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In Car Information Service System by jodie mht
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In Car Information Service System |
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Automotive
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Telamatics the technical features of full performance IT integration. It is applied to four kinds of technology, namely satellite positioning technology, cellular communications technologies (2G/3G), vehicular access / truck collaborative information exchange technology and embedded systems. The first satellite positioning technology. Satellite positioning system, including the U.S. GPS system, China's Beidou system, the EU's Galileo system. With satellite positioning technology, electronic maps, geographic information systems can complete the land navigation. The widely used GPS technology. Commonly used to improve the inadequacies of the GPS, wireless auxiliary AGPS technology to improve the positioning speed. Its fundamental principle is: the network to the vehicle terminal to provide assisted GPS information, such as GPS to capture ancillary information, the GPS positioning auxiliary information, the GPS sensitivity auxiliary information, the GPS satellite work status information such as the mobile station position calculation of the auxiliary information (such as GPS history books as well as revised data, GPS ephemeris, GPS navigation message, etc.). Using this information, the vehicle terminal can quickly capture the satellite and receives the measurement information, which calculated the vehicles current location or to pay the background location center to calculate the position. In the CDMA network, the application is GPSOne mobile positioning technology. Organic combination of GPSOne to two kinds of wireless assisted AGPS and triangulation positioning technology to achieve high-precision, high availability and high-speed positioning. The triangulation method is to measure the time difference from the three base station signals to determine the terminal in a specific hyperbolic in any two base stations, multiple hyperbolic point of intersection is the location of the terminal. The environment of the two positioning technology can not be used, GPSone will automatically switch to the Cell-ID positioning mode, thereby ensuring the positioning success rate. Than a simple GPS technology has the following characteristics (Table 1): ? High precision: in good conditions, the positioning accuracy can reach 5 ~ 50m. ? Positioning time: the completion of a position just a few seconds to tens of seconds time. ? wide range of applications: in the open field of vision or the skyscrapers of downtown, indoor, as well as many other traditional positioning does not work environment can be successful for positioning. ? Positioning devices are small: the positioning functions into a core CDMA chip size,Main product: bmw dvd and audi dvd power consumption and cost were not a big difference. Remote monitoring and autonomous mobile positioning. The second cellular communications technology (2G, 2.5G, 3G). 2G/3G cellular communications technologies for information transfer for a reliable, wide coverage, the safety of the underlying network. Cellular technology, GPS can only complete a simple positioning, navigation functions, information service out of the question. The cellular communication networks need to have a complete road coverage and sufficient bandwidth to have high security and can accommodate a large number of real-time online users.
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