GPS Navigation System Design And Implementation For Driverless Smart Vehicles

With the continuous development of science and technology, the amount of vehiclesincreased dramatically, resulting in deterioration of the road traffic environment, road trafficaccidents happen frequently. At present, more and more advanced technology applied toautomotive ADAS (advanced driver assistance systems), ADAS collect road environmentalinformation through a variety of sensors, and then help he driver to control the vehicle toavoid possible danger, improve traffic safety. Unmanned intelligent vehicles as the highestform of ADAS systems, is part of the intelligent transportation, which can effectively alleviatethe workload of the driver, reduce accident rates, and improve the utilization of roads andvehicles.Unmanned intelligent vehicles can independently arrive safely at the destination in theabsence of human intervention situation. Obstacle avoidance and navigation technology aretwo core issues in the unmanned vehicle research. This paper focuses on the unmannedintelligent vehicle navigation technology, paper first describes the development of unmannedintelligent vehicles and unmanned intelligent vehicles the basic requirements of the status quoat home and abroad as well as various navigation technology development status, define tasksand requires of unmanned intelligent vehicle navigation system, and then raise the overalldesign scheme of unmanned vehicle GPS navigation system. Its main contents are as follows:According to the design scheme of unmanned vehicle GPS (Global Positioning System)navigation system, unmanned intelligent vehicle system platform is built, including selectionand installation of GPS, computers and other equipment; rational design of the entire systempower section, with a small, easy to install, life is good and high reliability advantages. Torealize real-time data acquisition and processing, and the communication function betweenGPS receiver, PC, based and underlying control the serial communication technology is used.The electronic map is made, in order to meets the navigation system of unmannedvehicle. In this process we study data collection and analytic of GPS, which is installed on theunmanned vehicle, and the transform from latitude and longitude coordinates to local levelscoordinate. Two methods of curve are given according to the speed of data acquisition- vehicle.Turning points more valuable in the electronic map are screened.Navigation is dividedinto straight-navigation-mode and steering-navigation-mode. In the process of unmannedvehicle traveling, computer receives GPS data and extracts latitude and longitude coordinatesand heading angle information. Based on the pre-collected information of road, the systemcan confirm the position of vehicle. In the straight-navigation-mode, the navigation systemcalculates the deviation-angle β and the deviation-distance S from current vehicle location toideal trajectory. In the steering-navigation-mode, the navigation system calculates the idealvehicle steering angle θ and the distance S from current vehicle location to trajectory turned.Based on the driver’s driving experience, we build fuzzy control decisions for two navigationmodes, and deduce control system output variables.