Intelligent Transportation Systems

In this report, a hybrid observer is proposed as a method of estimating position and velocity of a vehicle when the primary output is a series of discrete magnetic markers placed along a roadway. For the preliminary studies, the vehicle was modeled as a pure inertial system with acceleration input. Two methods of determining the time "tk" at which the "k-th" marker is passed are discussed, and simulations using both methods are shown. Compensation for errors arising due to inaccurate measurement of this time is proposed and validated. A Proportional- Integral-Derivative (PID) controller...

This report presents the findings of a study of commercial motor vehicle inspection and screening station practices with a focus on the use of various technologies to help address problems related to safety, security, roadway infrastructure, and air quality. A review of industry literature identified the various types of inspection and screening practices that have been and are being implemented including weight and size management, on-board equipment checking, driver-related violations and cargo monitoring, credential checking, and exhaust emissions monitoring. The review also identified...

Mobile radio communications systems are attracting more and more attention since they provide a means for users on the move to exchange information with other stationary or mobile stations. The capability of communication on the move can support many services and create lots of applications. For example, in the future Intelligent Vehicles Highway Systems (NHS), mobile communication technologies have enabled two important subsystems, namely Advanced Traffic Management and Information Systems (ATMIS) and Automatic Vehicular Control Systems (AVCS). The purpose of this research is to develop a...

We examine the feasibility of designing an accelerometer-based (or gyroscope-free) inertial navigation system that uses only accelerome-ters to compute the linear and angular motions of a rigid body. The accelerometer output equation is derived to relate the linear and an-gular motions of a rigid body relative to a fixed inertial frame. A suf-ficient condition is given to determine if a configuration of accelerom-eters is feasible. If the condition is satisfied, the angular and linear motions can be computed separately using two decoupled equations of an input-output dynamical system; a...