1、 PDF外文：http:/ 中文5697字 现代控制理论 题 目 智能交通信号控制 &
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3、bsp;专 业 指导教师 二一 三 年 12 月 15 日 Intelligent Traffic Signal Control Using Wireless Sensor Networks Vignesh.Viswanathan and Vigneshwar. Santhanam Abstr
4、act:The growing vehicle population in all developing and developed countries calls for a major change in the existing traffic signaling systems. The most widely used automated system uses simple timer based operation which is inefficient for non-uniform traffic. Advanced automated systems in t
5、esting use image processing techniques or advanced communication systems in vehicles to communicate with signals and ask for routing. This might not be implementable in developing countries as they prove to be complex and expensive. The concept proposed in this paper involves use of wireless sensor
6、networks to sense presence of traffic near junctions and hence route the traffic based on traffic density in the desired direction. This system does not require any system in vehicles so can be implemented in any traffic system easily. This system uses wireless sensor networks technology to sense ve
7、hicles and a microcontroller based routing algorithm for traffic management. Keywords:Intelligent traffic signals, intelligent routing, smart signals, wireless sensor networks. I. INTRODUCTION The traffic density is escalating at an alarming rate i
8、n developing countries which calls for the need of intelligent traffic signals to replace the conventional manual and timer based systems. Experimental systems in existence involve image processing based density identification for routing of traffic which might be inefficient in situations like fog,
9、 rain or dust. The other conceptual system which is based on interaction of vehicles with traffic signals and each other require hardware modification on each vehicle and cannot be practically implemented in countries like India which have almost 100 million vehicles on road 1. The system prop
10、osed here involves localized traffic routing for each intersection based on wireless sensor networks. The proposed system has a central controller at every junction which receives data from tiny wireless sensor nodes placed on the road. The sensor nodes have sensors that can detect the presence of v
11、ehicle and the transmitter wirelessly transmits the traffic density to the central controller. The controller makes use of the proposed algorithm to find ways to regulate traffic efficiently. II. THE NEED FOR AN ALTERNATE SYSTEM The most prevalent traffic sig
12、naling system in developing countries is the timer based system. This system involves a predefined time setting for each road at an intersection. While this might prove effective for light traffic, heavy traffic requires an adaptive system that will work based on the density of traffic on each road.
13、 The first system proposed for adaptive signaling was based on digital image processing techniques. This system works based on the captured visual input from the roads and processing them to find which road has dense traffic. This system fails during environmental interaction like rain or fog. Also
14、this system in testing does not prove efficient. The advanced system in testing at Pittsburgh 2 involves signals communicating with each other and also with the vehicles. The proposed system does not require a network between signals and vehicles and is a standalone system at each intersection. &nbs
15、p; III. THE PROPOSED SYSTEM This paper presents the concept of intelligent traffic routing using wireless sensor networks. The primary elements of this system are the sensor nodes or motes consisting of sensors and a transmitter. The sensors interact with the physical environment
16、 while the transmitter pages the sensor s data to the central controller. This system involves the 4 x 2 array of sensor nodes in each road. This signifies 4 levels of traffic and 2 lanes in each road. The sensors are ultrasonic or IR based optical sensors which transmits status based on prese
17、nce of vehicle near it. The sensor nodes transmit at specified time intervals via ZigBee protocol to the central controller placed at every intersection. The controller receives the signal and computes which road and which lane has to be given green signal based on the density of traffic. The controller makes use of the discussed algorithm to perform the intelligent traffic routing.
