Method and apparatus for reducing the time required to acquire a GPS signal
First Claim
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1. A method of correlating a digital communications signal from a satellite, comprising:
- (a) defining a window equal to a portion of an epoch of said digital communication signal, wherein the portion corresponds to one of a plurality of portions that span the entire epoch;
(b) correlating said digital communication signal across said window;
(c) identifying whether a correlation peak results from said correlating; and
(d) establishing timing parameters for receiving additional digital communication signals from other satellites in response to presence of said correlation peak, wherein said establishing comprises establishing the timing parameters based on a location of the window within the epoch.
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Abstract
A method of correlating a digital communications signal is described. In an example, a window is defined equal to a portion of an epoch of the digital communication signal. The digital communication signal is then correlated across the window. A determination is made as to whether a correlation peak results from the correlating. Timing parameters are then established for receiving additional digital communication signals in response to presence of the correlation peak.
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21 Claims
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1. A method of correlating a digital communications signal from a satellite, comprising:
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(a) defining a window equal to a portion of an epoch of said digital communication signal, wherein the portion corresponds to one of a plurality of portions that span the entire epoch; (b) correlating said digital communication signal across said window; (c) identifying whether a correlation peak results from said correlating; and (d) establishing timing parameters for receiving additional digital communication signals from other satellites in response to presence of said correlation peak, wherein said establishing comprises establishing the timing parameters based on a location of the window within the epoch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of establishing timing synchronization in a GPS receiver, comprising:
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(a) receiving a GPS signal from a first GPS satellite, where the GPS signal repeats over a predefined time period; (b) defining a window equal to a portion of the predefined time period, wherein the portion corresponds to one of a plurality of portions that span the entire predefined time period; (c) correlating said GPS signal across said window; (d) identifying whether a correlation peak results from said correlating; and (e) establishing timing parameters for receiving additional GPS signals transmitted by other GPS satellites in response to presence of said correlation peak, wherein said establishing comprises establishing the timing parameters based on a location of the window within the predefined time period. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of establishing timing synchronization in a multi-channel GPS receiver, comprising:
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(a) receiving a first GPS signal from a first GPS satellite using a first channel of the GPS receiver, where the first GPS signal repeats over a predefined time period; (b) defining a window equal to a half of the predefined time period; (c) correlating said first GPS signal across said window; (d) identifying whether a correlation peak results from said correlating; and (e) establishing timing parameters in a second channel of the GPS receiver for receiving a second GPS signal transmitted by a second GPS satellite in response to presence of said correlation peak, wherein said establishing comprises establishing the timing parameters based on a location of the window within the predefined time period. - View Dependent Claims (18)
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19. An apparatus for correlating a digital communication signal from a satellite, comprising:
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a correlator for correlating said digital communication signal across a window equal to a portion of a predefined period of said digital communication signal; a microcontroller for identifying whether a correlation peak results from said correlating and for establishing timing parameters for receiving additional digital communication signals from other satellites in response to presence of said correlation peak, wherein the microcontroller establishes the timing parameters based on a location of the window within the predefined time period. - View Dependent Claims (20, 21)
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Specification