Showing papers on "Vehicular communication systems published in 1998"

Machine-vision systems for intelligent transportation systems

Abstract: ITS can use machine vision to detect lane markings, vehicles, pedestrians, road signs, traffic conditions, traffic incidents, and even driver drowsiness. Challenges include making machine-vision systems less expensive, more compact, and more robust in various weather and traffic conditions.

Dedicated short range communication system and network architecture for intelligent transportation systems

Abstract: Recent advances in the area of Digital Signal Processing chips, signal processing algorithms, and network architectures have allowed the introduction of new methods for implementing components of the Intelligent Transportation System (ITS). In terms of the network architecture, the mobility management function is an important consideration in the network design and operation. A Dedicated Short Range Communications (DSRC) link, together with some of the design aspects of the network architecture and communication interfaces, effectively meet the requirements of the ITS architecture. The DSRC link is an effective one-way and two-way communications link between the vehicle and the roadside.

Evaluations of traffic safety improvement using an autonomous traffic flow simulator including inter-vehicle communications

Abstract: In ITS (intelligent transport systems), it is very important to evaluate the effectiveness of inter-vehicle communication systems Unfortunately, few studies on traffic flow simulators that can evaluate the effectiveness of inter-vehicle communication systems for improving the traffic safety have been reported In this paper, we evaluate the effectiveness of inter-vehicle communication systems using the traffic flow simulator including inter-vehicle communications developed by the authors Simulation results show that the inter-vehicle communication system is effective in improving the traffic safety

An autonomous traffic flow simulator including inter-vehicle communications

Abstract: How to evaluate the effectiveness of communication systems in ITS is very important. In this paper, an autonomous traffic flow simulator is constructed, including inter-vehicle communication systems that can evaluate the effectiveness of inter-vehicle communication systems in the ITS using an object-oriented method. In this simulator, the inter-vehicle communication systems perform as a vehicular driving assistant system. Simulation results show that the inter-vehicle communication system is effective for improving the traffic safety. In addition, this simulator can evaluate the traffic safety depending on the mounting ratio of communication equipment. For the covering abstract see IRRD E102946.

Intermodal Transportation Operation System (ITOS) for the State of California

Abstract: Intermodal transportation entails the coordinated movement of different types of transportation (rail, truck, automobile, etc.) to serve the needs of travelers and shippers. The purpose of this report is to provide a vision for systems to coordinate intermodal operations in California in the future, and also to document the types of systems that are being used today in a range of transportation modes. An intermodal system could, conceivably, establish a center (or centers) that is responsible for the joint operation of multiple modes of transportation. This is not our preferred vision. Instead, we envision that these systems will retain their current organizational and modal identifies in the future. However, systems will be developed to provide interconnections when benefits are significant. Keywords: Transportation Management Centers, Intermodal Transportation, System Architecture, Transportation Systems Management

Vehicle-to-vehicle communication system and on-vehicle communication equipment therefor

Abstract: PROBLEM TO BE SOLVED: To enable vehicle-to-vehicle communication without mutual interference with road-to-vehicle communication by transmitting/receiving a data packet shorter than a slot length determined by a road-to-vehicle communication system during the period of a frame control slot while synchronizing it with a communication frame inside an area by using a frequency channel for up communication. SOLUTION: Up channel modulating and demodulating parts 304 and 305 and a vehicle-to-vehicle communication control part 307 transmit/receive the data packet shorter than the slot length determined by the road-to-vehicle communication system while using the frequency channel for up communication. Inside the area of road-to-vehicle communication, a road-to-vehicle communication control part 306 transmits the data packet during the frame control slot period synchronously with a communication frame from the information of detecting the communication frame. The road-to-vehicle communication system does not use the frequency channel for up communication during the frame control slot period. Inside the area of road-to-vehicle communication, vehicle-to- vehicle communication is enabled without disturbing the road-to-vehicle communication.

Its standards in the context of transportation and telecommunication infrastructure

Abstract: A case study on the emerging Intelligent Transportation Systems (ITS) industry, with focus on communications, is presented in this paper. The author examines the complexity of the standardization process as it relates to modern and interdependent technologies.