FIELD: navigation systems.
SUBSTANCE: invention relates to location estimation. At first, a data structure is provided that includes an error radius mapped to a scaled geographic area or “tile” that includes the area in which a calculated position can be determined. Said data structure may include a plurality of first fields identifying the scaled geographic area based on a global projection reference system, and a plurality of second fields identifying for each of the first fields a position error radius associated with the scaled geographic area and level. For any calculation of an inferred position based on beacon observations, a rapid lookup of the corresponding scaled area including the new inferred position in the data structure returns an error radius for the new inferred position.
EFFECT: determination of an error radius, which reflects the accuracy of the predicted (or calculated) position of the processing device.
9 cl, 14 dwg
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