Analysis and Design of Vehicle GPS System

　　Information, communication and entertainment are the three fastest-growing fields of electronic technology; automotive electronics is an emerging market with great development prospects, so the combination of the two will inevitably bring greater profit margins.

　　The fast-developing information and entertainment system in the field of automotive electronics combines the most cutting-edge applications in the three fields of information, communication and entertainment, and has become the fourth largest system in addition to the three traditional systems of car body, transmission and safety.

　　The Infocom entertainment system is an emerging vehicle application; it is called Telematics, which means that it combines the functions of Telecommunication and Information. According to different usage scenarios, Telematics can be divided into two types: Portable Device and In-Vehicle. These two types of devices can be used for external communication functions. The Telematics market is further divided into four major segments. Among them, the on-board GPS navigation and positioning has a key position in the Telematics system, and has gradually become a necessary device in the on-board system, and has continuously developed value-added functions.

　　In addition to providing basic functions such as navigation information for driving, the vehicle GPS system is also developing new services. The combination of GPS and wireless communication technology (such as GPRS/3G) can provide positioning information for Telematics service providers. When the vehicle encounters difficulties and needs assistance, the service center can provide road assistance for the owner after receiving the vehicle's location information; rental Cars, buses, and sightseeing vehicles can also use GPS to play the function of fleet tracking and control; in addition, this function can also be used to reduce losses after the vehicle is lost. Successful cases of applying GPS to emergency rescue include e911 in the United States and eCall in the European Union.

　　The e911 plan of the United States is a personal emergency rescue strategy, which requires that the mobile phone must have a positioning function for emergency notification. The European Union has also proposed an eCall plan related to car driving emergency rescue. The plan is to equip cars with in-vehicle equipment with eCall function. The unified emergency phone number 112 is used for notification. In addition to the geographic location of the vehicle, eCall is also set to transmit data, allowing the 112 operator to determine the appropriate rescue method in both voice and message methods. It is scheduled that after September 2009, all new cars in the EU must have the function of eCall.

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