Method and apparatus for combining measurements and determining clock offsets between different satellite positioning systems
First Claim
1. A method of processing satellite signals from a first satellite navigation system and a second satellite navigation system, comprising:
- measuring at least one first pseudorange between a satellite signal receiver and at least one satellite of said first satellite navigation system, said first satellite navigation system conforming to a first protocol having a first time reference frame;
measuring at least one second pseudorange between said satellite signal receiver and at least one satellite of said second satellite navigation system, said second satellite navigation system conforming to a second protocol having a second time reference frame;
obtaining a difference between the first time reference frame and the second time reference frame; and
combining said at least one first pseudorange and said at least one second pseudorange using said difference.
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Abstract
Method and apparatus for processing satellite signals from a first satellite navigation system and a second satellite navigation system is described. In one example, at least one first pseudorange between a satellite signal receiver and at least one satellite of the first satellite navigation system is measured. At least one second pseudorange between the satellite signal receiver and at least one satellite of the second satellite navigation system is measured. A difference between a first time reference frame of the first satellite navigation system and a second time reference frame of the second satellite navigation system is obtained. The at least one first pseudorange and the at least one second pseudorange are combined using the difference in time references.
82 Citations
20 Claims
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1. A method of processing satellite signals from a first satellite navigation system and a second satellite navigation system, comprising:
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measuring at least one first pseudorange between a satellite signal receiver and at least one satellite of said first satellite navigation system, said first satellite navigation system conforming to a first protocol having a first time reference frame; measuring at least one second pseudorange between said satellite signal receiver and at least one satellite of said second satellite navigation system, said second satellite navigation system conforming to a second protocol having a second time reference frame; obtaining a difference between the first time reference frame and the second time reference frame; and combining said at least one first pseudorange and said at least one second pseudorange using said difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A position location system, comprising:
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satellite signal receiver circuitry for measuring at least one first pseudorange to at least one satellite of a first satellite navigation system and at least one second pseudorange to at least one satellite of a second satellite navigation system, said first and second satellite navigation systems conforming to respective first and second protocols, said first and second protocol having respective first and second time reference frames; and a processor for obtaining a difference between the first time reference frame and the second time reference frame and for combining said at least one first pseudorange and said at least one second pseudorange using said difference. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. Apparatus for processing satellite signals from a first satellite navigation system and a second satellite navigation system, comprising:
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means for measuring at least one first pseudorange between a satellite signal receiver and at least one satellite of said first satellite navigation system said first satellite navigation system conforming to a first protocol having a first time reference frame; means for measuring at least one second pseudorange between said satellite signal receiver and at least one satellite of said second satellite navigation system, said second satellite navigation system conforming to a second protocol having a second time reference frame; means for obtaining a difference between the first time reference frame and the second time reference frame; and means for combining said at least one first pseudorange and said at least one second pseudorange using said difference. - View Dependent Claims (19, 20)
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Specification