Results 51 to 60 of about 280 (161)

The First Results of Ionospheric Skywave Propagation Experiment Over Taiwan

Radio Science, Volume 61, Issue 1, January 2026.
Abstract An ionospheric over‐the‐horizon propagation experiment was carried out in Taiwan to investigate characteristics of ionospheric F layer skywave propagation at frequencies 4–12 MHz. Experimental results show that there are prominent diurnal variations in the incident angle, virtual height and plasma frequency at reflection height, which are ...
Hung‐Shi Lin, Ching‐Lun Su, Kang‐Hung Wu, Yen‐Hsyang Chu   +3 more
wiley   +1 more source

RFI Suppression Method for High‐Frequency Passive Bistatic Radar Based on Angle‐Based High‐Order Singular Value Decomposition

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
We propose a multidomain joint orthogonal subspace projection algorithm based on angle‐based high‐order singular value decomposition (HOSVD). By constructing a three‐dimensional range‐Doppler‐angle tensor from multidirectional beamformed data, the method exploits the distinct spatial directivity and strong range correlation of the RFI to jointly ...
Chunlin Sun, Zeyu He, Yiming Wang, Xingpeng Mao   +3 more
wiley   +1 more source

A Generalized Oblique Projection Filter with Flexible Parameter for Interference Suppression

International Journal of Antennas and Propagation, 2015
A generalized oblique projection (GOP) with an adjustable parameter defined as interference suppression cost (ISC) is proposed. Therefore, an optional optimized signal to interference-plus-noise ratio (SINR) and user controlled actions on the ...
Yi-ming Wang, Xing-peng Mao, Hong Hong, Jie Zhang, Yu-mei Cui   +4 more
doaj   +1 more source

Tropospheric Propagation Effects Extracted From ADS‐B Messages

Engineering Reports, Volume 7, Issue 12, December 2025.
This study explores the use of ADS‐B messages to estimate tropospheric effects, effectively isolating atmospheric influences from interference. The approach enables independent lower atmosphere studies and offers a cost‐free supplementary method for satellite applications, benefiting GNSS systems, especially at low elevation angles where multipath and ...
Alina‐Mihaela Badescu
wiley   +1 more source

Radar Polarimetry in Glaciology: Theory, Measurement Techniques, and Scientific Applications for Investigating the Anisotropy of Ice Masses

Reviews of Geophysics, Volume 63, Issue 4, December 2025.
Abstract Dielectric anisotropy in ice alters the propagation of polarized radio waves, so polarimetric radar sounding can be used to survey anisotropic properties of ice masses. Ice anisotropy is either intrinsic, associated with ice‐crystal orientation fabric (COF), or extrinsic, associated with material heterogeneity, such as bubbles, fractures, and ...
Benjamin H. Hills, T. J. Young, David A. Lilien, Esther Babcock, Nicole Bienert, Donald Blankenship, John Bradford, Giancorrado Brighi, Alex Brisbourne, Jørgen Dall, Reinhard Drews, Olaf Eisen, M. Reza Ershadi, Tamara A. Gerber, Nicholas Holschuh, Daniela Jansen, Thomas M. Jordan, Nanna B. Karlsson, Jilu Li, Carlos Martín, Kenichi Matsuoka, Daniel May, Falk M. Oraschewski, John Paden, Nicholas M. Rathmann, Neil Ross, Dustin M. Schroeder, Martin Siegert, Matthew R. Siegfried, Emma Smith, Ole Zeising   +30 more
wiley   +1 more source

Strain Rates Along the Alpine‐Himalayan Belt From a Comprehensive GNSS Velocity Field

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 12, December 2025.
Abstract The Alpine‐Himalayan belt is one of Earth's most dynamic and complex regions, characterized by intense tectonic deformation and seismicity. Comprehensive analyses of continental‐scale crustal deformation and seismic hazards along this extensive orogenic belt require the compilation of large geodetic data sets.
N. Castro‐Perdomo, S. Jónsson, Y. Klinger, F. Masson, T. W. Becker, K. Johnson   +5 more
wiley   +1 more source

High Frequency Radar Perspective of Putative Subglacial Liquid Water on Mars

Geophysical Research Letters, Volume 52, Issue 22, 28 November 2025.
Abstract Anomalously bright radar reflections from the base of Mars' south polar cap raise the tantalizing possibility of present‐day liquid water. Orosei et al. (2018, https://doi.org/10.1126/science.aar7268) first reported bright subsurface echoes from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) prompting studies of ...
Gareth A. Morgan, Matthew R. Perry, Bruce A. Campbell, Nathaniel E. Putzig, Jennifer L. Whitten, Fabrizio Bernardini   +5 more
wiley   +1 more source

Channel probe measurements for the American sector clutter experiment, January, 1994 [PDF]

, 1994
The ionospheric phenomenon called Equatorial Spread F encompasses a variety of effects associated with plasma irregularities occurring in the post-sunset and nighttime ionosphere near the magnetic equator.
Fitzgerald, T. J.
core   +1 more source

Reduced-Dimension STAP Algorithm Based on Local Space Time Coupling Characteristics

Journal of Marine Science and Engineering
Patchy ionospheric clutter in high frequency surface wave radar (HFSWR) exhibits significant non-uniformity and local space time coupling characteristics. However, the best channel method (BCM) algorithm based on the maximum output signal-to-clutter-plus-
Ruilong Ren, Weibo Deng, Fulin Su, Xin Zhang   +3 more
doaj   +1 more source

Dominant Longitudinal Wave‐1 Pattern of the Equatorial Topside Ionosphere in the Early Morning Sector

Earth and Space Science, Volume 12, Issue 8, August 2025.
Abstract The low‐latitude ionosphere has complex longitude structures under the effects of various space environment factors such as non‐migrating tides and the geomagnetic field. In this study, a distinctive wave‐1 dominated longitude pattern occurring in the early morning sector was revealed from the ROCSAT‐1 observation for the low‐latitude topside ...
Yiding Chen, Libo Liu, Huijun Le, Ruilong Zhang   +3 more
wiley   +1 more source