公开(公告)号：WO2019094564A1

公开(公告)日：2019-05-16

申请号：PCT/US2018/059787

申请日：2018-11-08

Applicant: WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION

Inventor： LANGSTRAAT, Brian, James ,  VANDEVENTER, Craig, Willard ,  SWIDERSKI, Frank, J. ,  SMITH, Keith, Edward

IPC: G01C17/38 ,  G01C17/02 ,  G01C25/00 ,  G01R33/02

Abstract: A system for calibrating a subsystem configured to determine a heading of a vehicle includes (1) a navigation system providing reverser control data, GPS data, and magnetometer data; and (2) an onboard computer configured to calculate X and Z average magnetic fields and derive an X- and Z-axes partial ellipse therefrom; calculate semi-major axis or semi-minor axis values corresponding to respective points on the partial ellipse; perform a position translation of the partial ellipse along the X- and Z-axes; perform a magnitude scaling of the partial ellipse along the X- and Z-axes, wherein the position translation and magnitude scaling yield transformed X and Z magnetic field values; and calculate a heading based on the position translated and magnitude scaled partial ellipse.