一种子阵级数字合成波束的远场简易校正方法  

A Simple Calibration Method Based on Far Field for Subarray Digital Receive Beam Forming

作　　者：董锦[1] 相飞[1] 雷亚龙[1] 王海涛[1] DONG Jin;XIANG Fei;LEI Yalong;WANG Haitao(Xi＇an Electronic Engineering Institute,Xi＇an 710100,China)

机构地区：[1]西安电子工程研究所,陕西西安710100

出　　处：《电子科技》2018年第12期43-46,51,共5页Electronic Science and Technology

基　　金：陆军航空装备"十三五"预研专用技术项目(30104010304)

摘　　要：针对有源相控阵雷达子阵级数字波束合成时,接收通道幅相不一致导致数字天线方向图指标恶化的问题,文中提出了一种远场测试条件下的简易通道校正方法,通过对方位和俯仰两维空间解耦,采用动态调整步长的快速搜索迭代算法,在数字下变频后的视频域进行系统通道响应标定。实验结果表明,校正后的数字天线方向图主副瓣比将近25d B,证明了该方法的有效性。该方法降低了测试的难度和复杂度,具有简单、高效的特点,并具有一定的工程实用价值。Aiming at the problem that the interchannel mismatch can severely degrade the performance of digital antenna pattern of active phased array radar for digital receive beam forming at subanay level. A simple calibration method based on far field was described in this paper. By decoupling the two dimensions of azimuth and pitching, a last search iteration algorithm with dynamic step size was adopted to calibrate the system channel in the video frequen- cy domain alter digital down conversion. The experiment results showed that the perfomlance of the digital antenna pattern calibrated could reach 25 dB, proving the ettectiveness of the method. This method reduced the difficulty and complexity of the test, indicating its simplicity, high efficiency and practical value of engineering.

关 键 词：子阵级 数字波束合成 通道不一致 数字天线方向图 远场测试 通道校正 

分 类 号：TN957.2[电子电信—信号与信息处理]