Uniform linear array(ULA)radars are widely used in the collision-avoidance radar systems of small unmanned aerial vehicles(UAVs).In practice,a ULA's multi-target direction of arrival(DOA)estimation performance suf...Uniform linear array(ULA)radars are widely used in the collision-avoidance radar systems of small unmanned aerial vehicles(UAVs).In practice,a ULA's multi-target direction of arrival(DOA)estimation performance suffers from significant performance degradation owing to the limited number of physical elements.To improve the underdetermined DOA estimation performance of a ULA radar mounted on a small UAV platform,we propose a nonuniform linear motion sampling underdetermined DOA estimation method.Using the motion of the UAV platform,the echo signal is sampled at different positions.Then,according to the concept of difference co-array,a virtual ULA with multiple array elements and a large aperture is synthesized to increase the degrees of freedom(DOFs).Through position analysis of the original and motion arrays,we propose a nonuniform linear motion sampling method based on ULA for determining the optimal DOFs.Under the condition of no increase in the aperture of the physical array,the proposed method obtains a high DOF with fewer sampling runs and greatly improves the underdetermined DOA estimation performance of ULA.The results of numerical simulations conducted herein verify the superior performance of the proposed method.展开更多
提升航空器运行效率,获取航空运输利益最大化,是中国民航一直以来追求的目标。研究表明,EoR进近(Established on RNP AR)在提升近距平行跑道运行效率方面具有不可替代的优势,因此受到业界广泛关注。将EoR进近与排序策略结合,以航班延误...提升航空器运行效率,获取航空运输利益最大化,是中国民航一直以来追求的目标。研究表明,EoR进近(Established on RNP AR)在提升近距平行跑道运行效率方面具有不可替代的优势,因此受到业界广泛关注。将EoR进近与排序策略结合,以航班延误时间最小为目标函数,建立基于EoR的排序模型。对比分析基于EoR的独立运行与相关运行对航班延误时间的影响。针对大规模航班排序计算时解空间较大且要求时效性的特点,提出一种基于S形函数的自适应粒子群优化算法(S-shaped function based adaptive particle swarm optimization,SA-PSO)对模型进行求解。以昆明长水国际机场终端区为例进行实例验证,尾流安全间隔上,采用中国民航航空器尾流重新分类(RECAT-CN)运行标准。结果表明:EoR独立运行较相关运行减少总延误约38%、EoR独立运行模式下,本文算法较先到先服务(first come first served,FCFS)算法减少总延误约15.3%。展开更多
基金National Natural Science Foundation of China(61973037)National 173 Program Project(2019-JCJQ-ZD-324)。
文摘Uniform linear array(ULA)radars are widely used in the collision-avoidance radar systems of small unmanned aerial vehicles(UAVs).In practice,a ULA's multi-target direction of arrival(DOA)estimation performance suffers from significant performance degradation owing to the limited number of physical elements.To improve the underdetermined DOA estimation performance of a ULA radar mounted on a small UAV platform,we propose a nonuniform linear motion sampling underdetermined DOA estimation method.Using the motion of the UAV platform,the echo signal is sampled at different positions.Then,according to the concept of difference co-array,a virtual ULA with multiple array elements and a large aperture is synthesized to increase the degrees of freedom(DOFs).Through position analysis of the original and motion arrays,we propose a nonuniform linear motion sampling method based on ULA for determining the optimal DOFs.Under the condition of no increase in the aperture of the physical array,the proposed method obtains a high DOF with fewer sampling runs and greatly improves the underdetermined DOA estimation performance of ULA.The results of numerical simulations conducted herein verify the superior performance of the proposed method.
文摘提升航空器运行效率,获取航空运输利益最大化,是中国民航一直以来追求的目标。研究表明,EoR进近(Established on RNP AR)在提升近距平行跑道运行效率方面具有不可替代的优势,因此受到业界广泛关注。将EoR进近与排序策略结合,以航班延误时间最小为目标函数,建立基于EoR的排序模型。对比分析基于EoR的独立运行与相关运行对航班延误时间的影响。针对大规模航班排序计算时解空间较大且要求时效性的特点,提出一种基于S形函数的自适应粒子群优化算法(S-shaped function based adaptive particle swarm optimization,SA-PSO)对模型进行求解。以昆明长水国际机场终端区为例进行实例验证,尾流安全间隔上,采用中国民航航空器尾流重新分类(RECAT-CN)运行标准。结果表明:EoR独立运行较相关运行减少总延误约38%、EoR独立运行模式下,本文算法较先到先服务(first come first served,FCFS)算法减少总延误约15.3%。
