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 improving acquisition sensitivity of a Global Positioning System (GPS) receiver, comprising:
- receiving ephemeris from a reference station network;
generating, using the ephemeris, a first reduced search space for a first satellite signal of a first satellite, wherein the first reduced search space includes a reduced pseudo-range search window and a reduced pseudo-range late search window for the first satellite signal; and
searching for the first satellite signal, within the reduced search space, using a first increased integration time per search bin of the reduced search space.
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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.
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Citations
20 Claims
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1. A method of improving acquisition sensitivity of a Global Positioning System (GPS) receiver, comprising:
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receiving ephemeris from a reference station network; generating, using the ephemeris, a first reduced search space for a first satellite signal of a first satellite, wherein the first reduced search space includes a reduced pseudo-range search window and a reduced pseudo-range late search window for the first satellite signal; and searching for the first satellite signal, within the reduced search space, using a first increased integration time per search bin of the reduced search space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of improving acquisition sensitivity oaf a Global Positioning System (CRS) receiver, comprising:
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generating, using a pseudo-range model, a first reduced search space for a first satellite signal of a first satellite; increasing an integration time per search bin based on the first reduced search space to Generate a first increased integration time per search bin; and searching for the first satellite signal, within the first reduced search space, using the first increased integration time per search bin. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of improving acquisition sensitivity of a Global Positioning System (GPS) receiver, comprising:
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measuring first and second pseudo-ranges, the first and second pseudo-ranges corresponding respectively to first and second satellite signals of first and second satellites; computing a local time offset and a correlator offset using the first and second measured pseudo-ranges; estimating a third pseudo-range for a third satellite signal of a third satellite; and reducing a pseudo-range search window for the third satellite signal using the estimated third pseudo-range. - View Dependent Claims (17, 18, 19, 20)
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Specification