スぺクトラム幅を用いたDOA推定精度の簡易評価法

摘要

In recent years, wireless communications are widely used, and researches on DOA(Direction Of Arrival)estimation techniques and evaluation method for the DOA estimation accuracy have been investigated in order to minimize the effects of interferences on wireless communications. Conventionally, DOA estimation accuracy is examined by comparing the direction of the spectrum peak and true direction of the source. However, to obtain the correct DOA estimaticm accuracy, many trials are required. In this paper, a simplified evaluation method for DOA estimation accuracy using the spectrum width is proposed. And, effectiveness of proposed method is examined. It is numerically shown that the actual accuracy can be estimated by the prq)osed method. Moreover, computational resources can be saved because the number of trials of proposed method is decreased compared with conventional method. It is also shown that the error of the proposed method is reduced less than 0.2deg.%近年，無線通信の普及に伴い干渉波の影響を抑えるためのDOA推定技術およびその精度評価の必要性が高まっている.従来，スペクトラムのピーク位置と波源位置との誤差の期待値から推定精度を評価する手法が用いられている.しかし期待値を得るためには多くの試行を必要とする. 本報告ではDOA推定精度を簡易に評価する手法として，試行ごとの結果のばらつきの少ないスぺクトラム幅を用いる手法を提案する.そして簡易評価法における精度評価の高速性と正確性にっいて検討し，有効性を確認した結果を述べる.簡易評価法によって従来手法より少ない試行回数かつ誤差0.2deg程度で精度推定を把握できることが明らかとなった.