导航雷达在国民经济中有着广泛应用,多采用非相参体制且信号处理较简单,难以在强海杂波中发现微弱小目标。文中基于天线对小目标和大面积相关海杂波的不同调制效应,提出实时处理和非实时处理两种基于波束内脉间差分处理的导航雷达杂波抑制方法,在不改变现有导航雷达硬件系统的前提下,能够有效提高目标检测的信杂比。分析了所提两种处理方法的性能,在给定海杂波相关性模型的条件下推导了两种方法下信杂比改善因子的解析表达式。最后,使用实测数据进行检验,处理结果证明了所提方法的有效性。

Marine radars are widely utilized in our economy and society, which are mainly non-coherent and have simple signal processing units, and usually they are difficult to detect small targets in heavy sea clutter environment. Based on the different modulation effect caused by the antenna towards small target and distributed large sea clutter, two kind clutter suppressing methods which are called real鄄time method and non real time method using co鄄pluses difference methods are proposed in this paper. In the condition of not changing existing marine radar hardware system, the propose methods can effectively enhance the signal to clutter ratio for target detection. The performance of the propose methods were analyzed, and by giving the sea clutter model of corresponding ,the analytic expressions of the clutter-to-signal ratio in the condition of the two proposed methods was presented respectively. Finally, measured field data were used to validate the proposed methods.