Using statistical analysis to infer an accurate GPS location for use in tracking devices

摘要

A system method for improving the accuracy of a tracking device is described where the tracking device cannot achieve an accurate GPS fix due to low observability. The system and method improves accuracy determining a current position for the tracking device using incomplete information from the GPS. The current position is added to a historical table of previous position determinations and a normalized center position is calculated from the current position and previous position determinations. The position of the tracking device is inferred from the normalized center position.

主权项

1. A method for improving the accuracy of a tracking device where the tracking device cannot achieve a complete fix using a location determination mechanism, the method comprising:
determining a current position for the tracking device using incomplete information from the location determination mechanism; adding the current position to a historical table of previous position determinations; calculating a normalized center position from the current position and previous position determinations; inferring the position of the tracking device from the normalized center position; detecting the movement of the tracking device using an inertia sensor; and clearing the historical table of previous positions in response to the detection of movement.