一种改善导航雷达恒虚警检测效果的算法

传统的恒虚警检测器在进行目标检测时,容易受到其他目标和强海杂波的干扰,造成自遮蔽效应,使得大目标和大块地物（陆地、岛屿）回波出现“挖空”现象.通过自适应调整参考单元与保护单元的设置以适应不同的检测环境,在理论上可以有效克服“挖空”现象,但是这种自适应技术在实际雷达中很难应用.针对这种“挖空”现象,以某型导航雷达为例,利用陆地（或岛屿）杂波和大目标在幅度上与海杂波回波的差异对一定范围内的数据进行修复,最后基于导航雷达的实测数据对文中算法进行验证,结果表明,该算法明显改善了导航雷达的回波显示质量,有利于目标的凝聚与跟踪,且运算量适中,便于工程实现.

An Algorithm to Improve Navigation Radar Display Effect after CFAR Detection

When detecting target,the performance of CFAR detector is affected in homogeneous and multiple targets background,which results in self-shadowing effect.Then the hollowing appears in the ground（island） clutter echoes.This phenomenon can be overcome by adjusting reference units and protecting units adaptively.But the adaptive technique is hardly applied in actual radar system.Based on a navigation radar,the range differences between targets and sea clutter echos are utilized to repair echo data in a certain area.The algorithm is vertified by use of real navigation radar data.Results show that the scheme improves display quality of the navigation radar and it is favor of cohesion and tracking.The algorithm can be easily realized and the computational amount is moderate.