DEAD-RECKONING GUIDANCE SYSTEM AND METHOD WITH CARDINAL-DIRECTION BASED COORDINATE-CORRECTIONS

摘要

A dead-reckoning guidance system (10) determines a vehicle-speed (22) of the host-vehicle (12) based on wheel-signals (20) from the one or more wheel-sensors (18); determines a distance-traveled (24) by the host-vehicle (12) during a time-interval (36) since prior-coordinates (38) of the host-vehicle (12) were determined; determines a heading-traveled (48) of the host-vehicle (12) during the time-interval (36) since the prior-coordinates (38) of the host-vehicle (12) were determined; determines present-coordinates (40) of the host-vehicle (12) based on the distance-traveled (24) and the heading-traveled (48); determines when the vehicle-speed (22) is greater than a speed-threshold (52); determines when the heading-traveled (48) differs from a cardinal-direction (46) by both greater than a noise-threshold (54) and less than an angle-threshold (56); and in response to a determination that both the vehicle-speed (22) is greater than the speed-threshold (52) and that the heading-traveled (48) differs from the cardinal-direction (46) by both greater than the noise-threshold (54) and less than the angle-threshold (56), determines a coordinate-correction (42) to apply to the present-coordinates (40), said coordinate-correction (42) determined in accordance with the distance-traveled (24) and the cardinal-direction (46).