Results 11 to 20 of about 18,526,084 (268)

Performance Evaluation of a Modified SweepSAR Mode for Quad-Pol Application in SAR Systems [PDF]

Journal of Electromagnetic Engineering and Science, 2020
Efficient earth observation using spaceborne synthetic aperture radar (SAR) requires the analysis of high-resolution wide-swath (HRWS) systems, which have a fine resolution and a short revisit time through wide-area observation, and quadrature ...
Jung-Hwan Lim, Jae Wook Lee, Taek-Kyung Lee, Hyeon-Cheol Lee, Sang-Gyu Lee, Sang-Burm Ryu, Seong-Sik Yoon   +6 more
doaj   +1 more source

Responses of surface ozone to future agricultural ammonia emissions and subsequent nitrogen deposition through terrestrial ecosystem changes [PDF]

Atmospheric Chemistry and Physics, 2021
With the rising food demands from the future world population, more intense agricultural activities are expected to cause substantial perturbations to the global nitrogen cycle, aggravating surface air pollution and imposing stress on terrestrial ...
X. Liu, X. Liu, A. P. K. Tai, A. P. K. Tai, A. P. K. Tai, K. M. Fung, K. M. Fung   +6 more
doaj   +1 more source

Observations of aerosol optical properties at a coastal site in Hong Kong, South China [PDF]

Atmospheric Chemistry and Physics, 2017
Temporal variations in aerosol optical properties were investigated at a coastal station in Hong Kong based on the field observation from February 2012 to February 2015. At 550 nm, the average light-scattering (151 ± 100 Mm−1) and absorption coefficients
J. Wang, A. Virkkula, Y. Gao, S. Lee, Y. Shen, X. Chi, W. Nie, Q. Liu, Z. Xu, X. Huang, T. Wang, L. Cui, A. Ding   +12 more
doaj   +1 more source

Significant production of ClNO₂ and possible source of Cl₂ from N₂O₅ uptake at a suburban site in eastern China [PDF]

Atmospheric Chemistry and Physics, 2020
ClNO2 and Cl2 can affect atmospheric oxidation and thereby the formation of ozone and secondary aerosols, yet their sources and production mechanisms are not well understood or quantified. In this study we present field observations of ClNO2 and Cl2 at a
M. Xia, X. Peng, W. Wang, C. Yu, P. Sun, Y. Li, Y. Liu, Z. Xu, Z. Wang, Z. Wang, Z. Xu, W. Nie, A. Ding, T. Wang   +13 more
doaj   +1 more source

MEO SAR: System Concepts and Analysis [PDF]

IEEE Transactions on Geoscience and Remote Sensing, 2020
Existing microwave remote sensing instruments used for Earth observation face a clear tradeoff between spatial resolution and revisit times at global scales. The typical imaging capabilities of current systems range from daily observations at kilometer-scale resolutions provided by scatterometers to meter-scale resolutions at lower temporal rates (more
Jalal Matar, Marc Rodriguez-Cassola, Gerhard Krieger, Paco López-Dekker, Alberto Moreira   +4 more
openaire   +6 more sources

High resolution PolInSAR with the ground-based SAR (GB-SAR) System: measurement and modelling [PDF]

, 2006
Ground-based work is necessary for a comprehensive assessment of the operational potential and limitations of PolInSAR in airborne and satellite SAR applications. A study is made of the performance and usefulness of the UK’s Ground-Based SAR (GB-SAR)
Morrison, Keith, Williams, Mark L., M.L. Williams, K. Morrison   +3 more
core   +1 more source

Cross-Pol Pattern Effects of Parabolic Reflector Antennas on the Performance of Spaceborne Quad-Pol SAR Systems [PDF]

Journal of Electromagnetic Engineering and Science, 2021
The ambiguity performance related to the image quality of a synthetic aperture radar (SAR) system can be categorized into range ambiguity, azimuth ambiguity, and cross ambiguity depending on the cause of the ambiguity signals.
Jung-Hwan Lim, Jae Wook Lee, Taek-Kyung Lee   +2 more
doaj   +1 more source

Advanced Digital Beamforming Concepts for Future SAR Systems [PDF]

, 2010
This paper reviews advanced multi-channel SAR system concepts for the imaging of wide swaths with high resolution. Several novel system architectures employing both direct radiating arrays and reflector antennas fed by a digital array are introduced ...
A. Patyuchenko, Bordoni, Federica, A. Moreira, Krieger, Gerhard, Patyuchenko, Anton, F. Bordoni, Huber, Sigurd, S. Huber, Moreira, Alberto, Younis, Marwan, G. Krieger, Gebert, Nicolas, M. Younis, N. Gebert   +13 more
core   +1 more source

Influence of plant ecophysiology on ozone dry deposition: comparing between multiplicative and photosynthesis-based dry deposition schemes and their responses to rising CO₂ level [PDF]

Biogeosciences, 2022
Dry deposition is a key process for surface ozone (O3) removal. Stomatal uptake is a major component of O3 dry deposition, which is parameterized differently in current land surface models and chemical transport models.
S. Sun, A. P. K. Tai, A. P. K. Tai, D. H. Y. Yung, A. Y. H. Wong, A. Y. H. Wong, J. A. Ducker, C. D. Holmes   +7 more
doaj   +1 more source

Novel MIMO-SAR system applied for high-speed and high-accuracy deformation measurement

The Journal of Engineering, 2019
As a novel system, multiple-input multiple-output synthetic aperture radar (MIMO-SAR) has achieved rapid development in the past years. Based on the MIMO technique, multiple transmitting and receiving antennas could be utilised to compose a specific ...
Cheng Hu, Yunkai Deng, Weiming Tian, Jingyang Wang, Tao Zeng   +4 more
doaj   +1 more source