Method and apparatus for locating mobile receivers using a wide area reference network for propagating ephemeris
First Claim
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1. A method of locating position, comprising:
- receiving satellite telemetry data of a plurality of satellites in a constellation at a server;
obtaining an approximate position of a mobile device at the server;
deriving a pseudo-range model from the satellite telemetry data and the approximate position at the server;
propagating the pseudo-range model from the server to the mobile device;
acquiring a plurality of satellite signals at the mobile device using the pseudo-range model; and
computing position of the mobile device using the plurality of satellite signals.
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Abstract
A method and apparatus for distribution and delivery of global positioning system (GPS) satellite telemetry data using a communication link between a central site and a mobile GPS receiver. The central site is coupled to a network of reference satellite receivers that send telemetry data from all satellites to the central site. The mobile GPS receiver uses the delivered telemetry data to aid its acquisition of the GPS satellite signal. The availability of the satellite telemetry data enhances the mobile receiver'"'"'s signal reception sensitivity.
8 Citations
29 Claims
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1. A method of locating position, comprising:
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receiving satellite telemetry data of a plurality of satellites in a constellation at a server;
obtaining an approximate position of a mobile device at the server;
deriving a pseudo-range model from the satellite telemetry data and the approximate position at the server;
propagating the pseudo-range model from the server to the mobile device;
acquiring a plurality of satellite signals at the mobile device using the pseudo-range model; and
computing position of the mobile device using the plurality of satellite signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of receiving satellite signals, comprising:
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determining a first pseudo-range from a mobile device to a first satellite of a plurality of satellites;
determining a second pseudo-range from the mobile device to a second satellite of the plurality of satellites; and
computing a clock offset and a correlator delay offset in the mobile device using the first pseudo-range and the second pseudo-range. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of receiving satellite signals, comprising:
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estimating a frequency uncertainty associated with a mobile device;
computing a frequency search window having a plurality of search bins for each of a plurality of satellite signals in response to the frequency uncertainty;
searching for undetected satellite signals of the plurality of satellite signals over one or more search bins of the plurality of search bins within the respective frequency search windows for the undetected satellite signals;
improving the frequency uncertainty in response to detection of a satellite signal of the plurality of satellite signals; and
re-computing the frequency search window for each remaining undetected satellite signal of the plurality of satellite signals using the improved frequency uncertainty. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. An apparatus for locating position, comprising:
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means for receiving satellite telemetry data of a plurality of satellites in a constellation at a server;
means for obtaining an approximate position of a mobile device at the server;
means for deriving a pseudo-range model from the satellite telemetry data and the approximate position at the server;
means for propagating the pseudo-range model from the server to the mobile device;
means for acquiring a plurality of satellite signals at the mobile device using the pseudo-range model; and
means for computing position of the mobile device using the plurality of satellite signals.
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25. An apparatus for receiving satellite signals, comprising:
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means for determining a first pseudo-range from a mobile device to a first satellite of a plurality of satellites;
means for determining a second pseudo-range from the mobile device to a second satellite of the plurality of satellites; and
means for computing a clock offset and a correlator delay offset in the mobile device using the first pseudo-range and the second pseudo-range. - View Dependent Claims (26, 27, 28)
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29. An apparatus for receiving satellite signals, comprising:
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means for estimating a frequency uncertainty associated with a mobile device;
means for computing a frequency search window having a plurality of search bins for each of a plurality of satellite signals in response to the frequency uncertainty;
means for searching for undetected satellite signals of the plurality of satellite signals over one or more search bins of the plurality of search bins within the respective frequency search windows for the undetected satellite signals;
means for improving the frequency uncertainty in response to detection of a satellite signal of the plurality of satellite signals; and
means for re-computing the frequency search window for each remaining undetected satellite signal of the plurality of satellite signals using the improved frequency uncertainty.
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Specification