Two-dimensional DOA estimation based on thin array towed by a small autonomous platform

The small autonomous platform with a thin line array is an important tool for underwater acoustic mobile surveillance.Generally,only one-dimensional(1-D)direction-of-arrival(DOA)of the source signal can be estimated using a thin towed line array.In this work,the two-dimensional(2-D)DOA estimation is achieved by the thin line array towed by a small autonomous platform due to its flexible maneuver.Two perpendicular tow paths are formed through the fast turning of this array.An L-shaped array is formed by the same towed array on these two tow paths at different times.Using the array on these two straight paths,two 1-D DOAs of the source signal are obtained respectively,and then the 2-D DOA based on the formed L-shaped array can be estimated.The effectiveness of proposed approach is verified by numerical simulations and its theoretical error is analyzed.

主、被动拖曳线列阵远程目标定位

该文讨论了主、被动拖曳线列阵的远程定位问题。首先得到了主、被动拖曳线列阵接收的散射声场方程,利用简正波滤波新方法,通过短线阵的水平移动,实现远程目标方位、深度及距离的定位。数值仿真结果表明,通过阵列的移动,可以合成大的孔径,提高目标的方位、距离估计精度。对主、被动拖曳线列阵,利用简正波滤波方法可以很有效地实现对目标方位、深度及距离的估计。