Application of Frequency Diversity to Suppress Grating Lobes in Coherent MIMO Radar with Separated Subapertures
Application of Frequency Diversity to Suppress Grating Lobes in Coherent MIMO Radar with Separated Subapertures
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DOI：
10.1155/2009/481792
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发表时间：
2009
影响因子：
1.9
通讯作者：
Long Zhuang;Xingzhao Liu
中科院分区：
文献类型：
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作者：
Long Zhuang;Xingzhao Liu
提出了一种基于频率分集的分离子孔径相干MIMO雷达栅瓣抑制方法。通过从分离的子孔径或子阵列发射正交波形，可以在接收端形成具有相同主瓣方向的接收波束。然而，如果辐射波形的频率从子阵列到子阵列增加频率偏移，则栅瓣将改变到不同的位置。相干地组合光束可以将栅瓣抑制或平均到低水平。我们表明，由此产生的发射-接收波束图是由距离相关的发射波束和组合的接收波束。结果表明，距离相关的发射波束也可以是频率偏移相关的。通过适当地选择一组，可以实现将发射光束精确地引导到具有已知范围和已知角度的目标。通过仿真对不同的选择方案的抑制效果进行了评价和研究。
A method based on frequency diversity to suppress grating lobes in coherent MIMO radar with separated subapertures is proposed. By transmitting orthogonal waveforms from separated subapertures or subarrays, receiving beams can be formed at the receiving end with the same mainlobe direction. However, grating lobes would change to different positions if the frequencies of the radiated waveforms are incremented by a frequency offset from subarray to subarray. Coherently combining the beams can suppress or average grating lobes to a low level. We show that the resultant transmit-receive beampattern is composed of the range-dependent transmitting beam and the combined receiving beam. It is demonstrated that the range-dependent transmitting beam can also be frequency offset-dependent. Precisely directing the transmitting beam to a target with a known range and a known angle can be achieved by properly selecting a set of . The suppression effects of different schemes of selecting are evaluated and studied by simulation.