Improvements in automatic vehicle location systems

Details Improvements in automatic vehicle location systems Improvements in automatic vehicle location systems

G - Physics

08

G

G08G 1/127 (2006.01) G01S 5/00 (2006.01) G08G 1/123 (2006.01)

Patent

CA 2162159

An automatic vehicle location centre comprises a control centre (2) and a plurality of mobile units (12). Each mobile unit is able to derive a current position signal from external radio signals. A prediction (22) is responsive to this current position signal and to predicted motion of the mobile unit to derive a predicted position signal. The predicted and current position signals are compared and the current position signal is transmitted to the control centre in dependence on the result of the comparison. The control centre (2) has a predictor (10), similar to that in each mobile unit, responsive to the current position signal and to predicted motion of the mobile unit to derive a predicted position. This position data is only transmitted from a mobile unit to the control centre if the predicted position signal differs significantly from the actual position.

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