Results 101 to 110 of about 2,161,885 (199)

Stepped-Frequency Waveform radar demonstrator and its jamming

, 2009
In this paper we present some applications of the Stepped-Frequency Signal Waveform designed for the obtention of HRRP (High Resolution Range Profiles) and ISAR (Inverse Synthetic Aperture Radar) images for their ulterior use in NCTI (Non-Cooperative ...
Eduardo de Diego, Montiel, Ignacio, Enrique Millan, González-Blanco, Pilar, Borja Errasti, Millán, Enrique, De Diego, Eduardo, Ignacio Montiel, Pilar Gonzalez-Blanco, Errasti, Borja   +9 more
core   +1 more source

Satellite‐Derived Volume Budget of Antarctic Sea Ice

Earth and Space Science, Volume 13, Issue 9, September 2026.
Abstract In recent years, the Antarctic has seen a notable shift in sea ice trends: Where sea ice extent and volume were increasing on average, they have shown an unprecedented decline since 2016. Understanding the drivers of this shift is crucial to determining the impacts of climate change on sea ice and improving modeling of Antarctic sea ice ...
Sabina Sulikova, Gillian Cheong, Carmen Nab, Sabrina Sofea Binti Aliff Raziuddin, Alessandro Silvano, Harold Heorton, Sara Fleury, Florent Garnier, Ted Maksym, Sahra Kacimi, Steven Baker, David Brockley, Isobel Lawrence, Paul R. Holland, Michel Tsamados   +14 more
wiley   +1 more source

FuseCLIP: Semantic-Guided Multidomain Fusion for Few-Shot Radar Active Jamming Recognition

Remote Sensing
Radar active jamming recognition is an essential component of radar anti-jamming processing and cognitive radar decision making. As jamming categories proliferate and electromagnetic environments become more complex, collecting sufficient labeled samples
Zongyuan Yang, Wei Wen, Yukai Kong, Xiang Wang, Zhixiang Huang, Guangshang Cheng   +5 more
doaj   +1 more source

Submarine Landslides Could Cause Wide‐Spread Tsunami Impact in the East Sea (Sea of Japan)

Journal of Geophysical Research: Oceans, Volume 131, Issue 9, September 2026.
Abstract The East Sea (Sea of Japan) is a seismically active back‐arc basin with a history of devastating tsunamis, yet regional hazard assessments and mitigation planning often overlook the tsunamigenic potential of submarine landslides. This study investigates the tsunami impact of large‐scale mass failures along the southwest (SW) margin of the East
Deniz Cukur, Xiaoming Wang, Senay Horozal, Aaaron Micallef, In‐Kwon Um, Seong‐Pil Kim, Gee‐Soo Kong   +6 more
wiley   +1 more source

Seismo‐ and Tsunami‐Traveling Ionospheric Disturbances of the 29 July 2025 M8.8 Kamchatka Earthquake Observed by CW‐HF Doppler Sounding Systems and Ionosondes in Taiwan and Japan

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Doppler frequency shifts (DFSs) recorded by continuous wave‐high frequency Doppler sounding systems and ionograms observed by five ionosondes in Taiwan and Japan are used to study three‐dimensionally seismo‐ and tsunami‐traveling ionospheric disturbances (STIDs and TTIDs) triggered by the 29 July 2025 Mw8.8 Kamchatka earthquake.
Yao‐Chun Chen, Jann‐Yenq Liu, Tien‐Chi Liu, Katsumi Hattori, Jaroslav Chum, Chieh‐Hung Chen, Wen‐Yen Chang, Bor‐Shouh Huang, Rui Song, Horng‐Yuan Yen   +9 more
wiley   +1 more source

An investigation of a frequency diverse array [PDF]

, 2009
This thesis presents a novel concept for focusing an antenna beam pattern as a function of range, time, and angle. In conventional phased arrays, beam steering is achieved by applying a linear phase progression across the aperture.
Antonik, P.
core  

Monostatic Waveform-Domain Passive Radar for Detection and Localization Using a Sparse Circular Array with Deterministic Frequency Dither

Sensors
This paper presents the RaDICAL monostatic passive radar framework for target detection and localization using a sparse uniform circular array (SUCA), multifrequency dither, and dictionary-based waveform processing.
Vladimir Volman, James A. Nessel
doaj   +1 more source

LPI Radar Waveform Modulation Recognition Based on Improved EfficientNet

Electronics
To address the challenge of low modulation recognition accuracy for Low Probability of Intercept (LPI) radar waveforms under low Signal-to-Noise Ratio (SNR) conditions—a critical limitation in current radar signal processing research—this study proposes a novel recognition framework anchored in an improved EfficientNet model.
Yuzhi Qi, Lei Ni, Xun Feng, Hongquan Li, Yujia Zhao   +4 more
openaire   +1 more source

Seasonal Reversal of Polarity Dominance in High‐Current Cloud‐to‐Ground Return Strokes Over East Asian Midlatitudes

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Extreme positive cloud‐to‐ground lightning over East Asian midlatitudes exhibits a spring–autumn double maximum hidden by the familiar winter climatology. Using 1,838,538 return strokes with absolute peak currents at least 200 kA during 2006–2024, we resolve its annual cycle by month and latitude.
Nengxing Guo, Li Cai, Yu Feng, Wenzhao Lu, Yongxing Zeng, Yuheng Niu, Chun Zhao, Shanqiang Gu   +7 more
wiley   +1 more source

The Role of Lightning in Atmospheric Chemistry

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 16, 28 August 2026.
Abstract Lightning has important effects on atmospheric constituents in primarily the middle and upper troposphere. We summarize the effects of lightning on atmospheric chemistry that have been published since the last major review in 2007. The estimates of NOx production by lightning (LNOx) are based on five methods: theoretical/laboratory estimates ...
Kenneth E. Pickering, Dale J. Allen, Heidi Huntrieser   +2 more
wiley   +1 more source