Multipath tolerant location system and method therefor

Details Multipath tolerant location system and method therefor Multipath tolerant location system and method therefor

G - Physics

01

S

G01S 5/06 (2006.01) G01S 1/00 (2006.01) G01S 1/04 (2006.01) G01S 5/14 (2006.01)

Patent

CA 2141223

A multilateration location system (12) includes a locatable unit (16) and any number of known-position locators (14). A time of arrival detector (22) determines instants in time when a location signal (20) transmitted by the locatable unit (16) arrives at various known-position locators (14). For each combination of two known-position locators (14) that receive the location signal (20), a pre-estimation process (32) determines whether the difference in arrival times is less than or equal to a maximum propagation duration for the locator pair. The maximum propagation duration is based upon the distance between the locators (14) in the locator pair. If the difference is greater than the maximum propagation duration, the difference is omitted from the data set processed by a multilateration calculation process (34). A post estimation filtering process (36) screens out location estimates that are too distant from a predicted position.

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