High-speed multi-target detection with narrowband radar
High-speed multi-target detection with narrowband radar
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DOI：
10.1049/iet-rsn.2008.0160
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发表时间：
2010-08-01
影响因子：
1.7
通讯作者：
Bao, Z.
中科院分区：
文献类型：
--
作者：
Su, J.;Xing, M.;Bao, Z.
高速多目标检测是雷达应用中的一个具有挑战性的问题。通常情况下，高速目标在观测周期内会经过多个距离单元，这使得目标检测时很难获得每个目标的相干累积功率。在这项研究中，新的多目标检测与窄带雷达系统提出。为了消除距离徙动并获得目标能量的相干积累，对运动目标进行Keystone变换。但是，由于目标速度较高，雷达脉冲重复频率较低，会产生相位模糊，从而无法对距离徙动进行正确的校正。然后对第k个目标的相位模糊函数进行补偿，使第k个目标的包络集中在某个距离单元内。然后进行调频速率搜索，补偿二次相位项，最后通过FT分析对信号能量进行相干累加。如果峰值与噪声的比率高于预定阈值，则检测到目标。对于低信噪比（SNR）下的目标检测，采用Clean技术。通过仿真和雷达实测数据验证了该算法的有效性。
High-speed multi-target detection is a challenging problem in radar applications. Typically, targets with high speed go through several range cells in the observation period, which makes it more difficult to obtain each target's power coherently accumulated for target detection. In this study, novel multi-target detection with a narrowband radar system is proposed. In order to remove range migration and obtain coherent integration of the target energy, the Keystone transform is applied to the moving targets. However, because of the high target velocity and the low radar pulse repetition frequency phase ambiguity will occur, so the range migration will not be corrected properly. Then the phase ambiguity function of the kth target is compensated, and the envelope of the kth target concentrates in a certain range cell. Following by frequency modulation rate search a quadratic phase term is compensated, and the signal energy is finally coherently accumulated by FT analysis. The target is detected if the ratio of peak value to noise is higher than a predetermined threshold. For target detection in low signal-to-noise ratio (SNR), the Clean technique is applied. The proposed algorithm is verified by simulation and raw radar data results.