Results 41 to 50 of about 279 (160)

Investigation on the Coherent Component of SHARAD Surface Echo and Surface Roughness: Scaling Behavior and Influence of Hurst Exponent

Earth and Space Science, Volume 13, Issue 2, February 2026.
Abstract The radar surface echo can be separated into coherent and incoherent components by statistical approaches, and the coherent component can be described by a backscattering model related to the RMS height. According to backscattering models for fractal surfaces, the coherent power in decibels decreases with RMS height on a scale independent of ...
Tiansheng Hong, Yan Su, Elena Pettinelli, Roberto Orosei, Sebastian Emanuel Lauro, Zhibin Li, Chunyu Ding, Elisabetta Mattei, Barbara Cosciotti, Chunlai Li   +9 more
wiley   +1 more source

Ionospheric clutter mitigation using one-dimensional or two-dimensional wavelet processing

, 2008
International audienceIonospheric clutter mitigation is an important issue for high-frequency surface wave radar (HFSWR) signal processing. Clutter results from a sky wave propagation mode, which is backscattered by ionospheric ionisation irregularities.
Hélier, Marc, Saillant, Stéphane, Jangal, Florent   +2 more
core   +1 more source

Cognitive HF radar

The Journal of Engineering, 2019
Radars operating in the high-frequency (HF) band can exploit propagation modes other than line-of-sight and are hence widely employed to provide over-the-horizon surveillance and remote sensing.
Stuart Anderson
doaj   +1 more source

Deep Learning Aided Time–Frequency Analysis Filter Framework for Suppressing Ionosphere Clutter

Remote Sensing, 2022
In a heterogeneous environment, the ionosphere is dynamically changing in the Earth’s middle latitude, and backscatter from fast-moving irregularities in the plasma can cause ionosphere clutter to extend. Suppressing varying ionosphere clutter and exploring obscured targets are challenging tasks for high frequency surface wave radar (HFSWR).
Xiaowei Ji, Jiaming Li 0016, Qiang Yang 0003, Linwei Wang, Ying Suo, Xiaochuan Wu   +5 more
openaire   +2 more sources

Low Frequency Oscillation Observed in the Ionosphere Around the Substorm Onsets

Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract Three substorm events in which Defense Meteorological Satellite Program (DMSP) spacecraft are geomagnetically co‐located with substorm onset locations in IMAGE far ultraviolet auroral images are analyzed. A Hilbert‐Huang Transform is used to decompose the DMSP B⊥ ${B}_{\perp }$ in the ionosphere to its intrinsic mode functions. A dominant mode
Simon Wing, Jay R. Johnson, Elmer C. Rivera, Arthur J. Hull, Peter Damiano   +4 more
wiley   +1 more source

Accurate and Robust Sensing of the Ionosphere With Uncoded Long Pulse ISR Measurements: 1‐Lag Profile Inversion of Ion Composition and Temperature

Radio Science, Volume 61, Issue 1, January 2026.
Abstract Incoherent scatter radar probing of the topside F‐region ionosphere with reduced electron densities residing at relatively large radar ranges requires the use of uncoded long pulse (ULP) transmissions. In these ULP measurements the range resolution is necessarily poor, rendering the inference of ionospheric state parameters such as composition,
Binghui Wang, Erhan Kudeki, Farzad Kamalabadi, Yulun Wu   +3 more
wiley   +1 more source

Characterization of a Lava Plain NW of Ascraeus Mons, Mars, Through Surface Morphometric Analyses and SHARAD Subsurface Detections

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract The Martian lava plains are characterized by their extensive, low‐relief surfaces, which are the result of numerous basaltic eruptions and feature a variety of volcanic landforms, including vents, cones, pits, and skylights. The combination of these features and impact craters yields a significant understanding of the planet's geological past ...
G. Nodjoumi, S. E. Lauro, M. Valiante, E. Luzzi, A. P. Rossi   +4 more
wiley   +1 more source

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

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

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