Intelligent Transportation Systems

Integration of GPS-aided INS into AVCSS

Farrell, Jay
Barth, Matthew
2000

This report describes the results of an effort to implement and analyze the performance a vehicle control system using control state information obtained from a carrier phase Differential Global Positioning System (DGPS) aided Inertial Navigation System (INS). Keywords: Vehicle Positioning Systems, Global Positioning System, Inertial Navigation, Differential Carrier Phase, Advanced Vehicle Control

Evaluation Of ITS Technology For Bus Timed Transfers

Hall, Randolph
Dessouky, Maged
Nowroozi, Ali
Singh, A.
1997

This paper evaluates dispatching rules at timed transfer transit terminals. The evaluation focuses on total passenger delay and the number of passengers missing their connections. Analytical and simulation models are developed to evaluate the benefit of Intelligent Transportation Systems (ITS) applications. The authors conclude that the benefit of ITS for timed transfer alone does not justify the implementation of Global Positioning Systems (GPS) for bus tracking technology.

Tools for Operations Planning (TOPL2)

Varaiya, Pravin
2009

TOPL is a suite of tools to specify operational improvements including ramp metering, incident and demand management, auxiliary lanes, traveler information, and to quickly estimate the benefits that such improvements can realize. TOPL is based on the macroscopic cell transmission model (CTM). Advances under TOPL2 can be classified under (1) theory, (2) software and algorithms, and (3) applications.In terms of theory, the CTM model for a freeway was thoroughly analyzed and extended to arterials. In software, the major advance was the development of Aurora—an object-oriented simulation...

Vehicle To Roadside Communications Study

Polydoros, Andreas
Dessouky, Khaled
Pereira, Jorge M. N.
Sun, Chung-ming
Lee, Kuo-chun
Papavassiliou, Thomas D.
Li, Victor O. K.
1993

The objective of this study is to address the communication system design issues of Intelligent Vehicle Highway Systems (IVHS). The focus of Phase I of this research is the design for California Advanced Driver Information Systems (CADIS). The emphasis is on the architecture and topology aspects of the physical link and access layers connecting the moving layers with the fixed infrastructure. The work is divided into the following categories: Automatic Vehicle Identification (AVI), IVHS communications survey and functional requirements, modeling of IVHS fading channels, multiple-access...

A System Review of Magnetic Sensing System for Ground Vehicle Control and Guidance

Chan, Ching-yao
2002

This report contains research results of studies on magnetic marker systems that are used as a posi-tionreference system for Advanced Vehicle Control and Safety Systems. Effects of external objectsand earth background fields on such systems are investigated with experimental measurements inPart I. The results show that signal processing techniques must be adopted in field applications toimprove the accuracy and robustness of sensing algorithms. Part II of the report contains experimen-talresults from an evaluation study of PATH marker system and 3M Tape system. The objective isto identify...

Experimental Results Of Fuzzy Logic Control For Lateral Vehicle Guidance

Hessburg, Thomas
Peng, Hei
Zhang, Wei-bin
Arai, Alan
Tomizuka, Masayoshi
1994

A Fuzzy logic controller (FLC) is designed and implemented in real time on a Toyota Celica test vehicle to achieve control of the lateral motion of the vehicle. The structure of the FLC is modularized as a feedback, preview, and gain scheduling rule base. The parameters of the FLC are tuned manually using information from characteristics of human driving operation and an existing controller. The fuzzy logic control strategies are implemented on the test vehicle, automatically following a multiple curved track using discrete magnetic markers as a lateral error reference system. The test...

Field Investigation of Advanced Vehicle Reidentification Techniques and Detector Technologies - Phase 1

Ritchie, Stephen G.
Park, Seri
Oh, Cheol
Sun, Carlos
2002

This report presents the results of Phase I of a multi-year research effort on "Field Investigation of Advanced Vehicle Reidentification Techniques and Detector Technologies," and extends previous PATH research by the authors on MOU 336 "Section-Related Measures of Traffic System Performance: Prototype Field Implementation." The focus of this research included the following: significant expansion and enhancement of the ILD-based vehicle reidentification system at a major signalized intersection in Irvine, California to address reidentification of turning vehicles in addition to through...

Deployment Path Analysis for Cooperative ITS Systems

Shladover, Steven E.
2009

Although the performance advantages of cooperative ITS systems are generally appreciated, the deployment challenges that they pose represent a significant impediment. This report begins with a summary of the types of deployment challenges faced by cooperative information systems and cooperative vehicle-highway automation systems (CVHAS), both of which require coordination of deployment of vehicle and infrastructure-based elements. The institutional challenges are discussed first, followed by the technological challenges. In each case, current progress in overcoming these challenges is...

Methods Of Analysis Of IVHS Safety

Hitchcock, Anthony
1992

This is the final and primary report of a PATH project which focused on developing and demonstrating methods by which the safety of Intelligent Vehicle Highway Systems (IVHS) can be assured, assessed and evaluated. Safety considerations were studied for automated freeways, driver aids, and copilots.

Vehicle-based Control Computer Systems

Auslander, David M
1995

This report is presented in two parts: the first part describes a design and implementation methodology for real time software suitable for control of mechanical systems such as vehicles. This method provides for a design description of the system, a means of capturing the system structure in such a way as to modularize the software writing job, and a portable implementation method. The second part is concerned with a particular problem in the mechanical system control: estimating velocity when the even rate from a digital encoder is lower than the controller's sample time. Methods are...