Patent US7592952B2 successfully refreshed from Google Patents.
US7592952B2
Active / In Force
US
⏱️ 0.9 years remaining
Method of locating a vehicle from satellite data
Assignee: Safran Electronics and Defense SAS
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Filing: 2007-10-05
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Granted: 2009-09-22
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Expires: 2027-10-05
Abstract
Abstract A method of locating a moving element by determining a reference position and at least one overall protection limit on the basis of data from a group of satellites in a constellation of satellites. The method comprises the steps of selecting from the group of satellites a subgroup comprising at least five satellites, calculating positions from the data from the group and from the data from the subgroup, and calculating corresponding protection limits while distinguishing whether the failure in the constellation does or does not affect the satellites under consideration.
Inventors
- 👤 Charlie Vacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:56
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/13; G01S19/20; G01S19/14; G01S19/15
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
176 words
A method of locating a moving element by determining a reference position and at least one overall protection limit from data from a group of satellites in a constellation of satellites, the overall protection limit calculation comprising the step of calculating protection limits as a function of probabilities for the absence of failure in the constellation of satellites, and of failure in the constellation of satellites, the method comprising the steps of: from the group of satellites, selecting a subgroup comprising at least five satellites; calculating a main position from the data from a group of satellites; calculating secondary positions from the data from a subgroup of satellites by excluding date from one of the satellites when calculating each secondary position; calculating protection limits corresponding to the main and secondary positions while distinguishing whether the failure in the constellation does or does not affect the satellites taken into consideration; and calculating the overall protection limit from the reference position, the main position, the secondary positions, and the protection limits corresponding to the main and secondary positions.
Claim 2
Independent Claim
176 words
A method of locating a moving element by determining a reference position and at least one overall protection limit from data from a group of satellites in a constellation of satellites, the overall protection limit calculation comprising the step of calculating protection limits as a function of probabilities for the absence of failure in the constellation of satellites, and of failure in the constellation of satellites, the method comprising the steps of: from the group of satellites, selecting a subgroup comprising at least five satellites; calculating a main position from the data from a group of satellites; calculating secondary positions from the data from a subgroup of satellites by excluding date from one of the satellites when calculating each secondary position; calculating protection limits corresponding to the main and secondary positions while distinguishing whether the failure in the constellation does or does not affect the satellites taken into consideration; and calculating the overall protection limit from the reference position, the main position, the secondary positions, and the protection limits corresponding to the main and secondary positions.
Claim 3
Dependent Claim
125 words
A method according to claim 1 , in which: for each failure of a data-supplying satellite of the group but not of the subgroup, the corresponding protection limit is calculated on one of the secondary positions; for failure of one data-supplying satellite of the subgroup, a corresponding protection limit is calculated on each secondary position; for failure of two data-providing satellites of the group but not of the subgroup, the protection limit is calculated on one of the secondary positions; and for failure of a data-supplying satellite of the group but not of the subgroup, and of a data-supplying satellite of the subgroup, a corresponding protection limit is calculated on each secondary position; whereby failure of two data-supplying satellites of the subgroup is made negligible.
Claim 4
Dependent Claim
70 words
A method according to claim 1 , comprising steps of calculating an additional secondary position from the subgroup of satellite, for failure of a data-supplying satellite of the group but not of the subgroup, the corresponding protection limit is calculated on the additional secondary position; and for failure of two data-supplying satellites of the group but not of the subgroup, the protection limit is calculated on the additional secondary position.
Claim 5
Dependent Claim
34 words
A method according to claim 1 , in which the horizontal and vertical protection limits are calculated, the method comprising steps of selecting two different subgroups for calculating the horizontal and vertical protection limits.
References Cited (Backward Citations)
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