高频地波雷达海流探测中一阶谱区分离方法  

Separation of First-Order Spectral Region in Detecting Ocean Current With HFSWR

作　　者：梅晓东[1,2] 纪永刚 王祎鸣[2,3] 唐庆乐[2] 

机构地区：[1]中国石油大学(华东),山东青岛266580 [2]国家海洋局第一海洋研究所,山东青岛266061 [3]国家海洋局航天科技集团公司海洋遥测工程技术研究中心,山东青岛266061

出　　处：《海洋科学进展》2014年第1期99-106,共8页Advances in Marine Science

基　　金：国家自然科学基金重点项目--高频天波/地波集成技术非协作目标信息获取与处理(61032011)

摘　　要：准确分离雷达回波中一阶谱区是高频地波雷达海流探测的关键环节,直接影响海流探测的精度。提出一种基于信噪比的一阶谱区分离方法,利用高频雷达数据中一阶回波谱平均幅度明显高于周边平均噪声的特点,通过确定特定宽度一阶谱与周边噪声的信噪比的极值来分离一阶谱区。将该方法应用于实测地波雷达回波数据,并与差谱法结果进行比对分析,结果表明基于信噪比的一阶谱分离方法能有效避免谱峰内部分裂及硬目标回波的影响。另外,进一步分析了方法中噪声窗和信号窗比值k对一阶谱区分离结果的影响,结果发现k值对一阶谱区分离结果的影响很小,实际处理中可取值0.5。An accurate separation of first-order spectral region from radar echoes, which may directly influ-ence the accuracy of ocean current detection, is an essential and important step in detecting ocean current with HFSWR. A SNR method is therefore proposed for the separation of first-order spectral region based on the characteristics that the amplitudes of the first-order spectra are sufficiently higher than those of the noises around. With this method, the first-order spectral region can be separated by the maximal SNR be-tween the first order-spectra and the noises around. This method has been applied to the measured HF-SWR data and compared with the differential spectrum method. The results indicate that the SNR method can effectively avoid the influences of the inner-peak split and the hard target echoes. By the further analy-sis of the ratio k of noise window to signal window, it is found that the value of k has little impact on the separation results. In the practice, k can be set to 0.5 in most cases.

关 键 词：高频地波雷达 一阶谱区分离 信噪比方法 实测数据处理 对比分析 

分 类 号：TN958.93[电子电信—信号与信息处理] TP751[电子电信—信息与通信工程]