Global positioning system receiver with improved multipath signal rejection
First Claim
1. A global positioning system receiver comprising:
- an inbound signal terminal to receive an inbound global positioning system signal having an inbound PRN code from a global positing system signal source, said inbound PRN code having a plurality of transitions;
a local PRN code generator configured to generate a local PRN code;
a discriminator coupled to said inbound signal terminal and to said local PRN code generator and configured to compare said inbound signal and said local PRN code and to generate a discriminator signal containing a positive portion and a negative portion for each of said transitions in said inbound PRN code; and
a processor coupled to said discriminator and configured to receive said discriminator signal and to process said discriminator signal to determine a phase delay parameter associated with said global positing system signal.
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Accused Products
Abstract
A global positioning system receiver includes an inbound signal terminal to receive an inbound global positioning system signal having an inbound PRN code from a global positing system signal source. A local PRN code generator is configured to generate a local PRN code. A discriminator is coupled to the inbound signal terminal and to the local PRN code generator and configured to compare the inbound signal and the local PRN code and to generate a discriminator signal containing a positive portion and a negative portion. A processor is coupled to the discriminator and configured to receive the discriminator signal to process the discriminator signal to determine a bit code and to determine a distance from the global positing system signal source based on said bit code. In one embodiment, the discriminator includes an acquisition mode configured to acquire the inbound PRN code wherein the discriminator has a first gate width and a tracking mode configured to track the PRN code wherein the discriminator has a second gate width less than the first gate width. Advantages of the invention include improved multipath signal rejection.
70 Citations
18 Claims
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1. A global positioning system receiver comprising:
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an inbound signal terminal to receive an inbound global positioning system signal having an inbound PRN code from a global positing system signal source, said inbound PRN code having a plurality of transitions; a local PRN code generator configured to generate a local PRN code; a discriminator coupled to said inbound signal terminal and to said local PRN code generator and configured to compare said inbound signal and said local PRN code and to generate a discriminator signal containing a positive portion and a negative portion for each of said transitions in said inbound PRN code; and a processor coupled to said discriminator and configured to receive said discriminator signal and to process said discriminator signal to determine a phase delay parameter associated with said global positing system signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of receiving a global positioning system signal comprising the steps of:
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receiving an inbound global positioning system signal having an inbound PRN code from a global positing system signal source, said inbound PRN code having a plurality of transitions; generating a local PRN code; comparing said inbound signal and said local PRN code and generating a discriminator signal containing a positive portion and a negative portion for each of said transitions in said inbound PRN code; processing said discriminator signal; and determining a phase delay parameter associated with said global positioning system signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification