PURPOSE:To correct the errors in angle measurement. CONSTITUTION:A monopulse/off-boresight azimuth converter 51 converts the video of a received amplitude ratio (DELTAAZ/SIGMA) into the off-boresight azimuth DELTAtheta. A monopulse/off-boresight elevation converter 53 converts the video of a received amplitude ratio (DELTAEL/SIGMA) into an off-boresight elevation phi. In a measured- angle correcting device 1, azimuth correcting devices 1a1 and 1a2 (correct the off-boresight azimuth at the slice surface at the off-boresight elevation) and an elevation correcting device 1b (corrects the off-boresight elevation at the slice surface of the off-boresight azimuth) are alternately arranged. In this constitution, the off-boresight azimuth and the off-boresight elevation are corrected and updated and brought to the true values. Therefore, the accurate azimuth theta and elevation phi are outputted from adders 52 and 54.
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