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多输入多输出(MIMO)天波超视距雷达(OTHR)技术在雷达发射端发射低增益宽波束,在接收端进行波束形成得到高增益的窄波束,可以满足多层电离层探测和杂波抑制的需求。该文将两层电离层结构应用到MIMO-OTHR中,并针对OTHR杂噪比(CNR)比较高的特点,提出一种互信息理论方法对发射波形进行自适应优化。仿真结果表明该方法明显提升了目标距离分辨率和检测概率,说明在MIMO-OTHR中,经过合理的波形优化,可以利用多径回波改善雷达系统性能。
Multiple-input multiple-output (MIMO) sky-wave OTHR technology emits low-gain wide beams at the radar transmitter and beam-forming at the receiver to obtain high-gain narrow beams that can satisfy multi-layer ionospheric detection and clutter suppression The demand. In this paper, two layers of ionosphere structure are applied to MIMO-OTHR. Aiming at the relatively high OTHR ratio (CNR), a mutual information theory method is proposed to optimize the transmit waveform adaptively. The simulation results show that this method obviously improves the target distance resolution and detection probability, which shows that the multipath echoes can improve the radar system performance in MIMO-OTHR through reasonable waveform optimization.