METHOD AND APPARATUS FOR MEASURING RELATIVE HEADING CHANGES IN A VEHICULAR ONBOARD NAVIGATION SYSTEM

摘要

A METHOD AND APPARATUS FOR MEASURING RELATIVE HEADING CHANGES IN A VEHICULAR ONBOARD NAVIGATION SYSTEM A method and apparatus for measuring relative heading changes in a vehicular onboard navigation system is provided comprising apparatus for providing signals corresponding to differential wheel distance measurements, the velocity and wheel tracking distance of the vehicle. When front wheel distance measurements are used in a vehicle having an Ackerman-type steering system, an apparatus for providing a signal corresponding to an effective front wheel tracking distance as a function of the curvature of turn is also provided.