of freight vehicles and ensure the transportation cycle. Secondly, it can realize the query of relevant information of freight department, thus strengthening the empty car adjustment. Thirdly, it can greatly improve the flexibility and accuracy of freight organization and command, and provide basis for transportation command and decision-making. Fourthly, it can make the tedious freight dispatching work graphical and visual, reduce the workload of dispatching commanders and information exchange, improve the accuracy and efficiency of work, reduce the error rate of information exchange, and realize paperless office. Fifth, "transportation visualization" can improve the efficiency of freight companies and increase the income of enterprises.