System and method for refining a position estimate of a low earth orbiting satellite
First Claim
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1. A method for refining a position estimate of a low earth orbiting (LEO) satellite:
- generating a first position estimate of a LEO satellite by a GNSS receiver on-board said LEO satellite;
communicating said first position estimate to a Virtual Reference Station (VRS) processor;
receiving VRS corrections at said LEO satellite, said VRS corrections calculated for said first position estimate by said VRS processor; and
processing said VRS corrections on-board said LEO satellite such that a VRS corrected LEO satellite position estimate of said LEO satellite is generated for said first position estimate.
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Abstract
In a method for refining a position estimate of a low earth orbiting (LEO) satellite a first position estimate of a LEO satellite is obtained with a GNSS receiver on-board the LEO satellite. The first position estimate is communicated to a Virtual Reference Station (VRS) processor. VRS corrections are received at the LEO satellite, the VRS corrections having been calculated for the first position estimate by the VRS processor. The VRS corrections are processed on-board the LEO satellite such that a VRS corrected LEO satellite position estimate of the LEO satellite is generated for the first position estimate.
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Citations
24 Claims
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1. A method for refining a position estimate of a low earth orbiting (LEO) satellite:
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generating a first position estimate of a LEO satellite by a GNSS receiver on-board said LEO satellite; communicating said first position estimate to a Virtual Reference Station (VRS) processor; receiving VRS corrections at said LEO satellite, said VRS corrections calculated for said first position estimate by said VRS processor; and processing said VRS corrections on-board said LEO satellite such that a VRS corrected LEO satellite position estimate of said LEO satellite is generated for said first position estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A positioning and navigation system comprising:
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a global navigation satellite system (GNSS) receiver, coupled with a Low Earth Orbiting (LEO) satellite and configured for measuring GNSS broadcast observables for use in generating, by said GNSS receiver, a first position estimate indicative of an approximate position of said LEO satellite; a virtual reference station (VRS) processor, configured for processing broadcast observables received from a plurality of GNSS receivers including a plurality of GNSS reference receivers, to generate VRS corrections for said first position estimate; and a corrections processor for processing said VRS corrections on-board said LEO satellite such that a VRS corrected LEO satellite position estimate is produced. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A low earth orbiting (LEO) satellite position determination system, said system comprising:
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a global navigation satellite system (GNSS) receiver coupled with a LEO satellite, and configured for measuring GNSS broadcast observables for use in generating, by said GNSS receiver, a first position estimate indicative of an approximate position of said LEO satellite; a communications subsystem of said LEO satellite, configured for transmitting a first radio frequency message comprising said first position estimate, said first position estimate being conveyed to a VRS processor for use in generating VRS corrections; said communications subsystem further configured for receiving a second radio frequency message comprising a corrections message generated by said VRS processor, said corrections message comprising said VRS corrections; and a corrections processor for processing a received corrections message on-board said LEO satellite such that a VRS corrected LEO satellite position estimate is generated. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification