不确定浅海环境中水平阵角度域子空间检测

Detection by angle-domain subspace with horizontal array in uncertain shallow-water environment

在复杂浅海波导中,环境参数的不确定性影响检测的稳健性,故稳健检测是浅海检测中的重要问题.本文结合简正波模型,定义和估计了不确定环境中的水平阵角度域子空间,提出了水平阵角度域子空间检测器及其稳健形式.角度域子空间利用了不同环境参数条件下的水平阵远场观测模型,包含了不确定环境参数信息,估计过程中利用了硬海底条件下传播模态的水平波数与水体、沉积层声速之间的关系,具有较少的先验信息要求和较低的实现复杂度.在此基础上提出的水平阵角度域子空间检测器实现简单,在不确定环境中具有一定的稳健性,但其检测性能随目标方位角起伏.将角度域子空间变换到维数恒定的子空间中,得到角度域子空间检测器的稳健形式,即稳健水平阵角度域子空间检测器,该检测器在不确定环境中具有一定的稳健性,同时检测性能在各目标方位上一致.不确定浅海环境中的仿真结果表明,稳健水平阵角度域子空间检测器具有和能量检测器近似的稳健性,同时提高了检测能力.

The uncertainties of environmental parameters affect the robustness of detection method in complex shallow water.We define and estimate the angle-domain subspaces of horizontal linear array in a proper way under an uncertain environment.According to the angle-domain subspaces,we propose an angle-domain subspace detector and its robust form.Angle-domain subspaces contain an uncertain information by using the observation matrices in different environmental parameters.The relationship between the horizontal wave number of propagating modes and the sound speed of the bottom and sediment in hard seabed is used to estimate the angle-domain subspaces.The proposed angle-domain subspace detector is robust in an uncertain environment,but its detection performance fluctuates with target bearings.The angle domain subspace is transformed into a constant dimension subspace,robust form of the angular domain subspace detector,whose detection performance is consistent in all source bearings.The simulation results in the uncertain shallow-water environment show that the robust angle domain subspace detector has a similar robustness to the energy detector,and better detection capability.