基于时间调制的单通道多基线相位干涉仪测向  

Single-channel multiple baseline interferometer DF with time modulation

作　　者：赵自强 曹岸杰[1,2] 杨勇[2] 游月辉[2] 陈靖峰[1] 金荣洪[1] 贺冲[1] ZHAO Ziqiang;CAO Anjie;YANG Yong;YOU Yuehui;CHEN Jingfeng;JIN Ronghong;HE Chong(Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Satellite Institute,Shanghai 200230,China)

机构地区：[1]上海交通大学,上海200240 [2]上海卫星工程研究所,上海200230

出　　处：《电波科学学报》2023年第1期96-102,129,共8页Chinese Journal of Radio Science

基　　金：国家自然基金面上项目(62271317);上海市青年科技英才扬帆计划(20YF1447000)。

摘　　要：基于时间调制理论,提出了一种单通道框架下的多基线相位干涉仪测向方法,其克服了传统相位干涉需要多个射频通道带来的系统复杂度高以及通道幅相不一致性问题.所提方法利用单刀多掷开关周期性接通多基线相位干涉的各天线单元,并从接收信号产生的谐波特征中同时估计多组基线产生的相位差.首先分析传统多基线相位干涉仪测向存在的局限性,然后提出基于时间调制的单通道多基线相位测量方法,最后结合2~8GHz宽带测向需求,设计四基线相位干涉仪并进行仿真.仿真结果显示,在2~8 GHz范围内,测向误差能达到0.1°以内,证明了本文方法的有效性.This article proposed a direction-of-arrival(DOA) estimation method using multiple baseline phase interferometer in the framework of single channel based on time-modulated array(TMA) theory, which overcomes the problem of amplitude and phase inconsistency and system complexity caused by multiple radio frequency(RF) channels in traditional phase interferometer. The method proposed in this article uses single pole multi throw switch to turn on each antenna unit of multi baseline phase interferometer periodically, and estimate the phase differences, which is generated by multiple groups of baselines, from the harmonic characteristics generated by received signal. This article analyzes the limitations of traditional multi baseline phase interferometer in DOA estimation, and then proposed a method of single channel multi baseline phase measurement base on TMA theory. After that, a four-baseline phase interferometer is designed for simulation combined with the requirements of broadband direction finding(DF) in 2-8GHz. The result of simulation shows that the DF error can be reduced to lower than 0.1° in the range of 2-8 GHz,which indicates the effectiveness of the proposed method.

关 键 词：时间调制阵列 无线电测向 多基线相位干涉天线 虚拟基线 

分 类 号：TN821[电子电信—信息与通信工程]