Reference Satellite
First Claim
1. An apparatus for determining the location of a receiver in dependence on signalling events transmitted to the receiver by a satellite constellation comprising a reference satellite and one or more other satellites, the apparatus being arranged to:
- for each of the one or more other satellites, compare an indication of the transit time of a signalling event transmitted by that satellite and an indication of the transit time of a signalling event transmitted by the reference satellite; and
calculate the location of the receiver in dependence on those comparisons;
the apparatus being further arranged to determine, for each of the satellites in the constellation, an indication of an error that would be incorporated in the comparisons if that satellite were selected as the reference satellite and to designate one of the satellites in the constellation as the reference satellite in dependence on those indications.
2 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for determining the location of a receiver in dependence on signalling events transmitted to the receiver by a satellite constellation comprising a reference satellite and one or more other satellites, the apparatus being arranged to, for each of the one or more satellites, compare an indication of the transit time of the signalling event transmitted by that satellite and an indication of the transit time of the signalling event transmitted by the reference satellite and calculate the location of the receiver in dependence on those comparisons; the apparatus being further arranged to determine, for each of the satellites in the constellation, an indication of an error that would be incorporated in the comparisons if that satellite were selected as the reference satellite and to designate one of the satellites in the constellation as the reference satellite in dependence on those indications.
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Citations
20 Claims
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1. An apparatus for determining the location of a receiver in dependence on signalling events transmitted to the receiver by a satellite constellation comprising a reference satellite and one or more other satellites, the apparatus being arranged to:
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for each of the one or more other satellites, compare an indication of the transit time of a signalling event transmitted by that satellite and an indication of the transit time of a signalling event transmitted by the reference satellite; and calculate the location of the receiver in dependence on those comparisons; the apparatus being further arranged to determine, for each of the satellites in the constellation, an indication of an error that would be incorporated in the comparisons if that satellite were selected as the reference satellite and to designate one of the satellites in the constellation as the reference satellite in dependence on those indications. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for determining the location of a receiver in dependence on signalling events transmitted to the receiver by a satellite constellation comprising a reference satellite and one or more other satellites, the method comprising:
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for each of the one or more satellites, comparing an indication of the transit time of the signalling event transmitted by that satellite and an indication of the transit time of the signalling event transmitted by the reference satellite; and calculating the location of the receiver in dependence on those comparisons; the method further comprising determining, for each of the satellites in the constellation, an indication of an error that would be incorporated in the comparisons if that satellite were selected as the reference satellite and selecting the reference satellite in dependence on those indications.
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20. A computer-readable medium encoded with instructions, that when executed by an apparatus for determining the location of a receiver in dependence on signalling events transmitted to the receiver by a satellite constellation comprising a reference satellite and one or more other satellites, cause the apparatus to:
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for each of the one or more satellites, compare an indication of the transit time of the signalling event transmitted by that satellite and an indication of the transit time of the signalling event transmitted by the reference satellite; and calculate the location of the receiver in dependence on those comparisons; the instructions further causing the apparatus to determine, for each of the satellites in the constellation, an indication of an error that would be incorporated in the comparisons if that satellite were selected as the reference satellite and to select the reference satellite in dependence on those indications.
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Specification