Method for clock calibration in a position determination system

Details Method for clock calibration in a position determination system Method for clock calibration in a position determination system

G - Physics

01

S

G01S 1/04 (2006.01) G01S 1/20 (2006.01) G01S 3/02 (2006.01) G04G 7/02 (2006.01) G01S 1/02 (2006.01)

Patent

CA 2141233

Timing signals are transmitted from reference transmitters through antenna/receivers (antenna preamplifier nodes) to collector nodes (C-Nodes) and to a central computer. The times of arrival of the signals at the various C-Nodes are measured by the C-Nodes, relative to each C-Node's clock. The time of arrival signals at each C- Node must be based upon a common time reference to be useful for positioning. Therefore, the central computer determines the offsets of clocks relative to a selected reference C-Node clock. The time of arrival signals are then calibrated against one another and used to adjust the time of arrival signals so that all time-of-arrivals are relative to the same reference and can be used for position determination and the clocks of the collection nodes are effectively synchronized.

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