Method of compactly communicating ionospheric and tropospheric corrections in a network of global navigation system satellite receivers
First Claim
1. A method of communicating corrections for information related to satellite signals from a first global navigation satellite system (GNSS) apparatus at a first location to a second GNSS apparatus at a second location comprising:
- determining at the first GNSS apparatus for a first satellite in a constellation of satellites a first ionosphere correction for ionosphere signal path delay;
determining at the first GNSS apparatus a second ionosphere correction for a second satellite which is assumed to be directly over the first location;
comparing the first ionosphere correction to the second ionosphere correction for ionosphere signal path delay;
calculating a difference between the first ionosphere correction and the second ionosphere correction; and
transmitting from the first GNSS apparatus to the second GNSS apparatus a message including only the difference between the first ionosphere correction and the second ionosphere correction.
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Abstract
A method of communicating corrections for information related to satellite signals among global navigation satellite system (GNSS) receivers is described. An ionosphere correction for ionosphere signal path delay is determined for a first satellite. This ionosphere correction is then compared to an ionosphere correction for ionosphere signal path delay for a satellite assumed to be directly over the receiver. The receiver then sends a message which includes only the difference between the ionosphere correction for the actual observation and the ionosphere correction for a satellite assumed to be at the zenith.
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Citations
15 Claims
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1. A method of communicating corrections for information related to satellite signals from a first global navigation satellite system (GNSS) apparatus at a first location to a second GNSS apparatus at a second location comprising:
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determining at the first GNSS apparatus for a first satellite in a constellation of satellites a first ionosphere correction for ionosphere signal path delay; determining at the first GNSS apparatus a second ionosphere correction for a second satellite which is assumed to be directly over the first location; comparing the first ionosphere correction to the second ionosphere correction for ionosphere signal path delay; calculating a difference between the first ionosphere correction and the second ionosphere correction; and transmitting from the first GNSS apparatus to the second GNSS apparatus a message including only the difference between the first ionosphere correction and the second ionosphere correction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification