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1. WO1997047985 - SATELLITE SIGNAL RECEIVER WITH DETECTOR OF INCOHERENCE BETWEEN CODE PHASE AND CARRIER FREQUENCY MEASUREMENTS

Publication Number WO/1997/047985
Publication Date 18.12.1997
International Application No. PCT/FR1997/000968
International Filing Date 03.06.1997
Chapter 2 Demand Filed 31.10.1997
IPC
G01S 1/00 2006.01
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
1Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
CPC
G01S 19/07
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
03Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
07providing data for correcting measured positioning data
G01S 19/20
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
20Integrity monitoring, fault detection or fault isolation of space segment
Applicants
  • SEXTANT AVIONIQUE [FR]/[FR] (AllExceptUS)
  • ARETHENS, Jean-Pierre [FR]/[FR] (UsOnly)
Inventors
  • ARETHENS, Jean-Pierre
Agents
  • THOMSON-CSF S.C.P.I.
Priority Data
96/0707407.06.1996FR
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) SATELLITE SIGNAL RECEIVER WITH DETECTOR OF INCOHERENCE BETWEEN CODE PHASE AND CARRIER FREQUENCY MEASUREMENTS
(FR) RECEPTEUR DE SIGNAUX DE SATELLITES AVEC DETECTEUR D'INCOHERENCE ENTRE MESURES PHASE DE CODE ET DE PORTEUSE
Abstract
(EN)
The invention concerns GPS receivers, in particular those located on fixed ground stations and used in differential systems for measuring position. To eliminate as far as possible multiple traverse influence on the precision of the measured position, it is proposed to detect if the position measurements are coherent with the speed measurements, the coherence being measured by the difference variations Vi - dPRCi/dt, where Vi is the relative speed measured on the axis of the ith satellite, and dPRCi/dt is the variation with time of the measured position. If the coherence is not sufficient, the position variations do not correspond to the measured speed, it can be considered that the measurement on this satellite is erroneous, and this satellite is eliminated. In the presence of multiple traverse, the above difference must be seen to vary periodically. This variation detection can done by a Fourier transform on a sufficient number of samples.
(FR)
L'invention concerne les récepteurs GPS, notamment ceux qui sont situés sur des stations fixes au sol et servent dans des systèmes différentiels de mesure de position. Pour éliminer autant que possible l'influence des multitrajets sur la précision de la position mesurée, on propose selon l'invention de détecter si les mesures de position sont cohérentes avec les mesures de vitesse, la cohérence étant mesurée par les variations de la différence Vi-dPRCi/dt, où Vi est la vitesse relative mesurée selon l'axe du iièmesatellite, et dPRCi/dt est la variation temporelle de position mesurée. Si la cohérence n'est pas suffisante, les variations de position ne correspondent pas à la vitesse mesurée, on peut considérer que la mesure sur ce satellite est entachée d'erreur, et on élimine ce satellite. En présence de multitrajets on doit voir la différence ci-dessus varier périodiquement. La détection de cette variation peut se faire par une transformée de Fourier sur un nombre d'échantillons de mesure suffisant.
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