Phase multi-path mitigation

Details Phase multi-path mitigation Phase multi-path mitigation

2004-10-18

2008-11-18

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S149000, C375S354000, C375S371000

Reexamination Certificate

active

07453925

ABSTRACT:
A system and method for mitigating a multi-path-induced error in a global navigation satellite system (GNSS) is described. In one embodiment of the method, a composite signal is received. The composite signal includes a band-limited direct-path signal and at least one band-limited multi-path signal that are each modulated with periodic phase reversals. The composite signal is measured as a function of time during a time interval having at least one of the periodic phase reversals. A phase error φεbetween the composite signal and the direct-path signal due to the multi-path signal is determined using the measured composite signal as a function of time and a pre-determined filter characteristic corresponding to a filter used to band limit the direct-path signal and the multi-path signal. The phase error φεin a navigation computation is corrected.

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