Vehicle navigation system

Details Vehicle navigation system Vehicle navigation system

G - Physics

01

S

343/81

G01S 11/04 (2006.01) G06F 15/50 (1990.01)

Patent

CA 1296412

VEHICLE NAVIGATION SYSTEM ABSTRACT OF THE DISCLOSURE A vehicle navigation system is provided wherein a preselected route is established in terms of a sequence data and processing means computes sequence action data based on lineal distances between landmarks, such as junctions, and movement detective means, such as a turn detection, for detecting movement only around an approached landmark in order to synchronize position with the landmark. In accordance with the invention, it is unnecessary to store all geographic data about a region to be traversed during a journey and further computation can be extremely efficient without reliance at any time or detection of direction with respect to magnetic north or other fixed, remote reference. All needed information is incorporated into data related only to distance travelled by the vehicle between landmarks and movement around (e.g., turns) an approached landmark. The system works on the assumption that the vehicle moves in one dimension between predetermined landmarks so that route information can be reduced to a sequence of indicators. The movements around landmarks, or more specifically junction or turns where deviations are expected from a straight line constant velocity path are used to synchronize vehicle location relative to the landmark. The accuracy of map distance between landmarks is assumed within an acceptable error so that synchronization can be obtained within a window distance during which the system seeks synchronization.

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