用射电干涉阵列低成本实时估算信号来向，无需成像。
Polarization based direction of arrival estimation using a radio interferometric array
- 基于极化特性设计新算法，适配任意几何布局的阵列
- 仅需全阵列部分数据即可实现早期来向估计
- 适合瞬态信号和低占空比源检测，可做射频干扰定位
到达方向（DOA）估计通常依赖于为特定频段精心设计的接收器间距与布局。而射电干涉阵列的设计目标是高效采样傅里叶空间数据以生成高质量天图。因此，传统上难以利用具有任意几何结构和宽频变范围的射电干涉阵列进行DOA估计，除非通过其生成的图像。本文提出一种无需成像、低成本的DOA估计方法，仅使用阵列子集和全阵列的少量数据，实现早期来向判定。该方法特别适用于瞬态信号和低占空比源的检测；同时，它可作为在线射频干扰（RFI）抑制后的后续步骤，实现对已检测干扰信号的快速来向估计。
原文摘要 · Abstract (English)
Direction of arrival (DOA) estimation is mostly performed using specialized arrays that have carefully designed receiver spacing and layouts to match the operating frequency range. In contrast, radio interferometric arrays are designed to optimally sample the Fourier space data for making high quality images of the sky. Therefore, using existing radio interferometric arrays (with arbitrary geometry and wide frequency variation) for DOA estimation is practically infeasible except by using images made by such interferometers. In this paper, we focus on low cost DOA estimation without imaging, using a subset of a radio interferometric array, using a fraction of the data collected by the full array, and, enabling early determination of DOAs. The proposed method is suitable for transient and low duty cycle source detection. Moreover, the proposed method is an ideal follow-up step to online radio frequency interference (RFI) mitigation, enabling the early estimation of the DOA of the detected RFI.
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