Article
Geochemistry & Geophysics
Lina Yin, Yin Yang, Mingjun Deng, Yunqing Huang, Kailing Chen
Summary: This letter proposes a twofold positioning method (TPM) for multiview spaceborne SAR images to solve the instability problem in the traditional auto-calibration approach. By utilizing the conjugate gradient method for initial and secondary positioning of the normalized RD model, TPM achieves higher accuracy and stability compared to the traditional least squares method.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2023)
Article
Geochemistry & Geophysics
Yanyan Zhang, Robert Wang, Wei Wang, Yunkai Deng
Summary: The paper introduces a multiswath jump SAR to address the complex engineering implementation and data processing challenges of spaceborne high-resolution and wide-swath synthetic aperture radar (SAR). By continuously switching multiple radar signals with nonoverlapping spectrum and processing echo signals using range spectrum splicing and azimuth multichannel reconstruction methods, the proposed SAR demonstrates high-resolution imaging capability for HRWS.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2021)
Article
Biodiversity Conservation
M. Arasumani, Fabian Thiel, Vu-Dong Pham, Christina Hellmann, Moritz Kaiser, Sebastian van der Linden
Summary: Peatlands are important for carbon sequestration, but drained peatlands contribute to carbon emissions. Rewetting drained peatlands can reduce emissions and create new carbon sinks, but alternative agriculture schemes are needed. Remote sensing, especially with hyperspectral images, can be used to monitor the vegetation composition of rewetted peatland areas.
ECOLOGICAL INDICATORS
(2023)
Article
Engineering, Marine
Florian Kokoszka, Simona Saviano, Vincenzo Botte, Daniele Iudicone, Enrico Zambianchi, Daniela Cianelli
Summary: This paper presents a validation exercise between the regional ocean modeling system (ROMS) and high-frequency radar (HFR) data, and compares the model results with surface fields generated by HFR. The results show that the circulation model accurately reproduces basic circulation features despite some model drawbacks.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Rui Cao, Yong Wang, Yun Zhang
Summary: A novel analysis approach of imaging projection plane (IPP) is proposed in this study, which can derive the expressions of spaceborne hybrid synthetic aperture radar (SAR) and inverse SAR (ISAR) imaging results of ship target on the sea surface under different conditions. With this method, the representation of radar image in different views can be predicted in advance.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Geography, Physical
Yitong Luo, Xiaolan Qiu, Lingxiao Peng, Wei Wang, Bei Lin, Chibiao Ding
Summary: This paper investigates the challenges of extracting refined digital surface models using stereo SAR and proposes a novel stereo SAR approach combined with geometric semantic constraints to reduce the impact of matching errors on localization. Simulation experiments and real data experiments demonstrate the effectiveness of the proposed method.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2022)
Article
Engineering, Electrical & Electronic
Yufan Song, Jingjing Zhang, Shuang Jin, Guoxu Li, Hui Bi
Summary: This article presents a novel spaceborne squint SAR sparse imaging method that can eliminate the effects of squint to a certain extent and improve the quality of SAR image.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2022)
Article
Environmental Sciences
Luis Guanter, Itziar Irakulis-Loitxate, Javier Gorrono, Elena Sanchez-Garcia, Daniel H. Cusworth, Daniel J. Varon, Sergio Cogliati, Roberto Colombo
Summary: The potential of PRISMA satellite for mapping methane emissions from fossil fuel production activities is evaluated in this study, with a matched-filter algorithm used to detect methane concentration enhancements in the shortwave infrared spectral region. The study also includes a simulation-based sensitivity analysis to assess the retrieval performance for different sites. The results show that surface brightness and homogeneity are key factors for detecting and quantifying methane plumes with PRISMA, with retrieval precision errors ranging from 61 to 197 parts-per-billion in the evaluated images.
REMOTE SENSING OF ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Yan Li, Jinsong Chong, Zongze Li
Summary: The paper proposes a simulation method for a two-dimensional sea-surface current field in trajectory-crossing spaceborne SAR, which lays a foundation for analyzing the impact of various parameters in the application of the trajectory-crossing method. The simulation experiment shows the reliability of the proposed method with current velocity error less than 0.03 m/s and direction error less than 10 degrees.
APPLIED SCIENCES-BASEL
(2022)
Article
Marine & Freshwater Biology
Xiangyang Zheng, Yana Ding, Yandong Xu, Tao Zou, Ling Meng, Cheng Tang, Qianguo Xing
Summary: This study assessed the surface current measured by two HF radars in Rongcheng, China. Despite the presence of numerous suspended aquaculture facilities and kelps, the Doppler spectrums of the HF radars still showed notable first-order peaks. The radar can still effectively measure the surface current within the suspended kelp aquaculture zone, although the working range may be reduced due to the weakened echo power caused by the suspended kelp aquaculture.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Geochemistry & Geophysics
Arun Babu, Dominik Gerber, Stefan V. Baumgartner, Gerhard Krieger
Summary: A semiempirical model for estimating road surface roughness using high-resolution spaceborne X-band SAR datasets is proposed for the first time. Techniques such as SNR thresholding, multi-dataset fusion, and automatic road extraction are implemented to enhance the reliability of the results. The study's results show good agreement with ground-truth data.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2023)
Article
Geochemistry & Geophysics
Marwan Younis, Felipe Queiroz de Almeida, Michelangelo Villano, Sigurd Huber, Gerhard Krieger, Alberto Moreira
Summary: This article explores the use of deployable reflector antennas illuminated by a digital feed array for imaging in SAR systems, focusing on onboard functionality, operational techniques, and DBF aspects with a rigorous mathematical description. The approach of the trilogy is to start from basic imaging concepts and progressively move towards more advanced modes, increasing complexity step by step.
IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE
(2021)
Article
Geochemistry & Geophysics
Marwan Younis, Felipe Queiroz De Almeida, Michelangelo Villano, Sigurd Huber, Gerhard Krieger, Alberto Moreira
Summary: This article introduces the method of improving the performance of SAR systems using digital beamforming technology, and provides detailed explanations on multichannel SAR and the basic operation mode of SCORE system.
IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE
(2022)
Article
Geochemistry & Geophysics
Zegang Ding, Pengnan Zheng, Tianyi Zhang, Han Li, Zhe Li, Teng Long, Tao Zeng
Summary: This article proposes a novel spaceborne multichannel SAR imaging algorithm for maritime moving targets, which separates different moving targets by coarse imaging and estimates the phase error based on the relationship between phase errors and amplitudes of spurious targets. An iterative strategy is adopted to improve the accuracy of estimation and suppress undesired effects, resulting in a well-focused SAR image.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geochemistry & Geophysics
Yitong Luo, Xiaolan Qiu, Qian Dong, Kun Fu
Summary: This letter proposes a robust stereo positioning solution for multiview spaceborne SAR images based on the RD model, which normalizes the traditional RD model and introduces a weighting strategy to improve positioning accuracy, suitable for multiview stereo positioning using images from different satellites with varying orbit accuracies. Experiments using GaoFen-3 and TerraSAR-X satellite data sets validate the effectiveness of the proposed method.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Oceanography
Yoshihiko Ide, Yutaka Yoshikawa
JOURNAL OF OCEANOGRAPHY
(2016)
Article
Oceanography
Wei Zhang, Naoto Ebuchi, Yasushi Fukamachi, Yutaka Yoshikawa
JOURNAL OF OCEANOGRAPHY
(2016)
Article
Marine & Freshwater Biology
Tomoyuki Shikata, Goh Onitsuka, Kazuo Abe, Saho Kitatsuji, Kei Yufu, Yutaka Yoshikawa, Tsuneo Honjo, Kazuyoshi Miyamura
Article
Geosciences, Multidisciplinary
John Philip Matthews, Lev Ostrovsky, Yutaka Yoshikawa, Satoru Komori, Hitoshi Tamura
Article
Oceanography
Goh Onitsuka, Yutaka Yoshikawa, Tomoyuki Shikata, Kei Yufu, Kazuo Abe, Takahisa Tokunaga, Katsunori Kimoto, Takeshi Matsuno
JOURNAL OF OCEANOGRAPHY
(2018)
Article
Oceanography
Yasushi Fujiwara, Yutaka Yoshikawa, Yoshimasa Matsumura
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2018)
Article
Oceanography
Yutaka Yoshikawa, Yasuyuki Baba, Hideaki Mizutani, Teruhiro Kubo, Chikara Shimoda
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2018)
Editorial Material
Oceanography
Yasushi Fujiwara, Yutaka Yoshikawa, Yoshimasa Matsumura
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2019)
Article
Oceanography
Yusuke Ushijima, Yutaka Yoshikawa
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2019)
Article
Oceanography
Yusuke Ushijima, Yutaka Yoshikawa
Article
Oceanography
Yasushi Fujiwara, Yutaka Yoshikawa
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2020)
Article
Meteorology & Atmospheric Sciences
Yasushi Fujiwara, Yutaka Yoshikawa, Yoshimasa Matsumura
Article
Oceanography
Yutaka Yoshikawa, Takao Kawasaki, Hiroyasu Hasumi
Summary: The study proposed diagnostic equations to evaluate the meridional overturning circulation (MOC) simulated in ocean general circulation models (OGCMs). It found that stronger vertical mixing does not intensify the MOC as previously thought, and that geostrophic flow plays a dominant role in MOC dynamics. Additionally, ageostrophic flows contribute significantly to small-scale features of the MOC.
JOURNAL OF OCEANOGRAPHY
(2021)
Article
Geosciences, Multidisciplinary
Tomohiro Inoue, Yoshihiro Ito, Laura M. Wallace, Yutaka Yoshikawa, Daisuke Inazu, Emmanuel Soliman M. Garcia, Tomoya Muramoto, Spahr C. Webb, Kazuaki Ohta, Syuichi Suzuki, Ryota Hino
Summary: The study identified that ocean bottom pressure data in the Hikurangi subduction zone offshore New Zealand show coherent signals at common water depths. By statistically evaluating the similarity of seafloor pressure records collected in 2014 off the east coast of the North Island, it was determined that removing noise caused by oceanographic processes is crucial for detecting small vertical movements of the seafloor crust during slow slip events. Results show that seafloor pressure records from similar depths can effectively reduce oceanographic noise in order to reveal seafloor crustal deformation, similar to findings in the Cascadia subduction zone.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Oceanography
Yoshinobu Wakata, Takahiro Endoh, Yutaka Yoshikawa
CONTINENTAL SHELF RESEARCH
(2017)