4g cat gps tracking consists of three main components: the on-board terminal, the wireless data link and the monitoring center. The following is its system composition block diagram:

GPS vehicle monitoring system

The construction of GPS vehicle dispatching system must first consider the requirements of monitoring coverage, real-time, dispatching service, vehicle capacity, refresh rate, etc., to select the appropriate wireless data link and electronic map, and develop the corresponding business software to meet the requirements of users. As far as the current GPS vehicle tuning system is concerned, the wireless data link is more used for GSM communication mode, which is mainly due to its wide coverage, no need to erect base stations, and can achieve voice/SMS and other functional advantages. Of course, GSM also has disadvantages, and we will compare its advantages and disadvantages with trunking communications and conventional radio.

Vehicle terminal

Vehicle terminal equipment includes: control unit (CPU), display unit (optional), GPS, GPS antenna, GSM mobile phone (or other communication module), burglar alarm (optional). The main functions are:

- Burglar alarm function

When an emergency occurs, the user can trigger a hidden alarm button, and the vehicle unit will automatically transmit the position data in the GPS receiver to the monitoring center through the short message function of the GSM mobile phone.

- Navigation function

GPS provides the accurate position, speed and direction of the moving target and other data, the non-differential positioning accuracy is about 10 meters, and the differential accuracy is 3-5 meters. The system can navigate through the dispatch center, and can also store an electronic map on the terminal, and the location of the moving target on the electronic map can be displayed on the display unit in real time. According to the destination, choose the best route to travel, and can do yaw alarm.

- Call function

The car GSM mobile phone can make voice calls, and the phone can be removed and used normally when the user leaves the car. Several communication modes are generally required to be compatible with the number of words, which can be controlled according to the command center's instructions to achieve the function of the number of words conversion. For example, if cluster communication is used, after the vehicle alarm, the monitoring center will approve the channel to monitor the situation in the car.

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