针对互耦误差下,空间谱估计类算法对相干信号的波达方向(Direction of Arrival,DOA)估计性能下降的问题,提出一种基于Toeplize预处理及改进秩损估计器的解相干和解耦合方法.首先对协方差矩阵斜对角线元素求平均,进行Toeplize预处理,实...针对互耦误差下,空间谱估计类算法对相干信号的波达方向(Direction of Arrival,DOA)估计性能下降的问题,提出一种基于Toeplize预处理及改进秩损估计器的解相干和解耦合方法.首先对协方差矩阵斜对角线元素求平均,进行Toeplize预处理,实现解相干;其次利用互耦系数和位置矩阵表示互耦矩阵,进一步变换阵列流形,将信号的角度信息独立于互耦系数,实现解耦合;最后使用改进的秩损估计器,利用谱峰搜索,估计入射信号的DOA.计算机仿真实验验证了本文解相干和解耦合方法的有效性和优越性,而且在低信噪比及小快拍数下依然具有优良的估计性能.展开更多
针对传统MUSIC(multiple signal classification)算法在锥面共形阵列极化-DOA(direction of arrival)参数联合估计过程中计算复杂度较高的问题,利用单极化阵元构造极化敏感锥面共形阵列,并建立阵列接收信号模型.通过构造同极化接收子阵...针对传统MUSIC(multiple signal classification)算法在锥面共形阵列极化-DOA(direction of arrival)参数联合估计过程中计算复杂度较高的问题,利用单极化阵元构造极化敏感锥面共形阵列,并建立阵列接收信号模型.通过构造同极化接收子阵,将导向矢量中空域信息和极化域信息去"耦合",在考虑阵元遮挡效应的条件下,结合秩损原理实现了基于降维MUSIC算法的极化-DOA多参数估计,减小了极化-DOA参数估计的计算量.通过计算机仿真证明了方法的有效性.展开更多
In recent years, a large number of natural disasters happened in China, which caused heavy casualties, property losses and destruction of social order. Emergency self-rescue furniture design for natural disasters was ...In recent years, a large number of natural disasters happened in China, which caused heavy casualties, property losses and destruction of social order. Emergency self-rescue furniture design for natural disasters was taken as the research object in this paper. The definition and meanings of emergency self-rescue furniture were discussed, then the design principles of emergency self-rescue furniture were analyzed, validity of emergency self-rescue furniture design principles and methods for earthquake and flood were verified through demonstrations, finally.展开更多
文摘针对互耦误差下,空间谱估计类算法对相干信号的波达方向(Direction of Arrival,DOA)估计性能下降的问题,提出一种基于Toeplize预处理及改进秩损估计器的解相干和解耦合方法.首先对协方差矩阵斜对角线元素求平均,进行Toeplize预处理,实现解相干;其次利用互耦系数和位置矩阵表示互耦矩阵,进一步变换阵列流形,将信号的角度信息独立于互耦系数,实现解耦合;最后使用改进的秩损估计器,利用谱峰搜索,估计入射信号的DOA.计算机仿真实验验证了本文解相干和解耦合方法的有效性和优越性,而且在低信噪比及小快拍数下依然具有优良的估计性能.
文摘针对传统MUSIC(multiple signal classification)算法在锥面共形阵列极化-DOA(direction of arrival)参数联合估计过程中计算复杂度较高的问题,利用单极化阵元构造极化敏感锥面共形阵列,并建立阵列接收信号模型.通过构造同极化接收子阵,将导向矢量中空域信息和极化域信息去"耦合",在考虑阵元遮挡效应的条件下,结合秩损原理实现了基于降维MUSIC算法的极化-DOA多参数估计,减小了极化-DOA参数估计的计算量.通过计算机仿真证明了方法的有效性.
文摘In recent years, a large number of natural disasters happened in China, which caused heavy casualties, property losses and destruction of social order. Emergency self-rescue furniture design for natural disasters was taken as the research object in this paper. The definition and meanings of emergency self-rescue furniture were discussed, then the design principles of emergency self-rescue furniture were analyzed, validity of emergency self-rescue furniture design principles and methods for earthquake and flood were verified through demonstrations, finally.
