Application of GPS in vehicle navigation

With the high-speed development of national economy and the speeding up of urbanization, China's vehicle ownership and road traffic volume increase sharply, especially in big cities, traffic congestion, obstruction, and as a result of the increase of traffic accidents, environment pollution and is one of the "urban disease" of the city. In view of this, will all kinds of advanced technologies applied to cars, in order to reduce traffic accidents, improve transport efficiency, lighten the working load of the driver thought arises at the historic moment, so that the GPS positioning system has the important development in the field of transport vehicles.
A, the composition of the GPS navigator
Car navigation system based on GPS global positioning system (GPS) is a new technology. Car navigation system composed of GPS navigation, autonomous navigation, speed sensor, gyro sensor, microprocessor, cd-rom drive, LCD monitor.

GPS navigator is to be able to help users to accurately locate the current position, and according to the established destination travel, through the map display and voice prompt two ways to guide the user to the destination of the vehicle driving auxiliary equipment.
GPS navigator includes two important parts: one is the global positioning system or GPS. Second, the car navigation system. GPS system is not enough, it can only send GPS satellite data, calculate the user's three-dimensional position, direction and movement velocity and time information, no path computation ability. Users of GPS receiving device to realize route navigation function also need a set of perfect including hardware equipment, electronic maps, navigation software of car navigation system.
To judge the merits of the GPS navigator, GPS satellite navigator can receives quantity and path planning ability is the key. Effective satellite navigation device can receive the more quantity, the stronger the signal, it is the current navigation work condition is more stable. If a navigator often search less than, or in the course of navigation satellite navigation frequently interrupt signal affected the normal work, it first of all, the quality is not pass to mention the advantages and disadvantages.
Second, path planning ability is also very important. Excellent navigator should be able to quickly and accurately based on the current parking and indicates that a user specified destination by time or distance (according to individual be fond of) path, shortest path arrangement is human nature, not the long road, driving safety and comfort. Path planning ability besides and processor and software related, map is also very important aspect. Mentioned above map is equivalent to a database that only the inside of the data more comprehensive and more new, navigator route design is more reasonable. Therefore map detailed degree and update capability is play a crucial effect on the merits of the navigator.
Again, car GPS  must be put in the car, so it needs to have a free rotation Angle, chassis adsorption ability strong support; A display effect is good, can see the screen map instructions; For safety we can't always stare at the screen, the sound loud, broadcast timely voice prompt function is very important; And navigator general battery life is limited, in the distance we urgently need a cigarette lighter can recharge device interface car charger. These are qualified according to the characteristics of the car involved in the essential condition of GPS. In addition like previously mentioned satellite capacity, computing power, software road map ability of accurate and updated navigation device, such as work base, also cannot be ignored.