Information, communication and entertainment are the fastest growing three major areas of the electronic technology; automotive electronics is an emerging market with great development prospects now, so the combination of the two is bound to lead to greater profits. The rapid development of automotive electronics field is entertainment system that combines the forefront application of three major areas---information, communication and entertainment, and has become the fourth largest system, other than the traditional three body transmission and safety systems.

Telematics is a new car application, meaning that it collects both functions of Telecommunication and Information. By the use of the different scenes, Telematics in positioning products can be divided into Portable Device and In-Vehicle which can base on the availability of external communications to further divide Telematics market into four pieces. Car GPS navigation and positioning system is a key position in the Telematics and has gradually become essential device in the automotive system, and continue to develop value-added features.

GPS system provides basic functions such as navigation information for driving, also developing new services. GPS and wireless communication technologies (such as GPRS/3G) can be combined for Telematics service providers to provide location information when the vehicle encountered difficulties in need of assistance, the service center received the position of the vehicle information in order to provide roadside assistance to owners; rental Car or bus, tour buses can also use GPS tracking team to play and control functions; In addition, the vehicles after the loss of this feature can also be adopted to reduce losses. GPS will be used in emergency cases the success of the e911 the United States and the European Union eCall scheme.

E911 belonging to the U.S. plans as part of an emergency rescue strategy, it requires the phone must have the targeting, to use as emergency communications purposes. The EU also made an emergency rescue vehicle-driving related eCall plan, which has a car equipped with the eCall function on-board equipment, which will be equipped with collision detection, GPS and mobile communication functions of the three, the first time automatically To the European emergency phone number 112 for communications, in addition to geographical location outside the vehicle, eCall could also set up to transmit data, voice and information to double to 112 the call-way to determine the appropriate rescue mode. Scheduled in September 2009, the EU should have all the new cars eCall function.

GPS systems architecture and analysis
GPS positioning system works is the use of satellite basic triangle positioning principle. GPS receiver device first to find three more satellite location, and then calculate the distance between each satellite and receiver, then it will be able to draw the coordinates of the receiver in the three-dimensional space. GPS system more than 20 satellites will send L1 and L2 frequencies respectively 1575.42 MHz and 1227.60 MHz signal. The ordinary civilian GPS receiver only receive L1, is 1575.42 MHz frequency signal.