| As an important portion of Intelligent Transportation System (ITS), vehicle navigation attracts more concern than before. Its research is of great significance. We can direct and supervise vehicles running in urban areas effectively, improve the thoroughfare capacity, allocate and dispatch resources reasonably, guard against accidents and deter crimes aiming at vehicles.The first and foremost problem for vehicle navigation is to positioning real-timely and exactly. Though Global Positioning System (GPS) is used widely at present, it is restrained due to its intrinsic errors in existence. Especially when a vehicle is running in a city canyon (a place where high buildings are on its both sides) or in a jam-paced place, things get more awful. In these situations, GPS signals are kept out. These factors will induce the decline of the position precision, which means the position precision can't meet the requirement of the original intention.The integrated navigation and position system, composed of GPS and map matching technology, is applied in this text. The higher road network information in the digital map database is used as the moulding board to revise positioning errors of the receiving datum. According to the result of this pattern recognition process, the exact location will be displayed on the digital map. The experiments for operating vehicles demonstrate that the degree of accuracy and reliability of integrated navigation and positioning system, compared with independent GPS navigation and positioning system, is enhanced, vehiclular operation efficiency and security are far and away strengthened and the thoroughfare capacity is improved. As consequence, traffic congestion can be moderated with effect and the automation of transportation management and the intelligence of the vehicular drive will be realized.
|
PDF Full Text Request