机动拖线阵宽带方位估计的克拉美-罗界研究

摘要

针对现有水下远场宽带目标方位估计的克拉美-罗界(CRB)都是基于阵形不变的刚性基阵,无法全面揭示柔性拖线阵在实际机动条件下的CRB特性和具体影响因素等问题,首先依据拖线阵的机动特性建立了机动拖线阵宽带频域信号模型;然后,推导了机动拖线阵的水下宽带目标方位估计的 CRB解析表达式.在此基础上,进一步计算分析了在不同阵列机动参数与目标特性等情况下的 CRB特性,从而为机动拖线阵宽带高分辨方法的研究及应用性能评价提供了理论依据.%The existing Cramer-Rao bounds (CRB)of underwater far-field wideband direction-of-arrival(DOA)estimation are proposed based on the rigid array with invariant shape.The characteris-tics and influence factors of CRBs cannot be fully revealed for the maneuvering flexible towed linear array.Thus,first of all,based on the dynamic characteristics of the towed array,the wideband fre-quency domain received signal model is established,and then the analytical expression of CRB for wideband DOA estimation of maneuvering towed linear array is deduced.Under the conditions of different maneuvering factors and target characteristics,the CRB is calculated and analyzed,which provides the theoretical basis for the research and performance evaluation of wideband high resolution algorithms.