The approach to estimate the length of extended targets by using the bistatic high resolution range profile（ H RRP） is analyzed in this paper. The relationship between the bistatic H RRP and the monostatic H RRP of ...The approach to estimate the length of extended targets by using the bistatic high resolution range profile（ H RRP） is analyzed in this paper. The relationship between the bistatic H RRP and the monostatic H RRP of extended targets are investigated. It is demonstrated by simulations that the target length measured by the bistatic H RRP is more meaningful and accurate than that by the monostatic HRRP,though the monostatic H RRP has been well developed and widely used in target recognizing and classification. The estimation results of a cone shaped target are present and compared at the end of the paper. To assure the reliability of the simulation,the bistatic H RRP is obtained through the scattering field data calculated by a fullwave numerical method,FE-BI-MLFMA.展开更多
A multichannel noncoherent integration detection method based on high range resolution profile was presented in this paper. According to the property of the moment generating function, the distribution characteristics...A multichannel noncoherent integration detection method based on high range resolution profile was presented in this paper. According to the property of the moment generating function, the distribution characteristics of the noncoherent integrated signals with or without target presence were derived under the circumstance with noncorrelated Gaussian distribution noises. The loss of noncoherent integration was due to improper selection of integration range of cell numbers. A multi channel noncoherent integration detection scheme where the integration number in each channel va ries was proposed to solve this problem. The quality of this method for detection of various targets was evaluated. A comparison of fixed integration range cell number detection and multichannel inte gration detection for a high range resolution profile was presented. Simulation results indicated that the principle of the method was correct and performed well for unknown physical dimension targets. The method required little prior knowledge about target and was convenient for practical implementa tion.展开更多
传统的雷达高分辨距离像(High Resolution Range Profile,HRRP)序列识别方法依赖于人工提取特征,并且在使用现有的经典深度学习方法识别小数据集时存在梯度消失和过拟合问题,导致收敛速度慢,识别率低。针对上述问题,提出了一种基于注意...传统的雷达高分辨距离像(High Resolution Range Profile,HRRP)序列识别方法依赖于人工提取特征,并且在使用现有的经典深度学习方法识别小数据集时存在梯度消失和过拟合问题,导致收敛速度慢,识别率低。针对上述问题,提出了一种基于注意力机制的集成Inception网络模型,通过集成Attention-Inception单分支网络,实现了HRRP序列更深层次特征的提取;通过对模型的损失函数加入L2正则化,缓解小数据集在集成网络中的过拟合问题;利用Inception Ⅰ和Inception Ⅱ结构提取HRRP序列多尺度特征,并引入注意力机制计算特征序列的分配权重;加入残差结构,减缓了集成网络梯度消失问题。在预处理后的HRRP序列上进行实验结果表明,所提方法的目标识别率达到93.3%,并且与未去除噪声的HRRP序列相比目标识别率提高了14.67%。展开更多
给出了一种结合幂变换的高分辨率距离像 (High Resolution Range Profile,简称 HRRP)的预处理新方法。根据时域 -频域能量等价性 ,利用功率平均形成一种频域平均模板。基于美国 MSTAR(Moving and Stationary TargetAcquisition and Reco...给出了一种结合幂变换的高分辨率距离像 (High Resolution Range Profile,简称 HRRP)的预处理新方法。根据时域 -频域能量等价性 ,利用功率平均形成一种频域平均模板。基于美国 MSTAR(Moving and Stationary TargetAcquisition and Recognition)展开更多
在未发生散射点越距离单元走动(Moving Through Range Cell,MTRC)的角域内,闪烁现象是导致高分辨距离像(High Resolution Range Profile,HRRP)波动的主要原因。该文基于匹配度准则定量分析闪烁时HRRP常用谱特征(幅度谱、功率谱及高阶谱...在未发生散射点越距离单元走动(Moving Through Range Cell,MTRC)的角域内,闪烁现象是导致高分辨距离像(High Resolution Range Profile,HRRP)波动的主要原因。该文基于匹配度准则定量分析闪烁时HRRP常用谱特征(幅度谱、功率谱及高阶谱)的变化规律,比较各种谱特征受闪烁影响的强弱及原因,以获得定量的结论指导谱特征的选择。蒙特卡罗实验和暗室实测数据均表明:闪烁对HRRP谱特征的影响与闪烁散射点在目标能量中所占比重、闪烁区间的远近有关;除此之外,闪烁对高阶谱的影响还与高阶谱的阶数有关;常用谱特征中,功率谱受闪烁的影响最弱。展开更多
基金Supported by the National Natural Science Fundation of China(61001192)
文摘The approach to estimate the length of extended targets by using the bistatic high resolution range profile（ H RRP） is analyzed in this paper. The relationship between the bistatic H RRP and the monostatic H RRP of extended targets are investigated. It is demonstrated by simulations that the target length measured by the bistatic H RRP is more meaningful and accurate than that by the monostatic HRRP,though the monostatic H RRP has been well developed and widely used in target recognizing and classification. The estimation results of a cone shaped target are present and compared at the end of the paper. To assure the reliability of the simulation,the bistatic H RRP is obtained through the scattering field data calculated by a fullwave numerical method,FE-BI-MLFMA.
基金Supported by the Advanced Research Foundation of General Armament Department(51307020101)
文摘A multichannel noncoherent integration detection method based on high range resolution profile was presented in this paper. According to the property of the moment generating function, the distribution characteristics of the noncoherent integrated signals with or without target presence were derived under the circumstance with noncorrelated Gaussian distribution noises. The loss of noncoherent integration was due to improper selection of integration range of cell numbers. A multi channel noncoherent integration detection scheme where the integration number in each channel va ries was proposed to solve this problem. The quality of this method for detection of various targets was evaluated. A comparison of fixed integration range cell number detection and multichannel inte gration detection for a high range resolution profile was presented. Simulation results indicated that the principle of the method was correct and performed well for unknown physical dimension targets. The method required little prior knowledge about target and was convenient for practical implementa tion.
文摘给出了一种结合幂变换的高分辨率距离像 (High Resolution Range Profile,简称 HRRP)的预处理新方法。根据时域 -频域能量等价性 ,利用功率平均形成一种频域平均模板。基于美国 MSTAR(Moving and Stationary TargetAcquisition and Recognition)
文摘在未发生散射点越距离单元走动(Moving Through Range Cell,MTRC)的角域内,闪烁现象是导致高分辨距离像(High Resolution Range Profile,HRRP)波动的主要原因。该文基于匹配度准则定量分析闪烁时HRRP常用谱特征(幅度谱、功率谱及高阶谱)的变化规律,比较各种谱特征受闪烁影响的强弱及原因,以获得定量的结论指导谱特征的选择。蒙特卡罗实验和暗室实测数据均表明:闪烁对HRRP谱特征的影响与闪烁散射点在目标能量中所占比重、闪烁区间的远近有关;除此之外,闪烁对高阶谱的影响还与高阶谱的阶数有关;常用谱特征中,功率谱受闪烁的影响最弱。
