基于斜投影算子的高频雷达窄波束形成方法  

Narrow beam forming method for high frequency radar based on oblique projection operator

作　　者：王祎鸣[1,2] 毛兴鹏[1] 洪泓[1] 邓维波[1] 张杰[2] 

机构地区：[1]哈尔滨工业大学,哈尔滨150001 [2]国家海洋局第一海洋研究所,青岛266061

出　　处：《电波科学学报》2015年第5期857-863,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(61171180);基本科研专项资金团队项目(2013T03);海洋公益性科研专项(200905029)

摘　　要：波束形成是高频雷达等系统分辨目标方位以及抗干扰的有效手段,常规的波束形成依赖增加阵列孔径实现更窄的波束.提出了一种不受阵列孔径限制的窄波束形成方法,该方法利用斜投影的零相移以及在干扰方向形成的深零陷,通过对宽波束方位内的干扰并行多次抑制,在波束指向周围形成零陷,合成输出窄波束.与传统波束形成相比,本方法具有波束宽度窄、旁瓣抑制比高的特点,尤其是小阵列孔径情况下仍可实现窄波束形成.经高频地波雷达距离-多普勒域实测数据的验证,表明该方法能够实现宽波束内目标的超分辨,并且剔除窄波束以外的电离层杂波,实现了常规波束内的杂波抑制和更为精细的方位分辨.Spatial filtering is a valid approach to distinguish targets and suppress interferences.Conventional beam forming method relies on the increase of array aperture to form narrower beam.To improve the azimuth resolution without increasing the array aperture,a novel narrow beam forming method is proposed.By using zero phase-shift and deep nulls in the interference directions of oblique projection,multiple parallel spatial filters are constructed to suppress the interferences within the conventional beam.Therefore,the nulls are formed around beam direction and a narrower beam can be obtained by composing all the filter outputs.Compared with the traditional beam forming method,the method proposed is able to reduce the beam width significantly and improves the side lobe suppression ratio simultaneously.Especially,a narrower beam can still be formed when the array aperture is small.Experimental results of range-Doppler spectrum of high frequency radar demonstrate that,this narrow beam forming method can realize supper resolution of the target within the wide beam,and suppress the iono-spheric clutter beyond the narrow beam formed,which achieve interference suppression within conventional beam and improved azimuth resolution of high frequency radar.

关 键 词：波束形成 斜投影 高频雷达 距离-多普勒域 

分 类 号：TN911.7[电子电信—通信与信息系统]