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- W2104781236 abstract "This paper describes all-digital baseband correlation processing of GPS signals. The features of this highly digital mechanization are its (1) potential for improved anti-jamming (AJ) performance, (2) fast acquisition by a digital matched filter, (3) reduction of adjustment, (4) increased system reliability, and (5) provision of a basis for realization of the high degree of very large-scale integration (VLSI) potential for development of small economical GPS sets. Described are an experimental GPS receiver/digital processing system that has been operating for two years, and an improved engineering development model that is now in test. The basic technical approach consists of a broadband, fix-tuned RF converter followed by a digitizer, digital-matched-filter acquisition section; phase-and delay-lock tracking via baseband digital correlation; software acquisition logic and loop filter implementation; and all-digital implementation of the feedback numerically controlled oscillators (NCOs) and code generator. Baseband in-phase (I) and quadrature (Q) tracking is performed by an arctangent angle detector followed by a phase-unwrapping algorithm that eliminates false locks induced by sampling and data bit transitions, and yields a wide pull-in frequency range approaching one-fourth of the loop iteration frequency. Test data from the experimental unit includes basic resolution and computation noise of the digital processing, pseudorange and range-rate errors, and acquisition times for the digital matched filter." @default.
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- W2104781236 date "1981-09-01" @default.
- W2104781236 modified "2023-09-26" @default.
- W2104781236 title "All-Digital GPS Receiver Mechanization" @default.
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- W2104781236 doi "https://doi.org/10.1002/j.2161-4296.1981.tb00765.x" @default.
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