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Wireless position is one of the most important research fields in VANET application. It has certain technical restrictions to realize the accurate position between vehicle using wireless communication network., but it can realize approximate position between vehicles in local area, and can satisfy the requirement of vehicle active safe technologies such as collision warning for location precision...
Vehicular networks are emerging as a new distributed system environment with myriad possible applications. Most studies on vehicular networks are carried out via simulation, given the logistical and economical problems with large-scale deployments. This paper investigates the impact of realistic radio propagation settings on the evaluation of VANET-based systems. Using a set of instrumented cars,...
Wireless mesh networks (WMN) are poised to be a cost-effective platform for many municipal applications in public safety, business and entertainment. In this paper we study WMN-based content delivery within Intelligent Transportation Systems (ITS) applications. An example ITS application would be to deliver content used for vehicle route guidance in emergency evacuation situations. We study and present...
Vehicle collisions at intersections account for a large percentage of overall traffic accidents, a good portion of which are fatal. A large number of these accidents can be avoided by a warning system which makes a driver aware of potential collisions on the road, thus allowing the driver enough time to prevent such situations. This paper presents the design of a prototype intersection collision warning...
This paper presents the results of wideband channel measurement campaigns conducted in vehicle environment. A frequency range of 0.5 - 16 GHz was measured using a vector network analyzer. Typical in-vehicle scenarios, including line-of-sight (LOS), non-line-of-sight (NLOS), different distance, impact of passengers, were considered. The objective of this work is to obtain a better assessment of the...
The autonomous smart car is the foundation of physical simulation of vehicle platoon based on vehicle and road cooperation. This paper analyzed the architecture of vehicle platoon system in the case of vehicle-road cooperation, and proposed the constitution and structure of autonomous smart car control system.After analyzing functional requirement of the autonomous smart car, the paper designed the...
We present a method for accurate aggregation of highway traffic information in vehicular ad hoc networks (VANETs). Highway congestion notification applications need to disseminate information about traffic conditions to distant vehicles. In dense traffic, aggregation is needed to allow a single frame to carry information about a large number of vehicles. Our technique, CASCADE, uses compression to...
This paper presents the development of a wireless stereo vision system for a small rotary-wing unmanned aerial vehicle. A vision sensor enhances the navigation and guidance performance of the flight vehicle. A wireless stereo vision system was developed to minimize the size and weight of the payload. A ground image processing system was built to provide the position and distance to the targets such...
Emergency message propagated in vehicular networks is delay intolerance and crucial for safety management. While the non-real-time traffic can highly improves the quality and comfortable of everyday. However, due to the limited transmission coverage and the poor quality of time-varying wireless environment, the two type traffic need relay to assist in the completion of communication. So this paper...
We study the connectivity in vehicular ad-hoc networks, where the motion of vehicles is constrained on a lattice-shaped road network. First, we theoretically investigate the connectivity under the Poisson-positioning assumption, where vehicles are positioned according to a Poisson process on each road at any arbitrary instants. We find that the Poisson-positioning assumption allows the existence of...
Cooperative systems based on V2X wireless communications offer promising opportunities for automotive safety and traffic efficiency improvement. Under preventive safety, cooperative assistance systems increase in-vehicle integrated safety systems functionality, enlarging driver's time-space perception as well as the quality and reliability of the environment data, and therefore enhancing his response...
Time and location data play a very significant role in a variety of factory automation scenarios, such as automated vehicles and robots, their navigation, tracking, and monitoring, to services of optimization and security. Pervasive wireless capabilities combined with time and location information are enabling new applications in areas such as transportation systems, health care, elder care, military,...
The use of wireless network signal strength proposed to estimate the relative position between vehicles in a robot formation set. We propose a relative leader-follower model which allows us to use the reception signal strength as control variable for robot stabilization in the formation. Vehicle sensors consist of wheel speed and steering angle, the WiFi data consist of reception signal strength (RSS)...
This paper designs a connectivity analysis scheme for the roadside-to-vehicle telematics network based on the real movement history of vehicle objects collected from taxi telematics system currently in operation, aiming at providing a useful guideline and information to build a telematics network.The implemented analyzer can locate the current and previous positions of all vehicles, decide whether...
The objective of this invited talk is to present selected visions of ubiquitous computing and ambient communication based on the notion of the disappearing computer and to reflect on the resulting challenges for designing experiences in future smart environments. Our approach places the human at the centre of our design considerations and is based on exploiting the affordances of real objects by augmenting...
Due to the advent of many location based applications, mobile localization in outdoor environments has recently attracted much attention. Many existing localization solutions rely primarily on a hybrid wireless network/dead reckoning (DR) method, as the regular wireless network can hardly estimate a location with satisfactory accuracy in bad channel conditions. However, the DR scheme can involve considerable...
Recent advances in wireless communications and micro-electro-mechanical systems have fostered the development of wireless sensor networks (WSNs) which consist of tiny, low-cost and low-power sensor nodes. Individual sensor nodes only have local views of the environment, but global views can be obtained by collaborative processing between densely deployed sensor nodes. Energy efficiency is critical...
In this paper we present empirical results from a study, examining the effects of environmental diversity on vehicle-to-vehicle link in vehicular ad hoc networks (VANET). And packet loss rate (PLR) and received signal strength indicator (RSSI) of the wireless link are measured. The results of the measurement indicate that environment affects the quality of the wireless link in VANET greatly; the average...
In this document, we verified the application by implementing the unmanned operation of system using the development of TOA application method. Applying wireless technology of sub equipment in signal system related to the safety operation is limited due to the difficulty of confirming the Fail-safe. However, we confirmed that it would be economical of the cost which could be required to maintain the...
In this paper a multi sensor system for so called vulnerable road user recognition is presented, developed within an EU project for road safety improvement. The data fusion concept rests upon the sensors near infrared camera and wireless ranging devices, which are complemetary concerning their physical properties. By means of an object oriented approach using the Kalman Filter the introduced concept...
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