水中音源到来方向推定におけるマルチパス干渉に強い到達時間差測定アルゴリズム

抄録

In this paper, we propose a time difference of arrival (TDOA) measurement algorithm resistant to multipath interference in estimating direction of arrival (DOA) of an underwater sound source. In strong multipath interference, the pseudo-peaks caused by reflected affect the correlation function, which makes it difficult to detect the peak with correct time position and leads to a large TDOA measurement error. The proposed method detects the arrival time difference by cross-correlating two impulse responses measured using a reference signal, and realizes a TDOA measurement that is resistant to multipath interference. We discuss the effectiveness of the proposed method by using an underwater acoustic reflection model, and report its performance by comparing the conventional method and the proposed method by our simulation and experiment.