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一种基于迭代自适应的离网格DOA估计方法

揭允康 张雯 李想 叶晓东 王昊 陶诗飞

揭允康, 张雯, 李想, 叶晓东, 王昊, 陶诗飞. 一种基于迭代自适应的离网格DOA估计方法[J]. 电子与信息学报. doi: 10.11999/JEIT221061
引用本文: 揭允康, 张雯, 李想, 叶晓东, 王昊, 陶诗飞. 一种基于迭代自适应的离网格DOA估计方法[J]. 电子与信息学报. doi: 10.11999/JEIT221061
JIE Yunkang, ZHANG Wen, LI Xiang, YE Xiaodong, WANG Hao, TAO Shifei. An Off-Grid DOA Estimation Based on Iterative Adaptive Approach[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT221061
Citation: JIE Yunkang, ZHANG Wen, LI Xiang, YE Xiaodong, WANG Hao, TAO Shifei. An Off-Grid DOA Estimation Based on Iterative Adaptive Approach[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT221061

一种基于迭代自适应的离网格DOA估计方法

doi: 10.11999/JEIT221061
基金项目: 国家重点研发计划(2021YFB3502500)
详细信息
    作者简介:

    揭允康:男,博士生,研究方向为稀疏阵列信号处理、DOA估计

    张雯:女,硕士生,研究方向为阵列信号处理

    李想:女,助理研究员,研究方向为电子信号侦查技术

    叶晓东:男,副教授,研究方向为通信理论与技术、随机信号理论与应用、信号获取与处理、现代信号处理

    王昊:男,教授,研究方向为数字波束形成天线系统、多功能雷达天线系统、新型通信天线系统

    陶诗飞:男,副研究员,研究方向为雷达目标特性分析、雷达成像及信号处理、计算电磁学

    通讯作者:

    陶诗飞 s.tao@njust.edu.cn

  • 中图分类号: TN97

An Off-Grid DOA Estimation Based on Iterative Adaptive Approach

Funds: The National Key Research and Development Program (2021YFB3502500)
  • 摘要: 针对真实信源位置与字典网格不匹配导致波达角估计(DOA)误差过大的问题,该文提出了一种基于修正迭代自适应(IAA)功率谱算法的离网格(Off-Grid)DOA估计方法(OGIAA)。该方法首先通过修正IAA方法得到信号功率谱,读出功率峰值的对应网格角度作为粗估计结果,再利用平方误差代价函数,将代价函数二阶泰勒展开并最小化得到初始偏移量,最后交替优化功率分量和偏移量,实现高精度的离网格DOA估计。理论分析和仿真结果表明,该方法实现过程简单,无正则化参数影响,能准确估计出偏移网格的信源角度,在高阵列自由度的非均匀阵列上也同样具备高估计精度。
  • 图  1  不同参数条件下的估计正确率

    图  2  不同算法在空域网格上的幅度对比图

    图  3  不同快拍数和信噪比下的算法估计精度

    图  4  互质阵列结构

    图  5  互质虚拟阵估计结果

    图  6  不同快拍数和信噪比下的算法估计精度

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出版历程
  • 收稿日期:  2022-08-12
  • 录用日期:  2023-01-11
  • 修回日期:  2022-12-22
  • 网络出版日期:  2022-01-14

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