METHODS AND APPARATUS FOR OBTAINING ACCURATE GNSS TIME IN A GNSS RECEIVER
First Claim
1. A method for obtaining Global Navigation Satellite System (GNSS) time in a GNSS receiver, the method comprising:
- deriving a relationship between a first clock signal and the received GNSS time;
latching a second clock signal and the first clock signal at a first latching point;
calculating a first GNSS time corresponding to the first latching point;
latching the first clock signal and the second clock signal at a second latching point; and
calculating a second GNSS time according to the first GNSS time, the first latching point, and the second latching point.
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Accused Products
Abstract
A method for obtaining GNSS time in a GNSS receiver includes: deriving a relationship between a first clock signal and the received GNSS time; latching a second clock signal and the first clock signal at a first latching point to obtain a clock value A1 of the first clock signal and a clock value B1 of the second clock signal; calculating a GNSS time C1 corresponding to the clock value A1 according to the relationship; latching the first clock signal and the second clock signal at a second latching point to obtain a clock value A2 of the first clock signal and a clock value B2 of the second clock signal; and calculating a GNSS time C2 corresponding to the clock value A2 according to the GNSS time C1, the clock value B1, and the clock value B2.
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Citations
20 Claims
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1. A method for obtaining Global Navigation Satellite System (GNSS) time in a GNSS receiver, the method comprising:
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deriving a relationship between a first clock signal and the received GNSS time; latching a second clock signal and the first clock signal at a first latching point; calculating a first GNSS time corresponding to the first latching point; latching the first clock signal and the second clock signal at a second latching point; and calculating a second GNSS time according to the first GNSS time, the first latching point, and the second latching point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for obtaining Global Navigation Satellite System (GNSS) time in a GNSS receiver according to a first clock signal from a first clock source, the apparatus comprising:
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a second clock source for generating a second clock signal; a time-latching logic circuit, coupled to the second clock source, for performing a time-latching operation to latch the first clock signal and the second clock signal at a first latching point, and further latching the first clock signal and the second clock signal at a second latching point; and a processing module, coupled to the second clock source and the time-latching logic circuit, for deriving a relationship between the first clock signal and the GNSS time, calculating a first GNSS time corresponding to the first latching point according to the relationship, and calculating a second GNSS time according to the first GNSS time, the first latching point and the second latching point. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification