多输入多输出阵列目标方位估计方法

提出了一种主动阵列目标定向空时编码新构型,即多输入多输出(multi-input multi-output,MIMO)阵列。MIMO阵列发射不相关信号(正交信号),扫描向量是常规相控阵发射扫描向量与接收扫描向量的卷积,从而产生了虚拟阵元,扩展了阵列孔径,形成的波束图是常规发射阵波束图与接收阵波束图的乘积,因此主瓣更窄,旁瓣更低。两目标高分辨统计性能的仿真分析和实验研究表明,与常规相控阵相比,MIMO阵列具有更高的目标角度分辨率和检测性能。

Target DOA estimation method using MIMO array

A new space-time coding configuration for target direction finding by active arrays called multi-input multi-output(MIMO) arrays is proposed.Multiple mutually uncorrelated(orthogonal) probing signals are transmitted by MIMO arrays whose steering vectors are the convolution of transmit and receive steering vectors of conventional phased arrays,which is essentially equivalent to extending the array aperture by additional virtual sensors.These virtual sensors can be used to form narrower beams with lower sidelobes because the MIMO array beam pattern is the product of the transmit beam pattern and the receive beam pattern.The minimum variance distortionless response(MVDR) method for direction of arrival(DOA) is studied,and simulations and experiments show that the MIMO array can achieve better performance in target detection and angular resolution over the conventional phased arrays.