Results 21 to 30 of about 1,492 (208)

Statistical Analysis of Performance of Optimisation‐Based SAR Autofocus

IET Radar, Sonar & Navigation
Transionospheric SAR autofocus is a variational algorithm designed to circumvent the deficiencies of conventional autofocus techniques in correcting the distortions of spaceborne SAR images due to ionospheric turbulence.
Patrick Haughey, Mikhail Gilman, Semyon Tsynkov   +2 more
doaj   +2 more sources

Second-order spectrum extraction based on ionospheric clutter

IEICE Communications Express, 2018
Anyun Yin, Zili Li
openaire   +3 more sources

Spread sea clutter suppression via prior knowledge‐based space time adaptive processing in high frequency hybrid sky‐surface wave radar

IET Radar, Sonar & Navigation, 2023
In high frequency (HF) hybrid sky‐surface wave radar, the first‐order sea clutter broadening is severe under the action of ionospheric phase disturbance and bistatic angles.
Ya‐Jun Li, Zhuo‐Qun Wang, Lin Xu, Wen‐Hao Zhang, Zhu‐Hao Lu, Zhi‐Cheng Wang   +5 more
doaj   +1 more source

Experimental Observation and Analysis of Ionosphere Echoes in the Mid-Latitude Region of China Using High-Frequency Surface Wave Radar and Ionosonde

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
Ionospheric clutter is a major factor affecting the performance of high-frequency surface wave radar (HFSWR). Previous studies have been mainly focused on the development of ionospheric clutter suppression methods involving delicate signal processing ...
Xuguang Yang, Mingjie Wang, Weimin Huang, Changjun Yu   +3 more
doaj   +1 more source

Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar [PDF]

Annales Geophysicae, 2000
Incoherent scatter radars measure ionosphere parameters using modified Thomson scatter from free electrons in the target (see e.g. Hagfors, 1997). The integrated cross section of the ionospheric scatterers is extremely small and the measurements can ...
T. Turunen, J. Markkanen, A. P. van Eyken   +2 more
doaj   +1 more source

Space-Time Adaptive Processing Clutter-Suppression Algorithm Based on Beam Reshaping for High-Frequency Surface Wave Radar

Remote Sensing, 2022
In high-frequency surface wave radar (HFSWR) systems, clutter is a common phenomenon that causes objects to be submerged. Space-time adaptive processing (STAP), which uses two-dimensional data to increase the degrees of freedom, has recently become a ...
Jiaming Li, Qiang Yang, Xin Zhang, Xiaowei Ji, Dezhu Xiao   +4 more
doaj   +1 more source

A Network of Portable, Low-Cost, X-Band Radars [PDF]

, 2012
Radar is a unique tool to get an overview on the weather situation, given its high spatio- temporal resolution. Over 60 years, researchers have been investigating ways for obtaining the best use of radar.
Allegretti, Marco, Bertoldo, Silvano, Gabella, Marco, Lucianaz, Claudio, Notarpietro, Riccardo, Perona, Giovanni Emilio, Prato, Andrea, Rorato, Oscar   +7 more
core   +2 more sources

Phase-coded pulse aperiodic transmitter coding [PDF]

, 2009
Both ionospheric and weather radar communities have already adopted the method of transmitting radar pulses in an aperiodic manner when measuring moderately overspread targets.
I. I. Virtanen, J. Vierinen, M. S. Lehtinen   +2 more
core   +6 more sources

Spread Sea Clutter Suppression in HF Hybrid Sky-Surface Wave Radars Based on General Parameterized Time-Frequency Analysis

International Journal of Antennas and Propagation, 2020
In high-frequency (HF) hybrid sky-surface wave radar, the first-order sea clutter broadening is severe under the action of ionospheric phase disturbance and bistatic angles. In this paper, a cascaded method is described to suppress the spread sea clutter.
Zhuo-qun Wang, Ya-jun Li, Jun-nan Shi, Peng-fei Wang, Ai-hua Liu, Xin-fan Xia, De-hong Chen   +6 more
doaj   +1 more source

A Modified PGA for Spaceborne SAR Scintillation Compensation Based on the Weighted Maximum Likelihood Estimator and Data Division

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2022
The P-band spaceborne synthetic aperture radar (SAR) is significantly affected by ionospheric scintillation. Although the traditional phase gradient autofocus (PGA) can estimate and compensate for the scintillation phase of the single-polarization SAR ...
Hongcheng Zeng, Wei Yang, Pengbo Wang, Jie Chen   +3 more
doaj   +1 more source