基于多通道探测的场向不均匀体定位方法  

Field-aligned Irregularities Localization Based on Multi-channel Detection

作　　者：唐志坤 龚晚林 TANG Zhikun;GONG Wanlin(Electronic Information School,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430072

出　　处：《探测与控制学报》2022年第5期39-45,共7页Journal of Detection & Control

摘　　要：甚高频雷达对场向不均匀体探测存在无法实现空间定位,旁瓣回波无法区分等问题,为解决上述问题,实现富克甚高频雷达对场向不均匀体的空间定位,对富克甚高频雷达进行了相关升级改造,在原有阵列基础上新建造两个子阵列使富克甚高频雷达具有多通道探测能力。利用多通道探测数据,进行快速傅里叶变换、互相关后选取互相关系数满足条件的点求出测量相位差,并根据电离层场向不均匀体的场向特性,对测量相位差进行相位解模糊与初始相位校正,得到实际相位差。通过实际相位差与阵列间的位置关系计算出回波区域在空间中的位置,最终得到电离层场向不均匀体的空间结构与位置。实测结果表明,该方法能够正确对场向不均匀体定位,且新增相位解模糊过程有效的实现了主瓣回波与旁瓣回波的区分,扩宽了定位区域。Due to the problems that VHF radar can not achieve spatial positioning and distinguish the sidelobe echo in the detection of field-aligned irregularities,in order to solve the above problems,realize spatial positioning of the Fuke VHF radar to the field-aligned irregularities,the upgrade of Fuke VHF radar was completed.Two new sub-arrays were built to enable the Fuke VHF radar to have multi-array and multi-channel detection capabilities.Using the multi-channel detection data,after fast Fourier transform and cross-correlation,the points were selected to obtain the phase difference,in which cross-correlation coefficient satisfies the coditions by using the field-aligned characteristics of ionospheric field aligned irregularities to unwrapping phase ambiguity and calibrating initial phase bias of measure phase difference,which obtained actual phase difference.The spatial position of echo region was calculated by the phase difference and positional relationship between the arrays,and spatial structure and location of ionospheric field-aligned irregularities was obtained.Observation results showed that it could correctly locate filed aligned irregularities,the unwrapping phase ambiguity process effectively distinguished the mainlobe and sidelobe echo,and broaden positioning area.

关 键 词：空间干涉法 甚高频雷达 旁瓣回波 相位解模糊 场向不均匀体 

分 类 号：TN958.92[电子电信—信号与信息处理]