SYSTEM AND METHOD FOR GNSS POSITION AIDED SIGNAL ACQUISITION
First Claim
1. A method for acquiring a Global Navigation Satellite System (GNSS) signal, the method comprising:
- estimating an orbital position for at least one GNSS satellite based upon at least one of almanac data and ephemeris data;
detecting a signal emitted from the at least one GNSS satellite; and
based upon the estimated orbital position information for the at least one GNSS satellite, adjusting at least one signal processing parameter used in a GNSS satellite signal acquisition process.
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Accused Products
Abstract
A Global Navigation Satellite System (GNSS) device, such as the Global Positioning System (GPS) device, uses satellite orbital position information from almanac and/or ephemeris data to change a search parameter, such as reducing the number of analyzed frequency bins or setting signal strength threshold, so that satellite signal acquisition times are reduced. An exemplary embodiment estimates an orbital position for at least one GNSS satellite based upon at least one of almanac data and ephemeris data, detects a signal emitted from the at least one GNSS satellite, and based upon the estimated orbital position information for the at least one GNSS satellite that is determined from the almanac data and the ephemeris data, adjusts at least one parameter used in the analysis of the detected signal.
13 Citations
20 Claims
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1. A method for acquiring a Global Navigation Satellite System (GNSS) signal, the method comprising:
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estimating an orbital position for at least one GNSS satellite based upon at least one of almanac data and ephemeris data; detecting a signal emitted from the at least one GNSS satellite; and based upon the estimated orbital position information for the at least one GNSS satellite, adjusting at least one signal processing parameter used in a GNSS satellite signal acquisition process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus that is operable to acquire a Global Positioning System (GNSS) signal, comprising:
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a GNSS front end operable to receive a GNSS signal emitted by at least one GNSS satellite and operable to frequency downconvert the GNSS signal into a downconverted GNSS satellite signal by mixing the GNSS satellite signal with a local oscillator signal to shift the carrier frequency of the incoming GNSS satellite signal; and a GNSS system processor communicatively coupled to the GNSS front end and operable to; receive the downconverted GNSS satellite signal from the GNSS front end; convert the downconverted GNSS satellite signal to a digital GNSS satellite signal; process the digital GNSS satellite signal into a plurality of frequency bins; estimate an orbital position for at least one GNSS satellite based upon at least one of almanac data and ephemeris data; based upon the estimated orbital position information for the at least one GNSS satellite, adjust at least one signal processing parameter used in a GNSS satellite signal acquisition process; and based upon the adjusted signal processing parameter, identify at least one of the frequency bins that corresponds to the GNSS signal emitted by the GNSS satellite. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification