Results 21 to 30 of about 641,941 (183)

Range Ambiguity Suppression Approach for Quad-pol SAR Systems Based on Modified Azimuth Phase Coding

Leida xuebao, 2017
For conventional quadrature-polarimetric (quad-pol) Synthetic Aperture Radar (SAR) systems, as cross-polarized (cross-pol) channels are influenced by the strong co-polarized (co-pol) range ambiguous returns, the range ambiguity levels of cross ...
Zhu Xiaojing, Li Fei, Wang Robert, Wang Wei, Sun Xiang   +4 more
doaj   +2 more sources

Suppression of Additional Azimuth Ambiguities Under Multi-Channel and Multi-Waveform SAR

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
Future spaceborne SAR satellites are going to handle multiple receivers to take both high resolution and wide observation swath. In addition, they will transmit multiple chirp patterns to reduce the effect of the range ambiguity. Such a multi-channel and multi-waveform system raises additional azimuth ambiguities caused by the phase distortion of the ...
Natsuaky, Ryo, Prats-Iraola, Pau
openaire   +2 more sources

A Multiple-Input Multiple-Output Synthetic Aperture Radar Echo Separation and Range Ambiguity Suppression Processing Framework for High-Resolution Wide-Swath Imaging

Remote Sensing
Multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) is a promising scheme for high-resolution wide-swath (HRWS) imaging. After echo separation processing, a MIMO-SAR system can provide many equivalent phase centers (EPCs) in azimuth ...
Haonan Zhao, Zhimin Zhang, Zhen Chen, Huaitao Fan, Zongsen Lv, Jianzhong Bi   +5 more
doaj   +2 more sources

A Novel Non-Stationary Clutter Suppression Approach for Space-Based Early Warning Radar Using an Interpulse Multi-Frequency Mode

Remote Sensing
The non-stationary clutter of space-based early warning radar (SBEWR) is more serious than that of airborne early warning radar. This phenomenon is primarily attributed to the Earth’s rotation and range ambiguity.
Ning Qiao, Shuangxi Zhang, Shuo Zhang, Qinglei Du, Yongliang Wang   +4 more
doaj   +2 more sources

Cascade Clutter Suppression Method for Airborne Frequency Diversity Array Radar Based on Elevation Oblique Subspace Projection and Azimuth-Doppler Space-Time Adaptive Processing

Remote Sensing
Airborne Frequency Diversity Array (FDA) radar operating at a high pulse repetition frequency encounters severe range-ambiguous clutter. The slight frequency increments introduced by the FDA result in angle and range coupling.
Rongwei Lu, Yifeng Wu, Lei Zhang, Ziyi Chen   +3 more
doaj   +2 more sources

Integrating Agile Waveforms With DBF for HRWS SAR Imagery and Adaptive Jamming Suppression

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023
Range ambiguity resolving and deceptive jamming suppression are both challenges for high-resolution wide-swath SAR imagery. With the accommodation of the digital beamforming (DBF) techniques, agile waveforms are of potential to tackle the ambiguity ...
GanE Dai, Sha Huan, Lei Zhang
doaj   +1 more source

Unambiguous Reconstruction for Multichannel Nonuniform Sampling SAR Signal Based on Image Fusion

IEEE Access, 2020
Multichannel signal processing in azimuth is a vital technique to enable a wide-swath Synthetic Aperture Radar (SAR) with high azimuth resolution. However, the multichannel high-resolution and wide-swath (HRWS) SAR system always suffers from the problem ...
Liming Zhou, Xiaoling Zhang, Yangyang Wang, Liang Li, Liming Pu, Jun Shi, Shunjun Wei   +6 more
doaj   +1 more source

Range Ambiguity Smearing and Suppression: Comparison of Different Azimuth Phase Codes and Opportunities from Multi-Focus Post-Processing [PDF]

, 2021
Synthetic Aperture Radar (SAR) remote sensing has become very attractive in Earth observation applications, since it provides high resolution imaging independent of weather conditions and sunlight illumination.
Villano, Michelangelo, Dell Amore, Luca, Nogueira Peixoto, Maxwell, Krieger, Gerhard   +3 more
core  

Accounting for Azimuth Ambiguities in Interferometric Performance Analysis [PDF]

, 2012
Azimuth ambiguities affect the interferometric performance of SAR systems, causing a bias in the interferometric phase and a modulation of the interferometric coherence, as also visible in some TanDEM-X interferograms.
Villano, Michelangelo, Krieger, Gerhard, Michelangelo Villano, Gerhard Krieger   +3 more
core   +1 more source

IMPROVEMENT OF DIGITAL DEVICE FOR SUPPRESSION OF ERRONEOUS REQUEST BY LATERAL PETALS OF THE ANTENNA OF AIR TRAFFIC CONTROL SYSTEMS

Компютерні системи та інформаційні технології, 2022
This article considers the expansion of the capabilities of digital devices of three-pulse suppression of the request of aircraft responders with side petals in terms of increasing the accuracy of measuring the azimuth of flight of aircraft.
TETIANA HOVORUSHCHENKO, ALEXANDER YANOVITSKIY   +1 more
doaj   +1 more source