Apparatus and method for time maintenance in a satellite position system receiver
First Claim
1. An apparatus for time maintenance in a satellite positioning system receiver configured to receive data from a plurality of satellites, comprising:
- a store for maintaining timing data derived from almanac data; and
a processor for deriving a first dining information portion using acquired communication signals and a second dining information portion using the stored timing data, and for combining the first and second portions to determine a real time estimate.
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Accused Products
Abstract
A system for maintaining time in a satellite positioning system (SPS) receiver that relies on almanac data to maintain a reasonably accurate time. The approximate time based on almanac data is sufficiently accurate to bound the unknown parameters when a request for position is received. The receiver may automatically update the internal time and/or position. When a time update is required, the approximate time based on almanac data is sufficiently accurate that the receiver need only acquire the code phase from the satellites and can internally determine the code period into the bit and the bit into the week based on the almanac data.
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Citations
7 Claims
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1. An apparatus for time maintenance in a satellite positioning system receiver configured to receive data from a plurality of satellites, comprising:
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a store for maintaining timing data derived from almanac data; and a processor for deriving a first dining information portion using acquired communication signals and a second dining information portion using the stored timing data, and for combining the first and second portions to determine a real time estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification