Iridium Satellite Signals: A Case Study in Interference Characterization and Mitigation for Radio Astronomy Observations

IF 1.5 Q3 ASTRONOMY & ASTROPHYSICS

Journal of Astronomical Instrumentation Pub Date : 2019-03-01 DOI:10.1142/S225117171940009

A. Deshpande, B. M. Lewis

引用次数: 2

Abstract

Several post-detection approaches to the mitigation of radio-frequency interference (RFI) are compared by applying them to the strong RFI from the Iridium satellites. These provide estimates for the desired signal in the presence of RFI, by exploiting distinguishing characteristics of the RFI, such as its polarization, statistics, and periodicity. Our data are dynamic spectra with full Stokes parameters and 1[Formula: see text]ms time resolution. Moreover, since most man-made RFI is strongly polarized, we use the data to compare its unpolarized component with its Stokes I. This approach on its own reduces the RFI intensity by many tens of dBs. A comprehensive approach that also recognizes non-Gaussian statistics, and the time and frequency structure inherent in the RFI, permits exceedingly effective post-detection excision provided full Stokes intensity data are available.

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铱卫星信号:射电天文观测干扰表征和减缓的案例研究

通过将几种后探测方法应用于铱卫星的强射频干扰，对其进行了比较。这些通过利用RFI的不同特征，如极化、统计和周期性，提供了在RFI存在的情况下对所需信号的估计。我们的数据是具有全斯托克斯参数和1[公式：见正文]ms时间分辨率的动态光谱。此外，由于大多数人造RFI都是强极化的，我们使用数据将其非极化分量与Stokes I进行比较。这种方法本身就将RFI强度降低了几十dBs。一种全面的方法，也可以识别非高斯统计，以及RFI固有的时间和频率结构，允许在提供完整的斯托克斯强度数据的情况下进行非常有效的检测后切除。

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

Journal of Astronomical Instrumentation ASTRONOMY & ASTROPHYSICS-

CiteScore

2.30

自引率

7.70%

发文量

期刊介绍： The Journal of Astronomical Instrumentation (JAI) publishes papers describing instruments and components being proposed, developed, under construction and in use. JAI also publishes papers that describe facility operations, lessons learned in design, construction, and operation, algorithms and their implementations, and techniques, including calibration, that are fundamental elements of instrumentation. The journal focuses on astronomical instrumentation topics in all wavebands (Radio to Gamma-Ray) and includes the disciplines of Heliophysics, Space Weather, Lunar and Planetary Science, Exoplanet Exploration, and Astroparticle Observation (cosmic rays, cosmic neutrinos, etc.). Concepts, designs, components, algorithms, integrated systems, operations, data archiving techniques and lessons learned applicable but not limited to the following platforms are pertinent to this journal. Example topics are listed below each platform, and it is recognized that many of these topics are relevant to multiple platforms. Relevant platforms include: Ground-based observatories[...] Stratospheric aircraft[...] Balloons and suborbital rockets[...] Space-based observatories and systems[...] Landers and rovers, and other planetary-based instrument concepts[...]