摘要
影响宽带线性调频雷达运动目标检测的两个核心问题是多周期脉冲间散射中心的越距离单元走动(MTRC)以及扩展目标在高分辨距离单元间的能量分散。在分析宽带线性调频脉冲串回波信号多普勒效应的基础上,将每个子脉冲回波经过逆滤波转化为窄带信号,通过窄带匹配滤波降低距离分辨率对多散射中心的能量进行相参积累,同时避免了越距离单元走动问题。然后利用脉冲多普勒思想对低分辨的脉冲串信号进行二次相参积累,实现运动目标检测(MTD)。最后通过仿真实验验证了算法的有效性,结果表明该算法对存在多个强散射中心和速度较大的目标能够有效提高相参积累信噪比和测速精度。
There are two key problems of moving target detection in wideband linear frequency-modula- ted（LFM） radar. One is the migration through resolution cetl（MTRC） of the scatter centers among the pulse trains, and the other is the energy spread of the target in the high resolution range cells. After analyzing the Doppler effect of wideband LFM echoes, we propose to perform inverse filter to each echo pulse and narrow- band matched filter in succession, which will integrate the energy of the scatter centers coherently and avoid the MTRC phenomenon as well. Then the pulse train of low resolution signal is accumulated again through pulse-Doppler processing, and the moving target detection can be achieved. Simulations are performed to ver- ify the algorithm, and the results demonstrate that this algorithm can improve the SNR and accuracy of veloc- ity measurement for the fast moving targets which have several scatter centers.
出处
《雷达科学与技术》
2012年第4期409-415,420,共8页
Radar Science and Technology
基金
国家自然科学基金委杰出青年基金(No.61025006)
关键词
逆滤波
线性调频信号
脉冲多普勒
动目标检测
越距离单元走动
inverse filter
linear frequency-modulation
pulse-Doppler
moving target detection
migra-tion through resolution cell
