1. A device for validating measurements of a dynamic magnitude x coming from an article having placed thereon main sensors for sensing along three concurrent main axes forming a basis e={e 1 e 2. .. e p } of a physical space having p=3 dimensions, the sensors serving to measure components V j of said dynamic magnitude x, and the device comprising: at least two additional sensors for measuring at least two additional components of said dynamic magnitude, said at least two additional sensors being placed on said article for sensing along at least two additional axes that are concurrent with said three main axes and that are not contained in any of the planes defined by any pair of said three main axes, said main and additional axes forming a set a={a 1 , a 2 ,. .. , a q } of q observation axes, and said main and additional sensors forming observation sensors; determination means for determining an estimator U representative of said dynamic magnitude from said components V j j∈1:q delivered by said observation sensors; validation means for validating said determination of the estimator U representative of the dynamic magnitude; error detector means for detecting a measurement error associated with said determination of the estimator U representative of the dynamic magnitude; localization means for locating valid components of said dynamic magnitude not giving rise to said measurement error; and reconstitution means for reconstituting a new estimator U representative of said dynamic magnitude from said valid components delivered by said observation sensors.