Communications in Intelligent Vehicle Highway Systems--Part II. Interim Report (original) (raw)

Communications in Intelligent Vehicle Highway Systems--Part II. Interim Report

This report is a theoretical analysis of several communications techniques that will be useful in the full implementation of IVHS technologies. The report is a continuation of the work completed in Part I. It looks at some of the communications problems that have been mentioned as bringing some difficulties to spread spectrum, such as the near-far problem. The report also investigates the simulation protocol that could be used with spread spectrum radio to allow for individualized messages to be sent from traffic management centers to vehicles. The use of infrared as a multi-access communications technique is also investigated. Infrared was chosen since it is the system that is used by Semens in their Lisb and Autoguide systems of vehicle navigation. The third chapter discusses a totally different type of communications. This chapter looks at using radio frequency transponders on vehicles to determine the exact lateral and headway between vehicles. The Path program in California is ...