The target characteristic polarization state in the co-polarized channel for the coherent case was studied in greater detail, with emphasis on the analysis of the characteristic polarization states variable with the t...The target characteristic polarization state in the co-polarized channel for the coherent case was studied in greater detail, with emphasis on the analysis of the characteristic polarization states variable with the target parameters. The Sinclair backscatter matrix was diagonalized under the change of polariza- tion basis via a unitary transformation matrix. Then the diagonal matrix was parameterized by four parameters viz. matrix amplitude, absolute phase, amplitude ratio and phase difference. The behavior of the characteristic polarization states with the varieties of target parameters was discussed together with the power density plot. The characteristic polarization states were displayed on the Poincare sphere and six conclusions were obtained, which provide theoretic support for decreasing the computational complexity of target characteristic polarization state, or anticipating its position in the power density plot. Several simple target cases were considered for validating these conclusions.展开更多
雷达极化检测器性能对比分析可为极化检测器的工程设计提供重要参考,但目前针对其检测性能的评估理论仍不完善,尤其缺乏多视情形下的分析结果.文章以极化雷达多视协方差矩阵的复Wishart分布为基础,采用蒙特卡洛仿真与理论推导得到了7种...雷达极化检测器性能对比分析可为极化检测器的工程设计提供重要参考,但目前针对其检测性能的评估理论仍不完善,尤其缺乏多视情形下的分析结果.文章以极化雷达多视协方差矩阵的复Wishart分布为基础,采用蒙特卡洛仿真与理论推导得到了7种经典极化检测器的多视检测性能曲线,并构建曲线下面积(Area Under Curve,AUC)指标对检测性能进行自动排序.仿真实验结果表明4视处理时的检测性能排序为:最优极化检测器>极化白化滤波器≈似然比检验>最佳能量检测器>极化匹配滤波器≈多视极化能量检测器>单通道检测器.理论推导结果表明,具有线性加权形式的极化检测器,其检测与虚警概率都具有两类等价的数学表达式,其中基于Gamma函数的表达式可用于快速计算出恒虚警检测门限.最后采用全极化合成孔径雷达实测数据,对上述结论进行了验证.展开更多
基金Supported by the National Basic Research Program(973 Program)of China(2013CB329402)the National Natural Science Foundation of China(61473215,61472306,61271302,61272282,61272176)
基金Supported by Department of Electronic Science and Engineering, National University of Defense Technology, China
文摘The target characteristic polarization state in the co-polarized channel for the coherent case was studied in greater detail, with emphasis on the analysis of the characteristic polarization states variable with the target parameters. The Sinclair backscatter matrix was diagonalized under the change of polariza- tion basis via a unitary transformation matrix. Then the diagonal matrix was parameterized by four parameters viz. matrix amplitude, absolute phase, amplitude ratio and phase difference. The behavior of the characteristic polarization states with the varieties of target parameters was discussed together with the power density plot. The characteristic polarization states were displayed on the Poincare sphere and six conclusions were obtained, which provide theoretic support for decreasing the computational complexity of target characteristic polarization state, or anticipating its position in the power density plot. Several simple target cases were considered for validating these conclusions.
文摘雷达极化检测器性能对比分析可为极化检测器的工程设计提供重要参考,但目前针对其检测性能的评估理论仍不完善,尤其缺乏多视情形下的分析结果.文章以极化雷达多视协方差矩阵的复Wishart分布为基础,采用蒙特卡洛仿真与理论推导得到了7种经典极化检测器的多视检测性能曲线,并构建曲线下面积(Area Under Curve,AUC)指标对检测性能进行自动排序.仿真实验结果表明4视处理时的检测性能排序为:最优极化检测器>极化白化滤波器≈似然比检验>最佳能量检测器>极化匹配滤波器≈多视极化能量检测器>单通道检测器.理论推导结果表明,具有线性加权形式的极化检测器,其检测与虚警概率都具有两类等价的数学表达式,其中基于Gamma函数的表达式可用于快速计算出恒虚警检测门限.最后采用全极化合成孔径雷达实测数据,对上述结论进行了验证.
