Cellphone GPS positioning system
First Claim
1. A location system, comprising:
- a mobile radio transceiver for transmitting a radio positioning signal and receiving a radio system signal having a radio positioning system (RPS)-based time and an RPS-based position jointly derived from said radio positioning signal; and
a mobile global navigation satellite system (GNSS) receiver including a code range selector using said RPS-based time and said RPS-based position for selecting a code search range and a code recovery circuit using said code search range for acquiring a GNSS signal; and
wherein;
the code range selector includes a bootstrap clock for determining an elapsed time from a time-of-transmission (TOT) of said radio positioning signal and a GNSS time estimator for using said elapsed time and said RPS-based time for providing an RPS-based GNSS time estimate; and
the code range selector uses said RPS-based GNSS time estimate for selecting said code search range.
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Accused Products
Abstract
A mobile GPS location system. The location system includes a mobile radio transceiver for transmitting a radio positioning signal and receiving a responsive radio system signal having a radio positioning system (RPS)-based time and position derived from the radio positioning signal; a mobile global positioning system (GPS) receiver; and a code range selector using the RPS-based time and position for selecting a code search range. The mobile GPS receiver uses the code search range for focusing a code phase search to a narrow range for rapidly acquiring a GPS signal. The RPS-based time and position are derived from a plurality of radio signal times-of-arrival (TOA)s determined by a plurality of system units from the radio positioning signal.
79 Citations
24 Claims
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1. A location system, comprising:
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a mobile radio transceiver for transmitting a radio positioning signal and receiving a radio system signal having a radio positioning system (RPS)-based time and an RPS-based position jointly derived from said radio positioning signal; and a mobile global navigation satellite system (GNSS) receiver including a code range selector using said RPS-based time and said RPS-based position for selecting a code search range and a code recovery circuit using said code search range for acquiring a GNSS signal; and
wherein;the code range selector includes a bootstrap clock for determining an elapsed time from a time-of-transmission (TOT) of said radio positioning signal and a GNSS time estimator for using said elapsed time and said RPS-based time for providing an RPS-based GNSS time estimate; and the code range selector uses said RPS-based GNSS time estimate for selecting said code search range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A mobile location method, comprising:
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transmitting a radio positioning signal from a mobile unit; receiving a radio system signal in said mobile unit having a radio positioning system (RPS)-based time and an RPS-based position jointly derived from said radio positioning signal; selecting a code search range according to said RPS-based time and said RPS-based position; and acquiring a GNSS signal using said selected code search range; and
wherein;selecting said code search range includes;
determining an elapsed time in said mobile unit from a time-of-transmission (TOT) of said radio positioning signal;
using said TOT elapsed time with said RPS-based time for providing an RPS-based GNSS time estimate; and
using said RPS-based GNSS time estimate for selecting said code search range. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification