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With the development of science and technology, GPS technology came into being, the three-dimensional navigation is the primary function of GPS, a new car navigation system is developed on the basis of GPS technology, GPS navigation systems and electronic maps, the radio communication network and computer The vehicle management information system, can achieve many of the features of the vehicle tracking and traffic management, with China's economic development, and the gradual deepening of the rapid construction of high-grade highways, and GPS technology in road works and transport The application will be more extensive and in-depth, and play a greater role. 3D navigation is the primary function of GPS for navigation of aircraft, ships, ground vehicles and walkers can use the GPS navigation receiver. The car navigation system is a new technology developed on the basis of GPS. It consists of a GPS navigation, and self-discipline navigation, microprocessor speed sensor, gyro sensor, CD-ROM drive, the LCD display composition. GPS navigation is by GPS receiver receives GPS satellite signals (three or more) to get the point latitude and longitude coordinates, speed, time and other information. In order to improve the accuracy of vehicle navigation and positioning, the commonly used differential GPS technology. When the car driving to the underground tunnels, high-rise buildings, highways and other cover objects and capture the GPS satellite signals, the system can automatically import the self-navigation system, this time by the speed sensor to detect the moving speed of the car, through the micro-processing unit data processing directly from the velocity and time to calculate the distance ahead, and the gyro sensor to directly detect a forward direction, the gyroscope can automatically store all kinds of data, even in the replacement tire temporary parking, the system can also be re-set. Measured by the GPS satellite navigation and self-discipline navigation, vehicle location coordinates, the way forward with the actual traveling route track there is a certain error, to correct the error between both, so that requires the use of maps and route map unified matching technology, plus a map matching circuit, the vehicle traveling route on the road of error in the electronic map real-time correlation matching, and automatic correction, In this case, the map matching circuit through the finishing process of micro-processing unit for quick, get the car in the correct position on the electronic map to indicate the correct driving line. CD-ROM used to store road data and other information, LCD monitors used to display navigation information. GPS navigation system with electronic map, the radio communication network and computer vehicle management information system, can achieve many of the features of the vehicle tracking and traffic management, These advantages are small businesses and non-professional satellite navigation and positioning the company can not reach. Therefore, after-sales service is a major factor to consider to purchase products. In addition, the price of the product is one of the major factors considered by consumers when purchasing products, Main products: car dvd player, car gps and car dvd are with good quality, consumers want to buy products affordable, but the results have not necessarily got what they wanted. On the market today, a lot of navigation products, "cheap" but not "poor quality". The so-called ultra-low-priced navigation products, even the cost can be achieved, their products can achieve the "navigation" effect can imagine.
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