Method and apparatus for code phase correlation
First Claim
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1. A method of code phase correlation comprising the steps of:
- (a) receiving a subject signal containing a target pseudorandom noise code;
b) generating early and late replica code signals corresponding to the target code;
(c) correlating the subject signal with the early and late replica code signals and returning respective early and late correlation values; and
(d) calculating a code phase discriminator for determining whether the target code has been acquired as a function of the sum of the early and late correlation values.
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Abstract
A method of code phase correlation and apparatus (10 to 15) implementing the same is disclosed, the method comprising the steps of (a) receiving a subject signal comprising a target pseudorandom noise code; (b) generating early and late replica code signals corresponding to the target code; (c) correlating the subject signal with the early and late replica code signals and returning respective early and late correlation values; and (d) calculating a code phase discriminator for determining whether the target code has been acquired as a function of the sum of the early and late correlation values.
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12 Claims
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1. A method of code phase correlation comprising the steps of:
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(a) receiving a subject signal containing a target pseudorandom noise code;
b) generating early and late replica code signals corresponding to the target code;
(c) correlating the subject signal with the early and late replica code signals and returning respective early and late correlation values; and
(d) calculating a code phase discriminator for determining whether the target code has been acquired as a function of the sum of the early and late correlation values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A GPS receiver comprising receiver means for receiving a subject signal containing a target pseudorandom noise code;
- and processing means for generating early and late replica code signals corresponding to the target code, correlating the subject signal with the early and late replica code signals and returning respective early and late correlation values, and calculating a code phase discriminator for determining whether the target code has been acquired as a function of the sum of the early and late correlation values.
- View Dependent Claims (9, 10, 11)
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12. A GPS receiver as hereinbefore described with reference to the accompanying drawings.
Specification