| 摘要 |
PROBLEM TO BE SOLVED: To correct an error for measuring an angle. SOLUTION: A converter 51 converts a reception amplitude ratio (ΔAZ/Σ) video to off-bore site azimuthΔθand a converter 5 converts a reception amplitude ratio (ΔEL/Σ) video to an off-bore site elevationΔΦ. A gonio correction equipment 1 is provided with azimuth correction equipment 1a1 (for correcting off-bore site azimuth on a slice surface in an off-bore site elevation) or elevation correction equipment 1b (for correcting the off-bore sire elevation on a slide surface in the off-bore site azimuth), corrects the off-bore site azimuth or off- bore site elevation, and brings the value close to a true one. Therefore, accurate azimuthθand elevation≃are outputted from adders 52 and 54.
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