Method and apparatus for processing of satellite signals without time of day information
First Claim
1. A method of locating position of a satellite signal receiver, the method comprising:
- obtaining pseudoranges that estimate the range of the satellite signal receiver to a plurality of satellites;
computing an absolute time and a position using the pseudoranges at a first time;
using the absolute time to compute another position at a subsequent time responsive to computing the absolute time to a predefined accuracy; and
deriving the predefined accuracy from at least one of the pseudoranges, a dilution of precision value related to the plurality of satellite signals, a signal-to-noise ratio of at least one of the plurality of satellite signals, and at least one a-posteriori pseudorange residual.
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Accused Products
Abstract
Method and apparatus for locating position of a satellite signal receiver is described. In one example, pseudoranges are obtained that estimate the range of a satellite signal receiver to a plurality of satellites. An absolute time and a position are computed using the pseudoranges at a first time. The absolute time is then used to compute another position at a subsequent time. In another example, a plurality of states associated with a satellite signal receiver are estimated, where the plurality of states includes a time tag error state. A dynamic model is then formed relating the plurality of states, the dynamic model operative to compute position of the satellite signal receiver.
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Citations
15 Claims
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1. A method of locating position of a satellite signal receiver, the method comprising:
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obtaining pseudoranges that estimate the range of the satellite signal receiver to a plurality of satellites; computing an absolute time and a position using the pseudoranges at a first time; using the absolute time to compute another position at a subsequent time responsive to computing the absolute time to a predefined accuracy; and deriving the predefined accuracy from at least one of the pseudoranges, a dilution of precision value related to the plurality of satellite signals, a signal-to-noise ratio of at least one of the plurality of satellite signals, and at least one a-posteriori pseudorange residual. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of locating position of a satellite signal receiver, the method comprising:
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obtaining pseudoranges that estimate the range of the satellite signal receiver to a plurality of satellites; computing an absolute time and a position using the pseudoranges at a first time; using the absolute time to compute another position at a subsequent time; computing a plurality of time tag errors using the pseudoranges at a respective plurality of times between the first time and the subsequent time; and averaging the plurality of time tag errors to produce the absolute time. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification