Detection of high-speed and accelerated target based on the linear frequency modulation radar
Detection of high-speed and accelerated target based on the linear frequency modulation radar
复制标题
基于线性调频雷达的高速加速目标检测
DOI：
10.1049/iet-rsn.2013.0001
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发表时间：
2014-01-01
影响因子：
1.7
通讯作者：
Nan, Zhang
中科院分区：
文献类型：
--
作者：
Pang, Cunsuo;Shan, Tao;Nan, Zhang
目标的高速运动会引起雷达回波的距离徙动和多普勒频移，严重影响雷达的检测性能。针对线性调频雷达对高速目标的检测问题，分析了距离徙动和多普勒频率徙动对积分增益的影响，并根据回波信号输入信噪比的不同，提出了相应的补偿方法。为了补偿高信噪比下的距离徙动，结合二维中值滤波和恒虚警技术进行速度估计。对于低信噪比，在粗估值的基础上，采用离散傅里叶变换（DFT）实现分数延迟单元，以提高速度精度。此外，为了补偿多普勒频移，提出了一种适用于高信噪比的瞬时互相关方法，并结合分数阶傅里叶变换方法对低信噪比下的加速度进行估计。最后利用仿真数据对不同算法的输入信噪比门限进行了分析，给出了理论参考值。最后通过仿真和实测数据验证了所提方法的有效性。
The high-speed movement of a target may cause range migration and Doppler frequency migration of the radar echo, which has a serious impact on the detection performance of the radar. To resolve the problem of detecting a high-speed target in linear frequency modulation radar, this study analyses the effect on the integration gain caused by range migration and Doppler frequency migration, and proposes a corresponding compensation method according to the different input signal-to-noise ratios (SNRs) of the echo signal. To compensate for range migration in high SNRs, two-dimensional median filtering and constant false alarm rate technology are combined to estimate the speed. For low SNRs, based on coarse valuations, the authors use the discrete Fourier transformation (DFT) to realise the fractional delay cell to improve speed accuracy. Furthermore, to compensate for Doppler frequency migration, an instantaneous cross-correlation method is proposed for high SNRs, which is combined with the fractional Fourier transform method to estimate the acceleration for low SNRs. The input SNR threshold for the different algorithms is then analysed using simulation data, and the theoretical reference value is shown. Finally, the study verifies the effectiveness of the proposed methods through simulation and measured data.