PURPOSE:To obtain high speed convergence to the suppression of a disturbing wave incoming from multi-direction by adopting a Gram-Schmidt type cascade connection to a decoration processing section consisting of an open loop circuit. CONSTITUTION:The decoration processing sections (DP) 1a-1f constitute the side lobe canceller when one auxiliary antenna is used and an open loop circuit comprising a complex conjugation arithmetic unit 2, averaging circuits 3a, 3b, a multiplier 4, a divider 5 and a subtractor 6 and not feeding back the processed output to the input. Since many input signals are subjected orthogonal processing and the open loop circuit according to the algorithm of high speed convergence is used for the components for the Gram-Schmidt type cascade connection having fast convergence, the high speed convergence is maintained.
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