Patent ID: 6182005
Filing Date: 2001-01-30
Classification: G01C,G01S,G08G

Abstract:
A GNSS compatible method for guidance using a GNSS receiver, a computer with display located in at least one vehicle, the vehicle selected from the group comprising aircraft and surface vehicles, said method comprising the steps of:(a) adopting a coordinate system being Earth Centered Earth Fixed for computation using said computer;(b) establishing waypoints in said coordinate system;(c) determining the previous and next waypoints;(d) determining a position of said at least one vehicle, in said coordinate system using said GNSS receiver;(e) determining a true course line between said previous and next waypoints, where said previous waypoint is selected from the group comprising waypoint and said position;(f) computing a cross track vector between said position and said true course line;(g) computing a vertical unit vector at said position;(h) computing a vertical deviation from said true course line, by projecting said cross track vector onto said vertical unit vector;(i) computing a lateral unit vector at said position;(j) computing a lateral deviation from said true course line by projecting said cross track vector onto said lateral unit vector;(k) establishing a X-Y display, comprising a X display axis, representative of the lateral direction and used to indicate said lateral deviation, and a Y display axis, representative of the vertical direction and used to indicate said vertical deviation;(l) defining a display axis intersection point for said X display axis and said Y display axis where said intersection point is selected from the group comprising a point representative of said position and a point representative of said true course line and;(m) displaying on said X, Y display a symbol at an X-Y display location representing said lateral deviation and said vertical deviation from said true course line, thereby providing a visual representation of said lateral deviation and said vertical deviation from said true course line, thus providing visual guidance to follow said true course line.