Results 41 to 50 of about 618,348 (165)
A practical bistatic passive radar system for use with DAB and DRM illuminators [PDF]
, 2008 Digital broadcasts provide powerful illuminators of opportunity with waveforms that produce excellent radar ambiguity functions. An experimental program to investigate the possibility of such broadcasts for target tracking radar is described. In addition,
H. Yardley +5 more
core +1 more source
An improved adaptive sidelobe blanker [PDF]
, 2008 We propose a two-stage detector consisting of a subspace detector followed by the whitened adaptive beamformer orthogonal rejection test. The performance analysis shows that it possesses the constant false alarm rate property with respect to the unknown
Orlando, Danilo +5 more
core +1 more source
Recovery Following Recurrent Fires Across Mediterranean Ecosystems
Global Change Biology, Volume 30, Issue 12, December 2024.Mediterranean ecosystems worldwide are frequently affected by fires. Focusing on areas that burned two times over the past 22 years, we study the post‐fire dynamics, applying a statistical model to the time‐series of a remotely sensed proxy for vegetation cover.
Tiago Ermitão +3 more
wiley +1 more source
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 Quality Control Concept for Radar Reflectivity, Polarimetric Parameters, and Doppler Velocity [PDF]
, 2006 Over the last few years the use of weather radar data has become a fundamental part of various applications like rain-rate estimation, nowcasting of severe weather events, and assimilation into numerical weather prediction models.
Friedrich, Katja +2 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
Measurements and analysis of multistatic and multimodal micro-Doppler signatures for automatic target classification [PDF]
, 2014 The purpose of this paper is to present an experimental trial carried out at the Defence Academy of the United Kingdom to measure simultaneous multistatic and multimodal micro-Doppler signatures of various targets, including humans and flying UAVs ...
Marcio Perassoli +5 more
core +1 more source
工程科学与技术, 2017 :According to insufficient research on the effect of evaporation duct on the propagation of electromagnetic wave in the bay area of West Indian Ocean,PJ evaporation duct model and parabolic equation method were used to investigate the feasibility of ...
田斌 +4 more
doaj
Geophysical Research Letters, Volume 51, Issue 16, 28 August 2024.Abstract Monitoring the generation and movement of equatorial plasma bubbles (EPBs) in a large longitude region is crucial important for better understanding their day‐to‐day variability. Using the newly developed Low lAtitude long Range Ionospheric raDar (LARID) at Dongfang (19.2°N, 108.8°E, dip lat.
Lianhuan Hu +11 more
wiley +1 more source