Combined relative and absolute positioning method and apparatus

Details Combined relative and absolute positioning method and apparatus Combined relative and absolute positioning method and apparatus

G - Physics

01

C

G01C 21/30 (2006.01) G01S 5/14 (2006.01) G01S 5/02 (2006.01)

Patent

CA 2116242

A navigation system (1) comprising a rela- tive positioning system (RPS) (2) with dead reckon- ing and map matching and an absolute positioning system (APS) (3) is provided and operated in such a manner that APS position information is used for updating RPS (2) position and contour of equal probability (CEP) information as required. The APS (3) may comprise a Loran-C or a global posi- tioning system (GPS). Different criteria are used for resetting the RPS (2) depending on whether or not the navigation system comprises a Loran-C or a GPS due to the different levels of precision of the Loran-C and the GPS. When the RPS (2) is reset or updated, it is updated to the current APS (3) posi- tion with its offset, if any. Its contour of equal probability (CEP) may also be adjusted.

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