Communication link time transfer to improve navigation system accuracy
First Claim
1. A method of improving accuracy in a differential navigation system by time transfer with a two-way communications link comprising the steps of:
- receiving navigation signals with a first navigation receiver to determine navigation measurements at the first navigation receiver;
receiving navigation signals with a second navigation receiver to determine navigation measurements at the second navigation receiver;
determining a time transfer measurement of a time offset between the first navigation receiver and the second navigation receiver with a two-way communications link; and
combining the navigation measurements at the first navigation receiver, the navigation measurements at the second navigation receiver, and the time transfer measurement to compute a differential position.
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Accused Products
Abstract
A method and apparatus for improving differential navigation accuracy uses time transfer over a two-way communications link. The communications link transmits an overall time offset between a differential reference station and a remote user. A differential navigation position solution is modified at the remote user with the overall time offset to improve the differential navigation accuracy. A first time offset between a first communications device and a first navigation receiver at the remote user is determined. A second time offset between the first communications device at the remote user and a second communications device at the differential reference station is determined. A third time offset between the second communications device and a second navigation receiver at the differential reference station is determined. An overall time offset from the first time offset, the second time offset, and the third time offset is computed and used to improve the differential navigation accuracy.
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Citations
6 Claims
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1. A method of improving accuracy in a differential navigation system by time transfer with a two-way communications link comprising the steps of:
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receiving navigation signals with a first navigation receiver to determine navigation measurements at the first navigation receiver; receiving navigation signals with a second navigation receiver to determine navigation measurements at the second navigation receiver; determining a time transfer measurement of a time offset between the first navigation receiver and the second navigation receiver with a two-way communications link; and combining the navigation measurements at the first navigation receiver, the navigation measurements at the second navigation receiver, and the time transfer measurement to compute a differential position. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification