使用嵌套阵列对一致宽带源的到达方向估计
Yawei Tang1, Weiming Deng1, Jianfeng Li1
1College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.
Sensors (Basel, Switzerland)
|August 12, 2023
概括
本研究引入了一种使用稀疏数组来估计到达方向 (DOA) 的新方法,有效处理连贯的宽带信号. 该方法显著提高了准确性,在模拟和现实世界的测试中表现优于现有技术.
科学领域:
- 阵列信号处理 阵列信号处理
- 电磁和射频工程 电磁和射频工程
背景情况:
- 稀疏数组,如嵌套和副prime数组,提供高的DOA估计准确性和自由度 (DOF).
- 稀疏数组的一个关键局限性是它们与连贯宽带信号的斗争,这是由于信号独立的假设,在复杂的环境中通常会受到侵犯.
研究的目的:
- 开发一种强大的DOA估计方法,用于能够处理连贯宽带信号的稀疏数组.
- 在处理信号相关性时克服传统稀疏阵列方法的局限性.
主要方法:
- 在没有预估的情况下利用连贯信号子空间方法 (CSSM) 进行宽带信号聚焦和对比.
- 虚拟化稀疏数组后去相关性的共变矩阵.
- 应用一个增强的空间平滑算法来最大限度地利用数据共变矩阵并改善对比度.
- 使用多重信号分类 (MUSIC) 算法进行最终的DOA估计.
主要成果:
- 拟议的算法在模拟中表现出令人满意的性能,根平均平方误差 (RMSE) 与信号对噪声比 (SNR) 有所不同.
- 与最先进的方法相比,取得了更好的结果,包括传统的不连贯信号子空间方法 (ISSM),CSSM和空间平滑算法.
- 通过真实数据测试验证,达到仅为0.2度的低误差,优于现有方法.
结论:
- 开发的方法有效地解决了DOA估计的挑战,在稀疏的数组中提供连贯的宽带信号.
- 该技术在实际场景中为到达方向估计的准确性和稳定性提供了显著的改进.
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