Multipath noise reduction for spread spectrum signals

Details Multipath noise reduction for spread spectrum signals Multipath noise reduction for spread spectrum signals

1993-03-17

1994-09-13

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

375 10, 375 34, 375 58, 375 99, 380 2, 380 34, 455 501, 455 63, 455 65, 455 671, 455 673, 4552261, 455296, H04L 2730

Patent

active

053475364

ABSTRACT:
The invention includes the concepts of early-prompt delay tracking, multipath correction of early-prompt delay tracking from correlation shape and carrier phase multipath correction. In early-prompt delay tracking, since multipath is always delayed with respect to the direct signals, the system derives phase and pseudorange observables from earlier correlation lags. In multipath correction of early-prompt delay tracking from correlation shape, the system looks for relative variations of amplitude across the code correlation function that do not match the predicted multipath-free code cross-correlation shape. The system then uses deviations from the multipath-free shape to infer the magnitude of multipath, and to generate corrections pseudorange observables. In carrier phase multipath correction, the system looks for variations of phase among plural early and prompt lags. The system uses the measured phase variations, along with the general principle that the multipath errors are larger for later lags, to infer the presence of multipath, and to generate corrections for carrier-phase observables.

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patent: 4151524 (1979-04-01), Caputi, Jr.
patent: 4266296 (1981-05-01), Ishigaki
patent: 4457007 (1984-06-01), Gutleber
patent: 4669091 (1987-05-01), Nossen
patent: 4672638 (1987-06-01), Taguchi et al.
patent: 5224122 (1993-06-01), Bruckert

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