Results 41 to 50 of about 439 (181)
Fault Network Geometry Modulates Earthquake Source Spectra Across Scales
Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.Abstract Earthquake source spectra provide unique insights into the earthquake rupture process. Motivated by previous research suggesting that complex fault geometries enhance high‐frequency seismic radiation, we study the influence of fault network geometry on earthquake source spectra using multiple independent observations.
Jaeseok Lee +4 more
wiley +1 more source
Ambiguity and area preserving linear transformations in over‐the‐horizon radar
IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.The use of recurrent waveforms in over‐the‐horizon radar (OTHR) necessitates techniques for ambiguity resolution and manipulation. In this paper, the authors elucidate methods for systematically transforming any given waveform so that its ambiguity function is transformed by any desired area preserving the linear transformation of the delay‐Doppler ...
Stephen D. Howard, Van Khanh Nguyen
wiley +1 more source
A bayesian approach to adaptive detection in nonhomogeneous environments [PDF]
, 2008 We consider the adaptive detection of a signal of interest embedded in colored noise, when the environment is nonhomogeneous, i.e., when the training samples used for adaptation do not share the same covariance matrix as the vector under test. A Bayesian
Bidon, Stéphanie +2 more
core +1 more source
Knowledge-Based Adaptive Processing for Ship Detection in OTH Radar
2006 International Radar Symposium, 2006 This paper is concerned with adaptive Doppler processing in high frequency (HF) over-the-horizon (OTH) radar to improve the detection of slow-moving ships against clutter. A knowledge-based adaptive detection approach that exploits additional information to identify the surfaces that scatter clutter in each radar resolution cell (i.e. land, sea or land-
G. FABRIZIO +5 more
core +3 more sources
Signal Processing Methods to Improve Ocean Surface Wave Estimation from a High Frequency Surface Wave Radar [PDF]
, 2011 High frequency surface wave radars are operated as a remote sensor to measure ocean surface parameters to ranges exceeding 200-300 km from the coastline.
Wang, Wei
core
IET Radar, Sonar &Navigation, Volume 18, Issue 10, Page 1779-1795, October 2024.Specifically, the authors propose a novel CGAN architecture that can control the azimuth angle for arbitrary angle generation, capable of complementing missing CSAR sub‐aperture information. The network incorporates angular labels for various scenarios and integrates a dynamic region‐aware convolution (DRconv) module.
Bingxuan Li +4 more
wiley +1 more source
A Multistatic Over-the-Horizon Radar Simulator
13611366A multistatic Over-the Horizon (OTH) radar network can offer long-range, wide-area early warning for distant threats, such as ballistic and hypersonic missiles.
Tsikrikonis, Nikolaos +5 more
core +1 more source
On the Use of SuperDARN Ground Backscatter Measurements for Ionospheric Propagation Model Validation
Space Weather, Volume 22, Issue 9, September 2024.Abstract Prior to use in operational systems, it is essential to validate ionospheric models in a manner relevant to their intended application to ensure satisfactory performance. For Over‐the‐Horizon radars (OTHR) operating in the high‐frequency (HF) band (3–30 MHz), the problem of model validation is severe when used in Coordinate Registration (CR ...
Joshua J. Ruck +6 more
wiley +1 more source
A chirplet‐based masking algorithm for smeared spectrum jamming suppression and signal separation
IET Radar, Sonar &Navigation, Volume 18, Issue 9, Page 1409-1430, September 2024.The authors propose a chirplet‐based masking algorithm that can solve the problem of SMSP jamming suppression and address a more complex problem: the separation of jamming signal and multiple LFM signals from intercepted mixed signal. First, the authors obtain matched chirp rates of the source signals through the changing tendency of the Rényi entropy.
Yifan Wang +4 more
wiley +1 more source
Climatological Model of Over‐the‐Horizon Radar
, 2018 Published online 1 SEP 2018. This article also appears in: URSI General Assembly and Scientific Symposium (2017).Models of radar systems are required for a variety of reasons.
M. A. Cervera +5 more
core +1 more source