Gps Arm
GPRS network of GPS by jekky
Abstract of Gps Navigation and GPRS wireless network based on a combination of navigation data, given the network based on GPRS GPS navigation unit graphic design.
By the GPS receiver, ARM microcontroller, GPRS wireless module, high-capacity Flash memory chips, and large screen TFT color LCD screen composition. The graphical navigation equipment to help users get an excellent geographic information navigation help, and the monitoring of important information.
Keywords General Packet Radio Service (GPRS) Global Positioning System (GPS) navigation graphics
Introduction With the recent development of technology and people’s communication and navigation technologies require further improvement to the global positioning system (GPS) position location technology-based navigation and control technology has been rapid development. GPS navigation and positioning technology in many industries have been widely used, such as traffic, navigation, security and many other fields. However, most have been put to use monitoring equipment, GPS navigation, there are few wireless network to transfer important data to the monitoring devices were functional. The rest of the data transmission with most of the equipment is also only a short message by sending an important way of data transmission and reception, but because of the short message itself has a delay uncertain, slow and easy to lose and other shortcomings, makes the whole system instability.
This system a new GPRS-based wireless networks to send important data, using a large screen TFT color LCD screen as a map display device, to locate the visual effects and the stability of data transmission capabilities have been greatly strengthening.
1 system components and features In the navigation device, where the core technology is the General Packet Radio Service GPRS and global positioning system GPS, the following brief the core modules of these two systems.
GPS (GlobalPositioningSystem, Global Positioning System), a U.S. defense navigation satellite system, is a global, all-weather, all-time, high-precision navigation and time transfer system. 24 satellites in six orbital inclination of 55 ° plane, the height of 20182km, cycle, nearly 12 hours. Two L-band frequencies for satellite launch one-way ranging signals to distinguish between different satellites using code division multiple access. It is a dual-use system that provides two levels of service. GPS system is a worldwide aircraft, ships, tanks, ground vehicles, infantry, missiles and space shuttles, etc. to provide all-weather, continuous, real-time, high-precision three-dimensional position, three-dimensional velocity and precise time, therefore, has a very high prospects for military and civilian value.
GPRS (GeneralPacketRadioService, General Packet Radio Service) is a system based on GSM wireless packet switching technologies to provide end to end, and wide-area wireless IP connection. More simply, GPRS is a high-speed data processing techniques, methods based on "group" in the form of sending information to the user hand. Although the existing GSM networks to GPRS is the third generation mobile communication technology evolution of the transition, but in many ways it has significant advantages. GPRS is a GSM system, the European Telecommunications Association, the packet data standard. It uses channel-bonding (GPRS is designed to present in a carrier frequency or eight channels to achieve binding) and Enhanced Data Rates for ways to achieve high-speed access, in theory, provide the air interface up to 115kbps transfer rates, so a number of mobile users At the same time sharing a radio channel, a mobile user can use multiple wireless channels. Actually sending or receiving data packets of users account for only a fraction of network resources, and the actual transmission network capacity only when occupied. GPRS system with existing GSM voice the most fundamental difference is: GSM is a circuit-switched system, GPRS is a packet switching system. Therefore, GPRS especially suitable for intermittent, sudden or frequent, small amounts of data transfer, but also to the occasional large data transfers. This feature is suitable for most of the mobile Internet and devices on the transmission of data requirements.
GPS-GPRS terminal composition of the vehicle positioning system shown in Figure 1.
Figure 1 Navigation approximate operational procedures: First, the terminal device through the built-in GPS navigation receiver module access to their specific location information, and ancillary information (such as speed and time, etc.). Then, through the built-in mass storage device in the map, to map the current location of its corresponding part in TFT color LCD screen is displayed, and also shows their status (such as speed, time, which received a control center news, etc.), set the GPRS module that comes with dial-up, implementation and Internet connection. The next step may be just obtained by Gps Receiver Module specific information transmitted to the specified network server.
Web server through a specific host computer software or the appropriate transfer protocol for the monitoring device to the current location, speed, real-time monitoring information, the terminal can be controlled through the network control to realize mobile terminal and control center of a two-way data transfer, to complete the controlled terminal operations, security status, technical condition monitoring.
2 Navigation System Principles Block diagram of the navigation system shown in Figure 2. The core controller, ARM7-based core AT91SAM7S64; GPS receiver module by the Swiss UBlox’s TIMLH, signal receiving ability; GPRS module uses Motorola’s G20 wireless module, features embedded TCP / IP protocol, using a simple performance stable, showing part of the company by the Sharp’s 8-inch TFT color LCD screen displays the current location through the color map, to achieve a good visualization. Off-chip storage device using a Samsung company’s high-capacity Flash storage body, the advantage of cheap, simple interface with the controller (High-speed SPI bus).
Figure 2 The navigation terminal main functions are as follows:
end-users query the current geographic location;
When was the current location information, the TFT LCD screen shows the map corresponding to the region;
navigation terminal can specify a network server to send their own information, such as geographic location, its status, etc.;
navigation terminal via the network server to receive control commands sent by the corresponding control;
end user can make calls through GPRS module.
System works as follows:
Navigation end
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