一种高能量发射效率MIMO天波雷达方案

摘要

为提高阵元空间多输入多输出(Multiple-Input Multiple-Output,MIMO)天波超视距雷达(Over-The-Horizon Radar,OTHR)发射天线辐射能量效率,提出了降维分时波束空间MIMO-OTHR方案,并在该方案下实现了发射自适应波束形成.该方案降低了不可见波束区发射能量,无方向图起伏过大问题,发射自由度降低较少,适合在多径杂波个数较多的背景下应用,且只需要简单的波束控制,易于工程实现.理论分析和仿真实验验证了该方案的有效性.%To enhance transmitting power efficiency in element-space multiple-input multiple-output (MIMO) skywave over-the-horizon radars (OTHR),a reduced dimension time diverse beamspace MMO-OTHR scheme is proposed, and transmitting adaptive digital beamforming is realized under the scheme. With the new scheme, the stared power in invisible beamspace is decreased without acute fluctuations in beam pattern, and little reduction of degree of freedom makes MMO-OTHR be able to work under the situation that the number of multipath clutters is large. The new scheme needs only beam direction control,which simplifies the MIMO realization in OTHR.Theoretical analyses and simulation results both show that the presented scheme is effective.