Combined relative and absolute positioning method and apparatus
First Claim
1. A method of operating a navigation system comprising a relative positioning system (RPS), said RPS including means for dead reckoning with map matching, and an absolute positioning system (APS) comprising the steps of:
- a. acquiring current RPS position information, including information on the validity of the RPS position information, from the RPS;
b. acquiring current APS position information, including information on the validity of the APS position information, from the APS;
c. evaluating the RPS and the APS position information acquired in said steps (a) and (b);
d. updating the RPS position information such that the updated RPS position information is based on the then current APS position information without regard to the then current RPS position information if required by the results of said step (c); and
e. repeating said steps (a) through (d).
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Accused Products
Abstract
A navigation system comprising a relative positioning system (RPS) with dead reckoning and map matching and an absolute positioning system (APS) is provided and operated in such a manner that APS position information is used for updating RPS position and contour of equal probability (CEP) information as required. The APS may comprise a Loran-C or a global positioning system (GPS). Different criteria are used for resetting the RPS 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 is reset or updated, it is updated to the current APS position with its offset, if any. Its contour of equal probability (CEP) may also be adjusted.
329 Citations
57 Claims
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1. A method of operating a navigation system comprising a relative positioning system (RPS), said RPS including means for dead reckoning with map matching, and an absolute positioning system (APS) comprising the steps of:
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a. acquiring current RPS position information, including information on the validity of the RPS position information, from the RPS; b. acquiring current APS position information, including information on the validity of the APS position information, from the APS; c. evaluating the RPS and the APS position information acquired in said steps (a) and (b); d. updating the RPS position information such that the updated RPS position information is based on the then current APS position information without regard to the then current RPS position information if required by the results of said step (c); and e. repeating said steps (a) through (d). - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 17, 18, 19, 20, 21, 22, 23, 31, 32, 33, 34, 35, 36, 37)
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2. A method of operating a navigation system comprising a relative positioning system (RPS), said RPS including means for dead reckoning with map matching, and an absolute positioning system (APS) comprising the steps of:
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a. acquiring current RPS position information, including information on the positional uncertainty of the RPS position information, from the RPS; b. acquiring current APS position information, including information on the positional uncertainty of the APS position information, from the APS; c. evaluating the RPS and the APS position information acquired in said steps (a) and (b); d. updating the RPS position information such that the updated RPS position information is based on the then current APS position information without regard to the then current RPS position information if required by the results of said step (c); and e. repeating said steps (a) through (d).
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11. A method of operating a navigation system comprising a relative positioning system (RPS), said RPS including means for dead reckoning with map matching, and a Loran-C comprising the steps of:
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a. acquiring current RPS position information, including information on the validity of the RPS position information, from the RPS; b. acquiring current Loran-C position information, including information on the validity of the Loran-C position information, from the Loran-C; c. evaluating the RPS and the Loran-C position information acquired in said steps (a) and (b); d. updating the RPS position information such that the updated RPS position information is based on the then current Loran-C position information without regard to the then current RPS position information if required by the results of said step (c); and e. repeating said steps (a) through (d). - View Dependent Claims (13, 14, 15, 16)
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12. A method of operating a navigation system comprising a relative positioning system (RPS), said RPS including means for dead reckoning with map matching, and a Loran-C comprising the steps of:
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a. acquiring current RPS position information, including information on the positional uncertainty of the RPS position information, from the RPS; b. acquiring current Loran-C position information, including information on the positional uncertainty of the Loran-C position information, from the Loran-C; c. evaluating the RPS and the Loran-C position information acquired in said steps (a) and (b); d. updating the RPS position information such that the updated RPS position information is based on the then current Loran-C position information without regard to the then current RPS position information if required by the results of said step (c); and e. repeating said steps (a) through (d).
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24. A method of operating a navigation system comprising a relative positioning system (RPS), said RPS including means for dead reckoning with map matching, and a Global Position System (GPS) comprising the steps of:
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a. acquiring current RPS position information, including information on the validity of the RPS position information, from the RPS; b. acquiring current GPS position information, including information on the validity of the GPS position information, from the GPS; c. evaluating the RPS and the GPS position information acquired in said steps (a) and (b); d. updating the RPS position information such that the updated RPS position information is based on the then current GPS position information without regard to the then current RPS position information if required by the results of said step (c); and e. repeating said steps (a) through (d). - View Dependent Claims (26, 28, 29, 30)
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25. A method of operating a navigation system comprising a relative positioning system (RPS), said RPS including means for dead reckoning with map matching, and a Global Positioning System (GPS) comprising the steps of:
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a. acquiring current RPS position information, including information on the positional uncertainty of the RPS position information, from the RPS; b. acquiring current GPS position information, including information on the positional uncertainty of the GPS position information, from the GPS; c. evaluating the RPS and the GPS position information acquired in said steps (a) and (b); d. updating the RPS position information such that the updated RPS position information is based on the then current GPS position information without regard to the then current RPS position information if required by the results of said step (c); and e. repeating said steps (a) through (d). - View Dependent Claims (27)
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38. A navigation system comprising a relative positioning system (RPS), said RPS including means for dead reckoning with map matching, and an absolute positioning system (APS) comprising:
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means for acquiring current RPS position information, including information on the validity of the RPS position information, from the RPS; means for acquiring current APS position information, including information on the validity of the APS position information, from the APS; means for evaluating said RPS and said APS position information; and means for updating the RPS position information such that the updated RPS position information is based on the then current APS position information without regard to the then current RPS position information if required by said evaluating means. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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Specification