Method and apparatus for characterizing multipath...

G - Physics – 01 – S

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G01S 1/04 (2006.01) G01S 1/00 (2006.01)

Patent

CA 2319432

An apparatus for characterizing multipath interference is disclosed. An antenna receives signals that include right-hand circularly polarized (RHCP) transmitted signals, left-hand circularly polarized (LHCP) multipath interference and linearly polarized multipath interference. Right hand signals are preferentially derived from the RHCP signals and left-hand signals are preferentially derived from the LHCP signals. The right-hand signals (multipath attenuated with respect to the line-of-sight signal) and left-hand signals (line-of-sight signal attenuated with respect to the multipath) are separately processed in normal fashion. The resulting range, signal strength and/or carrier phase estimates for right-hand and left-hand signals are then compared to detect the presence of multipath interference and to determine the degree to which it has degraded the readings obtained from the right-hand channel.

La présente invention concerne un dispositif destiné à caractériser des interférences propres aux trajets multiples. Une antenne reçoit des signaux qui comprennent des signaux émis polarisés circulairement dextrorsum (PCD), des interférences propres aux trajets multiples polarisées circulairement sinistrorsum (PCS) et des interférences propres aux trajets multiples polarisées linéairement. Les signaux dextrorsum sont dérivés, de préférence, des signaux PCD et les signaux sinistrorsum sont dérivés, de préférence, des signaux PCS. Les signaux dextrorsum (à trajets multiples atténués par rapport au signal en ligne droite) et les signaux sinistrorsum (de signal en ligne droite atténué par rapport aux trajets multiples) sont traités séparément de façon normale. Les estimations de distance, de force de signal et/ou d'onde porteuse des signaux dextrorsum et sinistrorsum sont alors comparées afin de détecter la présence d'interférences propres aux trajets multiples et de déterminer le degré de dégradation des lectures obtenues du canal dextrorsum.

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