Patent ID: 6202027
Filing Date: 2001-03-13
Classification: G01S

Abstract:
A bias calibration method for a host vehicle system that predicts a travel path of the host vehicle based on vehicle velocity and curve data obtained from a curve sensor subject to bias, the host vehicle including a forward looking sensor that measures range and azimuth angle data of a target forward of the host vehicle, the method comprising the steps of:receiving a set of range and azimuth angle data for each of a plurality of successive segments of travel of the host vehicle, and for each received set of range and azimuth angle data:computing a lateral distance between the host vehicle and the target based on such range and azimuth angle data and said predicted travel path; anddetermining a location point of the target in terms of its measured range and the computed lateral distance;processing the determined location points to characterize the calculated lateral distance as a second order function of the measured range, such second order function having a second order coefficient related to a bias of said curve sensor;determining the bias of said curve sensor from said second order coefficient; andadjusting the curve data obtained from said curve sensor based on the determined bias of said curve sensor.