Showing papers on "Vehicular communication systems published in 1995"

Vehicle-to-vehicle communication for collision avoidance and improved traffic flow

Abstract: The purpose of this Innovations Deserving Exploratory Analysis (IDEA) project was to determine the performance requirements of a vehicle-to-vehicle communication and on-board processing system which would provide prediction and driver warning of potential inter-vehicular collisions, thus improving collision avoidance. The approach taken was unique in that the warning system developed allows vehicles to operate independently and without the control problems associated with platooning, but with the ability to utilize data from several vehicles ahead, unlike two-vehicle interaction systems. The impact of the developed advisory system is potentially large, since some 20% of all accidents are of the rear-end collision type and such accidents result in substantial loss of life and substantial cost in the form of delay and property loss. Researchers have stated that 60% of all rear-end collisions could be avoided if the driver were given an additional one-half second of warning prior to an incident.

Intelligent transportation systems

Abstract: Summary form only given. Intelligent Transportation Systems (ITS) represent an expanding international market. "Intelligent" is synonymous with the application of technology to the movement of goods and people. The largest potential market is services and products which includes systems for passenger vehicles. In the year 2000 and beyond, electronic systems will be integral to the operation, safety and control of the vehicle including collision warning and avoidance, emergency communications, vision enhancement, etc. Eventually, many driving functions will be "automated"-the extent of automation will be determined by user acceptance including cost. The vehicle market will be a significant user of monolithic circuits. Preliminary data is presented on the market categories and potential volume. The presentation places emphasis on showing illustrative examples of ITS system deployment and market projections. >

Analysis of communication requirements for intelligent transportation systems: methodology and examples

Abstract: The intelligent transportation system (ITS) utilizes technological advances in computers, electronics, and communications in order to improve the effectiveness of the entire surface transportation system. The communication system which connects all of the ITS components has to be adequate in addressing the user requirements. The definition and analysis of the ITS communication system is essential to demonstrate the ability of an ITS architecture in providing all of the intended user services. In this paper, we define the subsystems of an ITS physical architecture and perform data loading analysis on the RF communication link between the vehicles and the infrastructure.

Intelligent &-Optimal Path Prediction for Vehicular Travel

Abstract: This paper addresses the problem of predicting the path of a vehicle performing a transit mission. Such a mission proceeds from a start location to a goal location guided by an intelligent planning strategy. Given the history of a path from a start location to a current location, the objectives are: 1) to estimate the cost criterion guiding the travel; 2) to predict the goal location; and 3) to predict the future path leading to the predicted goal location. First, a cost criterion explaining the decision-making strategy of the observed vehicle is estimated using a correlation measure comparing the observed path data to optimal path search information. This correlation is expressed in terms of the tolerance /spl epsiv/ of an /spl epsiv/-optimal path. Next, a region of plausible goal locations is predicted assuming that the vehicle will proceed using either optimal decisions or /spl epsiv/-optimal decisions in the future. The predicted goal location of the vehicle is determined by selecting the point in the region of plausible goal locations that has the highest heuristic merit, as determined by a proposed ranking system. Finally, from auxiliary search information, the future path is predicted. This problem is generalized to predicting the future path of a point vehicle traveling in an arbitrary dimensional space. >

Ultra-wideband technology for vehicle-to-vehicle communication and sensing

Abstract: Ultra-wideband (UWB) communications is a new field of technology that has a wide range of applications from range finding to wide bandwidth communications. Ultra-wideband signals are unusual because their bandwidth to center frequency ratio is not small and can be greater than 100%. Recent developments of integrating this technology on a chip have made it versatile and low cost. This technology also offers some special features like interference immunity, multi-access communications, and accurate range finding. A number of areas which need cooperative communications can benefit from this technology including automated highway systems (AHS) and military systems. This paper describes the basics of UWB technology, provides background on the technology, and provides some possible applications of UWB.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.