Complex targets are irradiated by UWB radar, not only the mirror scattering echoes but also the multiscattering interacting echoes are included in target echoes. These two echoes can not be distinguished by classical ...Complex targets are irradiated by UWB radar, not only the mirror scattering echoes but also the multiscattering interacting echoes are included in target echoes. These two echoes can not be distinguished by classical frequency spectrum and power spectrurm. Time-domain bispectrum features of UWB radar signals that mingled with noise are analyzed, then processing this kind of signal using the method of time-domain bispectrum is experimented. At last, some UW-B radar returns with different signal noise ratio are simulated using the method of time-domain bispectrum Theoretical analysis and the results of simulation show that the method of extraction partial features of UWB radar targets based on time-domain bispectrum is good, and target classification and recognition can be implemented using those features.展开更多
Performance of traditional adaptive line enhancer （ALE） in suppressing Gaussian noise is low and can get worse at low input signal-to-noise ratio（SNR）. For greatly overcoming these disadvantages, feature of fourth...Performance of traditional adaptive line enhancer （ALE） in suppressing Gaussian noise is low and can get worse at low input signal-to-noise ratio（SNR）. For greatly overcoming these disadvantages, feature of fourth-order cumulant （FOC） different slices for quasi-stationary random process is analyzed, fourth order cumulant（FOC） different slice-based adaptive dynamic line enhancer is presented, and output SNR of the proposed enhancer is derived and bigger than that of the ALE via theoretical analysis. Simulation tests with the underwater moving target-radiated data have shown that the proposed enhancer outperforms the ALE in suppressing Gaussian noise and enhancing dynamic line spectrum feature.展开更多
激光主动成像技术是一种将激光技术、成像传感器技术以及图像处理技术结合在一起而发展起来的新技术。介绍了激光主动成像系统的组成,分析了激光图像的特点。为了抑制图像中存在的散斑噪声,采用加权均值多方向形态滤波算法进行图像预处...激光主动成像技术是一种将激光技术、成像传感器技术以及图像处理技术结合在一起而发展起来的新技术。介绍了激光主动成像系统的组成,分析了激光图像的特点。为了抑制图像中存在的散斑噪声,采用加权均值多方向形态滤波算法进行图像预处理;利用基于高阶统计量的算法把目标从高斯噪声中检测出来。研究了目标检测与处理的数字信号处理（digital signal processing,DSP）实时实现技术。实验结果表明：对于视频图像序列,系统能够实现运动目标的实时检测与跟踪。展开更多
基金This work was supported in part by National Defence Science and Technology Foundation (413220402)
文摘Complex targets are irradiated by UWB radar, not only the mirror scattering echoes but also the multiscattering interacting echoes are included in target echoes. These two echoes can not be distinguished by classical frequency spectrum and power spectrurm. Time-domain bispectrum features of UWB radar signals that mingled with noise are analyzed, then processing this kind of signal using the method of time-domain bispectrum is experimented. At last, some UW-B radar returns with different signal noise ratio are simulated using the method of time-domain bispectrum Theoretical analysis and the results of simulation show that the method of extraction partial features of UWB radar targets based on time-domain bispectrum is good, and target classification and recognition can be implemented using those features.
文摘Performance of traditional adaptive line enhancer （ALE） in suppressing Gaussian noise is low and can get worse at low input signal-to-noise ratio（SNR）. For greatly overcoming these disadvantages, feature of fourth-order cumulant （FOC） different slices for quasi-stationary random process is analyzed, fourth order cumulant（FOC） different slice-based adaptive dynamic line enhancer is presented, and output SNR of the proposed enhancer is derived and bigger than that of the ALE via theoretical analysis. Simulation tests with the underwater moving target-radiated data have shown that the proposed enhancer outperforms the ALE in suppressing Gaussian noise and enhancing dynamic line spectrum feature.
文摘激光主动成像技术是一种将激光技术、成像传感器技术以及图像处理技术结合在一起而发展起来的新技术。介绍了激光主动成像系统的组成,分析了激光图像的特点。为了抑制图像中存在的散斑噪声,采用加权均值多方向形态滤波算法进行图像预处理;利用基于高阶统计量的算法把目标从高斯噪声中检测出来。研究了目标检测与处理的数字信号处理（digital signal processing,DSP）实时实现技术。实验结果表明：对于视频图像序列,系统能够实现运动目标的实时检测与跟踪。
