International Journal of Computer Networking, Wireless and Mobile Communications (IJCNWMC) ISSN 2250-1568 Vol. 3, Issue 3, Aug 2013, 117-124 © TJPRC Pvt. Ltd. IMPLEMENTATION OF AN INTEGRATED SYSTEM FOR ACCURATE LOCALIZATION VISHAL S. HINGMIRE 1 & SUNITA S. SHINDE 2 1 E&TC Department, Arvind Gavali College of Engineering, Satara, Maharashtra, India 2 E&TC Department, Annasaheb Dange College of Engineering & Technology, Ashta, Maharashtra, India ABSTRACT Communications between vehicles is possible now days through Vehicular Ad hoc Network (VANET). Contrary to MANET, in VANET nodes which are vehicles can move with high speed and generally must communicate quickly and reliably. Vehicles communicate with each other approximately in the range up to 300 meters and possibly with a roadside infrastructure to provide a long list of applications varying from safety to driver assistance and Internet access. Localization means to estimate a vehicle’s position. Localization is important since many VANET applications especially safety require accurate real time position. Installing a low-cost global positioning system (GPS) or inertial navigation system (INS) unit is becoming a common practice in vehicle applications. But only GPS system is inefficient for Localization. So there is an increased demand for improved variants of GPS system which needs to integrate GPS systems with another system to get more accurate localization for all available conditions on actual road. It is made possible through integrating GPS & RFID. It improves accuracy of the GPS system by employing a DGPS-like concept. It also allows vehicles without GPS to compute their position by contacting GPS equipped neighbors. The performance of the proposed localization system is evaluated via simulation. KEYWORDS: VANET, GPS & RFID, DGPS INTRODUCTION The VANET applications often assume that vehicles real-time position is provided and it should be accurate. Especially safety application requires more accurate localization. GPS receivers have become common in vehicles today. Since in GPS, a mobile unit locates itself by comparing the signal received from four or more GPS satellites. GPS can generate relatively precise position estimates in flat open areas where line-of-sight to multiple satellites is possible [1]. In flat open areas, regular GPS has an average accuracy of approximately 10 meters. Only using GPS it is not possible to get accurate position of vehicle. Some of its improved variants such as differential GPS (DGPS) and assisted GPS (A-GPS) can achieve an average accuracy between 3-7 meters. Also to combat some of the available issues with GPS, some vehicles are equipped with a dead reckonings system, which uses a vehicles velocity, distance and acceleration information to extrapolate the GPS position estimation during short GPS outages. Accurate positioning in VANET, through proposed integrated system makes use of GPS and RFID. Also DGPS to improve GPS accuracy. A GPS vehicle, a vehicle equipped with a GPS system, obtains exact position data from an RFID tag on a roadside unit using an RFID reader while driving. Then, it broadcasts the calculated GPS error value to neighbor vehicles via IEEE 802.11 radio. A non-GPS vehicle, which does not have a GPS system, computes its position using our single peer localization scheme. When the non-GPS vehicle encounters a vehicle having accurate position data, they exchange position and travel information via RFID and 802.11 radios, respectively. At the end of this process, the non- GPS vehicle can estimate its accurate position from the received data. Proposed system is designed for accurate localization that does not use signal strength or propagation properties. Moreover, a non-GPS vehicle is able to estimate its