船载高频地波雷达一阶海杂波仿真模型研究

Research on Simulation Model of First-Order Sea Clutter for Shipborne High Frequency Ground Wave Radar

船载高频地波雷达(High Frequency Surface Wave Radar, HFSWR)海杂波仿真模型的建立对于有效海杂波抑制方法的提出具有重要指导意义。针对目前一阶海杂波模型存在的问题,提出了改进的船载HFSWR一阶海杂波空时分布模型。首先分析了船载平台在相参积累周期内前向运动对海杂波回波入射角的影响,提出了不同距离元海杂波子块入射角随时间变化的规律,并由此导出新的一阶海杂波时空分布模型、海杂波回波信号模型、以及目标回波模型。仿真结果表明,生成的海杂波数据的分布特性比传统模型更加接近实测海杂波的分布特性,为以后船载HFSWR海杂波有效抑制算法的研究提供较好的仿真数据支持。

The simulation model of sea clutter of shipborne High Frequency Surface Wave Radar(HFSWR) has important guidance for development of effective sea clutter suppression methods. Focusing on the defect of the existing first-order sea clutter simulation model, this paper proposes an improved first-order sea clutter space-time distribution model of shipborne HFSWR. Firstly, the effect of forward motion of ship platform on the incidence angle of a sea clutter patch echo during the coherent accumulation period was analyzed, and the law of the incidence angle change of a sea clutter patch at different range of cells was proposed. Then, based on this law, the improved first-order sea clutter time-space distribution model, the sea clutter echo signal model, and the target echo model were developed accordingly. The simulation experimental results show that the distribution characteristics of the sea clutter data generated in this paper are closer to the distribution characteristics of the measured sea clutter than the traditional model, thereby providing a better data support for development of effective sea clutter suppressing algorithm of shipborne HFSWR in the future.