Range Imaging of E-Region Field-Aligned Irregularities by Using a Multifrequency Technique: Validation and Initial Results

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Title:	Range Imaging of E-Region Field-Aligned Irregularities by Using a Multifrequency Technique: Validation and Initial Results
Authors:	朱延祥;Chen, Jenn-Shyong;Chu, Yen-Hsyang;Su, Ching-Lun;Hashiguchi, Hiroyuki;Li, Ying
Contributors:	太空科學與科技研究中心
Keywords:	Binary codes;Calibration;E region;Field-aligned irregularities (FAIs);Imaging;Ionosphere;Irregularities;Logic gates;Radar antennas;Radar imaging;range imaging (RIM);Reaction injection molding;Sidelobes;Upper atmosphere;very high frequency (VHF) atmospheric radar;Wind shear
Date:	2016-07-01
Issue Date:	2026-04-23 11:03:39 (UTC+8)
Publisher:	Institute of Electrical and Electronics Engineers Inc.;New York: IEEE
Abstract:	摘要： This paper reports the first use of a multifrequency range imaging (RIM) technique for observing E-region field-aligned irregularities (FAIs) in the midlatitude ionosphere. The Middle and Upper atmosphere Radar (MUR; 34.85°N, 136.10°E) was used to conduct experiments with five equally spaced frequencies between 46.25 and 46.75 MHz. Three types of RIM data were examined: data with 13-element binary Barker codes, with 16-element binary complementary codes, and without phase codes. Moreover, two calibration approaches were adopted to validate the applicability of the RIM technique, which functioned as intended. Excellent RIM performance such as the ability to resolve several striations in an echo region of FAIs was demonstrated. However, sidelobe echoes caused by pulse coding mechanisms were occasionally observed at altitudes above and below the source regions in the coded data. Therefore, a procedure was developed according to one of the calibration approaches to identify and remove such kind of sidelobe echoes, which was shown to be applicable for the complementary-coded data. In addition to FAIs, a thin plasma layer with a thickness of approximately 1 km was identified as being structured with some tilted finer structures, which could not be observed in the original intensity images with a range resolution of 600 m. Preliminary estimates of the Doppler velocities indicated that a wind shear effect could be the cause of such tilted finer structures. 其他題名： TGRS 出版者： New York: IEEE 出版日期： 2016-07 出處： IEEE Transactions on Geoscience and Remote Sensing, 2016-07, Vol.54 (7), p.3739-3749 資源來源： IEEE Electronic Library (IEL) 版權： Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2016 識別號： ISSN: 0196-2892 識別號： EISSN: 1558-0644 識別號： DOI: 10.1109/TGRS.2016.2521702 識別號： CODEN: IGRSD2
Appears in Collections:	[CENTER FOR ASTRONAUTICAL PHYSICS AND ENGINEERING (CAPE)] journal & Dissertation

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