Height measurement method of monostatic metre wave multiple input multiple output radar based on coprime array
Height measurement method of monostatic metre wave multiple input multiple output radar based on coprime array
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DOI：
10.1049/sil2.12121
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
Hongzhen Wang;Guimei Zheng;Yuwei Song
中科院分区：
文献类型：
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作者：
Hongzhen Wang;Guimei Zheng;Yuwei Song
基于均匀线阵的米波多输入多输出（MIMO）雷达测高算法存在对超低空目标测角精度急剧下降、测高随仰角变化波动大等问题。为了解决上述难题，从阵列结构减小多径效应影响的角度出发，将互质阵列（CPA）应用于单基地米波MIMO雷达测高。建立了平地条件下单基地CPA米波MIMO雷达的信号模型，在推导出虚拟阵列法测高不可行的基础上，提出了一种利用物理阵列的测高方法，填补了基于稀疏阵列米波MIMO雷达低仰角估计方法的差距。该方法根据CPA导向矢量的特点计算回波数据，然后利用广义多信号分类算法得到精确的低仰角，最后利用几何关系得到目标高度。仿真实验比较了三种典型的CPA与等阵元的双馈阵，验证了基于CPA的单基地米波MIMO雷达测高性能的优越性和所提方法的有效性。
The height measurement algorithm of metre wave multiple input multiple output (MIMO) radar based on uniform linear array (ULA) has some problems, such as a sharp decline of angle measurement accuracy of ultra‐low altitude targets and large fluctuation of height measurement with the change of elevation. In order to solve the above difficult problems, starting from the perspective of reducing the influence of multipath effect by array structure, coprime array (CPA) is applied to the height measurement of monostatic metre wave MIMO radar. In this paper, the signal model of monostatic CPA metre wave MIMO radar is established under the condition of flat ground, a height measurement method using physical array is proposed based on the derivation that it is infeasible to use virtual array method for height measurement, it fills the gap of low elevation estimation method based on sparse array metre wave MIMO radar. The proposed method calculates the echo data according to the characteristics of the steering vector of CPA, then obtains the accurate low elevation by using the generalised multiple signal classification algorithm, and finally the target height is obtained by using the geometric relationship. Simulation experiments compare three typical CPAs with ULA using equal array elements, and verify the superiority of height measurement performance of monostatic metre wave MIMO radar based on CPA and the effectiveness of the proposed method.