MIMO雷达波束方向图及其旁瓣抑制方法

Beam pattern and side-lobe suppression based on MIMO radar

给出了多输入多输出(multiple-input multiple-output,MIMO)雷达波束方向图的数学表达式,它为发射和接收方向图的乘积。假设接收阵元为半波长配置,通过分析发射阵元的间隔配置,得出如下结论:当发射阵元为一倍或Mr(接收阵元数目)倍半波长间距时,波束方向图将不会产生高旁瓣;当发射阵元的间距介于两者之间时,波束方向图将会因发射端的栅瓣效应而造成高旁瓣电平。针对后者引起的高副瓣情况,提出了利用接收波束合成算法来对消发射阵元的栅瓣,进而有效地抑制旁瓣。仿真实验验证了理论分析的有效性。

The beam pattern of multiple-input multiple-output（MIMO） radar is derived analytically,which shows that it is the product of transmitter and receiver beam pattern.By assuming that the receiver inter-element is half-wavelength spacing,this paper analyzes the inter-element spacing of the transmitter,and gets the follow conclusion： when the transmitter inter-element is half-wavelength or Mr/2-wavelength spacing（Mr is the transmitter elements）,the beam pattern of MIMO radar cannot form the high side-lobe.And when the transmitter inter-element is between half-wavelength and Mr/2-wavelength spacing,the transmitter will form the grating lobe which leads to the high side-lobe in the beam pattern.Furthermore,in order to suppress the high side-lobe,a new pattern synthesis algorithm is used to cancel the grating lobe,which can suppress the side-lobe efficiently.Simulations verify theoretical analysis.