PROBLEM TO BE SOLVED: To solve such a problem that aberration cannot be suppressed suitably over the whole reflecting surface of a main reflection mirror unit 3 since the aberration caused by measurement in a Fresnel region by moving a practical sub-reflection mirror 4 in a conventional method for measuring the precision of the mirror surface of a mirror surface antenna 1 by using a high-frequency measuring radio wave. ;SOLUTION: This system uses an aberration correction sub-reflection mirror 12 in the shape of a mirror surface for compensating the aberration caused by measurement in the Fresnel region.;COPYRIGHT: (C)2001,JPO
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