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- W2588213475 abstract "This paper presents the design of an attitudedetermination concept based on differential carrierphase measurements. The results of the investigationsare illustrated with the example of an application toMetOp, the European Polar Meteorological Satellite,developed by ESA for EUMETSAT. Both nominal andsafe modes of operation of the attitude control systemare addressed. The paper analyses the drivers of theconcept and possible differential multipath mitigationtechniques and presents a detailed analysis of theselected technique based on a Kalman filter withsolved-for differential multipath parameters. This iscompared to the classical scheme in which noestimation of the differential multipath parameters isdone. For the safe mode, a suitable approach using theattitude point solution is developed. The null spacemethod (NSM) is selected for solving the integerambiguity resolution problem (OFAR). Improvementsof such a method for speeding up the algorithm arepresented. A performance analysis is presented for thethree concepts under investigation.The performances of the concept with differentialmultipath estimation is assessed through a sensitivityanalysis with respect to the multipath characteristics,angular rate disturbances, receiver, antennacharacteristics and filter update frequency. Furthermore,different configuration of antennas are analyzed. Theperformance of the selected OFAR technique isassessed in terms of convergence, CPU time, andsensitivity to the initial attitude knowledge error, initialangular velocity, receiver characteristics and multipatheffects. Finally, the performance for the safe mode ispresented, including the sensitivity to the initial attitudewhich is the most critical parameter.The study shows that the MetOp nominal pointingmode accuracy requirements can be fulfilled using aKalman filter which estimates also the differentialmultipath. The preferred configuration has fourantennae located in the vertices of a 0.5 m square. Thisallows to mount the antennas in a dedicated carbonfibre reinforced structure in order to improve structuralstability. The use of narrow FOV antennas is proposedto minimise differential multipath effects. For theOFAR technique, the study shows that the NSMalgorithm is very robust giving no failures, evenwithout any attitude knowledge. CPU time for theOFAR depends strongly on the number of satellitesconsidered: starting the computation with a small set ofsatellites leads to important time savings. For the safemode, the study shows that a baseline length of 0.2 mis preferable in order to avoid the complexity of OFARtechniques: this would provide a worst caseperformance of 8”. On the other hand and for anantenna baseline of 0.5 m, the attitude determinationaccuracy is always better than 3”." @default.
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- W2588213475 date "1995-09-15" @default.
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- W2588213475 title "A GNSS-based Attitude Determination System for Low-Earth Observation Satellites" @default.
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