Car Navigation

Navigation is to use on-board GPS (global positioning system) in cooperation with electronic map, it can be convenient and accurately tell drivers the shortest or to the destination path, is the fastest drivers good assistant.

The car's navigation profile:

With GPS satellite positioning system function, let you when driving a car anytime know you exactly. The car's navigation to its automatic voice navigation, the best path search and other function let you all shortcuts and high-speed motorcade, integrated office, entertainment functions allow you to easily driving, efficient trip! General navigation functions are DVD players, radio reception, bt, touch screen and matching function, intelligent trajectory backing up, tire pressure testing function, virtual six disc, backstage control function!

The car's navigation system functions:

Function module detailed instructions

GPS navigation satellite accurate positioning, best path search, automatic audio.

Navigation mode a variety of purpose input, five or more path retrieval customization mode, site setting mode, map location mode.

The national map with the national electronic map, provide thousands of city support, navigation map of latest more precise let you high-speed motorcade.

Path planning and destination and provide st, set the path planning and inevitably function.

Voice prompt kind real voice prompt, automatically broadcast driving road name.

Music appreciation audio-visual enjoy, relieve fatigue.

File management powerful resource management functions.

The car's navigation GPS positioning principle:

GPS is composed by 24 star, it is located at work from satellite ground 20200km above, evenly distributed in six rail surface (each track surface 4 star), orbit for 55 ° Angle. In addition, there are 4 star orbiting active backup satellite. Satellite distribution in making global anyplace, any time can be observed to 4 star above the satellite, and can maintain good positioning decoding the geometry precision of images. This provides in time in the continuous global navigation capabilities. Since the satellite in the position of GPS observations accurately knowable, we can get satellite receiver distance, use to the distance formula 3d coordinate, using three moons, can a formula of 3, work out observation position (X, Y, Z). Considering the satellite clock and receiver clock errors between, actually has four unknown, X, Y, Z and clock is poor, so need to introduce the first 4 satellite, form four equations solution, thus obtains the observation and elevation latitude and longitude.

In fact, receiver can often lock 4 star above, at this moment, the satellite receiver can press satellite constellation distribution into several small groups, and four star, then through the algorithm selected a group of used minimum error, so as to improve the precision positioning.

Since the satellite orbit, satellite clock exist errors, atmospheric troposphere, ionosphere to signal, and the influence of SA protection for civil policy that makes GPS positioning accuracy of just 100 meters. In order to improve the positioning accuracy, widespread use of the differential GPS (DGPS) technology, set benchmark stand (difference), GPS observation platform using the known precise coordinates with the benchmark stand comparison, observations, and concluded that a fixed number, and foreign release. After receiving this fixed number of receivers, and own observation value is used in the comparison, expunction most error, get a comparative accurate position. Experiments show that, using differential GPS positioning accuracy could be enhanced to 5 meters.

On-board navigation constitute

Vehicle navigation system mainly consists of navigation host and navigation display terminals two parts. The built-in GPS antennas receives from around the earth in the 24 star GPS satellite at least three single message of data information, thus determine automobile current position. Navigation host through GPS satellite signal definite position coordinates and electronic map data match, then can determine the accurate car in electronic map location.

On this basis, will realize turn-by-turn navigation, route recommend, information query, played AV/TV functions. Drivers simply by watching on the display screen, listen to audio, manipulate the remote control to achieve the above the hand function, and can be easily drive.

The GPS navigation system consists of two parts:

Part of the installation in the car's GPS receiver and display equipment composition; Another part of the computer control center, two parts by positioning satellites contact.

Computer control center is by the vehicle management department authorized and formed, it is responsible for monitoring at the designated observation within the jurisdiction of the dynamic and car traffic conditions, so the whole car navigation system there are at least two big functions: one is car trace monitoring function, as long as will have coding GPS receivers installed in the car, the car whether driving to everywhere of the computer control center by electronic map indicates that its location position; Another is the driving guide function, owner of each areas can be stored in electronic drawing traffic routes floppy disk, as long as in the car insert a floppy disk, receiving device screen will immediately showed the region's position and the current traffic condition, can input destination, programmed the best driving route, and the computer control center can accept the instructions, choose automobile driving route and direction.