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1. WO2019219218 - GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS) MULTIPATH MITIGATION

Publication Number WO/2019/219218
Publication Date 21.11.2019
International Application No. PCT/EP2018/063215
International Filing Date 18.05.2018
IPC
G01S 19/22 2010.1
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
19Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS , GLONASS or GALILEO
13Receivers
22Multipath-related issues
G01S 19/24 2010.1
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
19Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS , GLONASS or GALILEO
13Receivers
24Acquisition or tracking of signals transmitted by the system
CPC
G01S 19/21
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
19Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
13Receivers
21Interference related issues ; ; Issues related to cross-correlation, spoofing or other methods of denial of service
G01S 19/22
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
19Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
13Receivers
22Multipath-related issues
G01S 19/243
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
19Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
13Receivers
24Acquisition or tracking ; or demodulation; of signals transmitted by the system
243Demodulation of navigation message
G01S 19/246
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
19Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
13Receivers
24Acquisition or tracking ; or demodulation; of signals transmitted by the system
246involving long acquisition integration times, extended snapshots of signals or methods specifically directed towards weak signal acquisition
G01S 19/254
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
19Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
13Receivers
24Acquisition or tracking ; or demodulation; of signals transmitted by the system
25involving aiding data received from a cooperating element, e.g. assisted GPS
254relating to Doppler shift of satellite signals
G01S 19/37
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
19Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
13Receivers
35Constructional details or hardware or software details of the signal processing chain
37Hardware or software details of the signal processing chain
Applicants
  • U-BLOX AG [CH]/[CH]
Inventors
  • CHENG, Zhenlan
  • GIGER, Kaspar
  • BRYANT, Roderick, C.
Agents
  • BLAKE, Stephen
Priority Data
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS) MULTIPATH MITIGATION
(FR) ATTÉNUATION DE TRAJETS MULTIPLES DE SYSTÈME MONDIAL DE NAVIGATION PAR SATELLITE (GNSS)
Abstract
(EN) A tracking loop and associated method for tracking a satellite signal in a GNSS receiver and for determining a line-of-sight (LOS) signal from a plurality of satellite signals received by the GNSS receiver from a satellite. One or more first correlators undertake a correlation between a code signal derived from one of the received satellite signals and a plurality of corresponding replica code signals to determine a plurality of code correlation sums comprising a prompt code correlation sum, one or more early code correlation sums and one or more late code correlation sums. One or more second correlators correlate the plurality of code correlation sums with a plurality of replica carrier signals, each having a different Doppler frequency offset, to determine, for each of the plurality of code correlation sums, a set of correlation magnitudes at frequencies of the plurality of replica carrier signals. An LOS identification module identifies the LOS signal based on a signal propagation delay corresponding to one or more local maxima within the sets of correlation magnitudes.
(FR) L'invention concerne une boucle de suivi et un procédé associé permet de suivre un signal de satellite dans un récepteur GNSS et de déterminer un signal de ligne de visée (LOS) à partir d'une pluralité de signaux de satellite reçus par le récepteur GNSS en provenance d'un satellite. Un ou plusieurs premiers corrélateurs réalisent une corrélation entre un signal de code dérivé d'un des signaux de satellite reçus et une pluralité de signaux de code de réplique correspondants pour déterminer une pluralité de sommes de corrélation de codes comprenant une somme de corrélation de codes d'invite, une ou plusieurs sommes de corrélation de codes précoces et une ou plusieurs sommes de corrélation de codes tardifs. Un ou plusieurs seconds corrélateurs mettent en corrélation la pluralité de sommes de corrélation de codes avec une pluralité de signaux de porteuse de réplique, chacun présentant un décalage de fréquence Doppler différent, pour déterminer, pour chaque somme de la pluralité de sommes de corrélation de codes, un ensemble d'amplitudes de corrélation à des fréquences de la pluralité de signaux de porteuse de réplique. Un module d'identification LOS identifie le signal LOS en fonction d'un retard de propagation de signal correspondant à un ou plusieurs maxima locaux dans les ensembles d'amplitudes de corrélation.
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