PROBLEM TO BE SOLVED: To prevent excess suppression when a receiving signal after phasing/addition is multiplied by a gain factor for suppressing unnecessary signal components.SOLUTION: A signal addition part 34 adds a plurality of code data (code bits) in a plurality of element-receiving signals, and generates a coefficient (a) on the basis of the addition values. Further, a coefficient (b) for weaken a suppressing action for the unnecessary signal components is calculated when a transmission focus point and a receiving focus point are given to a weighting table 36. A gain-adjusting coefficient (k) is calculated on the basis of the multiplied result of the coefficient (a) and the coefficient (b), by which, then, the receiving signal is multiplied. The suppressing action for the unnecessary signal components is weakened because the farther the sending focus point separates from the receiving focus points, the easier phase disturbance of is caused.COPYRIGHT: (C)2012,JPO&INPIT【課題】整相加算後の受信信号に対して利得係数を乗算して不要信号成分の抑圧を行う場合において、過剰な抑圧とならないようにする。【解決手段】符号加算部34は、複数の素子受信信号における複数の符号データ(符号ビット)を加算し、その加算値に基づいて係数aを生成する。一方、重みテーブル36に対して送信フォーカス点及び受信フォーカス点が与えられると、不要信号成分抑圧作用を弱めるための係数bが演算される。係数aと係数bの乗算結果から利得調整係数kが演算され、それが受信信号に乗算される。送信フォーカス点から受信フォーカス点が離れれば離れるほど位相の乱れが生じやすいので不要信号成分の抑圧作用が弱められる。【選択図】図1
