稀疏阵列在车载毫米波雷达中的应用

Application of Sparse Array in Automobile Millimeter Wave Radar

为了提升车载毫米波雷达的测角性能,通常需要增加雷达收发天线的物理口径。在天线物理通道资源有限的情况下,只能通过增加相邻天线的间距来提升整个天线系统的物理口径,这样虽然可以显著地提升雷达的测角性能,但是会产生多个栅瓣,最终造成角度模糊的问题。本文针对雷达测角模糊的问题,从调整收发天线间距的角度入手,采用了稀疏阵列的方法,并且针对该天线布局展开了相应的仿真计算。计算结果表明,该布局方法不仅有效增加了天线的物理口径,还能够在探测范围内消除。

In order to improve the perfbmiance of millimeter wave radar angle measurement,it is necessary to increase the physical aperture of the radar antenna system,while the antenna physical channel resource limited,increasing the distance between adjacent antennas is only way.Although it can improve significantly the performance of millimeter wave radar angle measurement,but it will product some grating lobes and cause angle ambiguity.In order to solve the problem,the distance of transmit and receive antenna has been adjusted compared to the conventional distance.The sparse array has been applied in antenna layout and corresponding simulation has also been completed.The result shows that the antenna layout can increase effectively the antenna aperture and also reduce the grating lobes in field of view.