In this paper, we first introduce the concept of k-globally asymptotic stability and present a differential-difference inequality with infinite delay. By combining nonlinear inequality and nonlinear variation-of-param...In this paper, we first introduce the concept of k-globally asymptotic stability and present a differential-difference inequality with infinite delay. By combining nonlinear inequality and nonlinear variation-of-parameters formula, we derive the k-globally asymptotic stability criteria for nonlinear neutral system with infinite delay. In the end of this paper, an example is given to illustrate our theory.展开更多
针对经典的最小方差无畸变响应波束形成器应用在FDA-BFF(Frequency Diverse Array Based On Fre-quency Filter,FDA-BFF)及FDA-MIMO(Frequency Diverse Array Multiple-Input Multiple-Output,FDA-MIMO)接收机结构时,当阵元数较大或干...针对经典的最小方差无畸变响应波束形成器应用在FDA-BFF(Frequency Diverse Array Based On Fre-quency Filter,FDA-BFF)及FDA-MIMO(Frequency Diverse Array Multiple-Input Multiple-Output,FDA-MIMO)接收机结构时,当阵元数较大或干扰与目标角度维接近时波束主瓣会产生峰值畸变或偏移,波束形成器输出性能下降,无法有效确定目标位置的问题,提出了基于双边小方差无畸变响应的子阵频控阵波束形成算法。该算法将一维均匀线性阵列划分为两个采用不同非线性频偏的中心对称子阵结构,在目标位置形成点状波束,对传统频偏固定的频控阵方向图中的距离-角度实现解耦。之后,通过双边小方差无畸变响应算法中求解克罗内克积的方式降低了算法计算量。仿真验证表明,阵元数较大时该算法在目标位置处形成点状波束的同时,可以有效抑制角度维不可分的干扰。展开更多
基金the National Natural Science Foundation of China (10461006)the Younger Foundation of Yantai University (SX06Z9)
文摘In this paper, we first introduce the concept of k-globally asymptotic stability and present a differential-difference inequality with infinite delay. By combining nonlinear inequality and nonlinear variation-of-parameters formula, we derive the k-globally asymptotic stability criteria for nonlinear neutral system with infinite delay. In the end of this paper, an example is given to illustrate our theory.
文摘针对经典的最小方差无畸变响应波束形成器应用在FDA-BFF(Frequency Diverse Array Based On Fre-quency Filter,FDA-BFF)及FDA-MIMO(Frequency Diverse Array Multiple-Input Multiple-Output,FDA-MIMO)接收机结构时,当阵元数较大或干扰与目标角度维接近时波束主瓣会产生峰值畸变或偏移,波束形成器输出性能下降,无法有效确定目标位置的问题,提出了基于双边小方差无畸变响应的子阵频控阵波束形成算法。该算法将一维均匀线性阵列划分为两个采用不同非线性频偏的中心对称子阵结构,在目标位置形成点状波束,对传统频偏固定的频控阵方向图中的距离-角度实现解耦。之后,通过双边小方差无畸变响应算法中求解克罗内克积的方式降低了算法计算量。仿真验证表明,阵元数较大时该算法在目标位置处形成点状波束的同时,可以有效抑制角度维不可分的干扰。
