Snapshot averaged Matrix Pencil Method (SAM) for direction of arrival estimation

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Experimental Astronomy Pub Date : 2023-06-28 DOI:10.1007/s10686-023-09897-6

Harsha Avinash Tanti, Abhirup Datta, S. Ananthakrishnan

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Abstract

The estimation of the direction of electromagnetic (EM) waves from a radio source using electrically short antennas is one of the challenging problems in the field of radio astronomy. In this paper we have developed an algorithm which performs better in direction and polarization estimations than the existing algorithms. Our proposed algorithm Snapshot Averaged Matrix Pencil Method (SAM) is a modification to the existing Matrix Pencil Method (MPM) based Direction of Arrival (DoA) algorithm. In general, MPM estimates DoA of the incoherent EM waves in the spectra using unitary transformations and least square method (LSM). Our proposed SAM modification is made in context to the proposed Space Electric and Magnetic Sensor (SEAMS) mission to study the radio universe below 16 MHz. SAM introduces a snapshot averaging method to improve the incoherent frequency estimation thereby improving the accuracy of DoA estimation. It can also detect polarization to differentiate between Right Hand Circular Polarlization (RHCP), Right Hand Elliptical Polarlization (RHEP), Left Hand Circular Polarlization (LHCP), Left Hand Elliptical Polarlization (LHEP) and Linear Polarlization (LP). This paper discusses the formalism of SAM and shows the initial results of a scaled version of a DoA experiment at a resonant frequency of \(\sim \)72 MHz.

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快照平均矩阵铅笔法(SAM)的到达方向估计

利用电短天线对射电源的电磁波方向进行估计是射电天文学领域中具有挑战性的问题之一。在本文中，我们开发了一种比现有算法在方向和极化估计方面性能更好的算法。本文提出的快照平均矩阵铅笔法(SAM)是对现有的基于矩阵铅笔法(MPM)的到达方向(DoA)算法的改进。一般来说，MPM是利用幺正变换和最小二乘法来估计非相干电磁波在谱中的DoA。我们提出的SAM修改是在拟议的空间电磁传感器(seam)任务的背景下进行的，该任务旨在研究16mhz以下的无线电宇宙。SAM引入了快照平均方法来改善非相干频率估计，从而提高了DoA估计的精度。它还可以检测偏振，以区分右手圆偏振(RHCP)、右手椭圆偏振(RHEP)、左手圆偏振(LHCP)、左手椭圆偏振(LHEP)和线性偏振(LP)。本文讨论了SAM的形式，并给出了共振频率为\(\sim \) 72 MHz的DoA实验的缩放版本的初步结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.