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Journal articles on the topic 'Sar period'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Chen, Linzhouting, Zhanchao Liu, and Jiancheng Fang. "An Accurate Motion Compensation for SAR Imagery based on INS/GPS with Dual-filter Correction." Journal of Navigation 72, no. 06 (2019): 1399–416. http://dx.doi.org/10.1017/s0373463319000365.

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Current Motion Compensation (MOCO) methods using Inertial Navigation System (INS)/Global Positioning System (GPS) integrated systems have provided an important advance in Synthetic Aperture Radar (SAR) imagery, but most of these methods only work well over a short imaging period. With the development of high-resolution SAR that provides image gathering over long periods, the need for higher levels of INS/GPS performance than normally available is desired. The higher requirement of INS/GPS for SAR MOCO is two-fold: (1) the accurate knowledge of location information, and (2) the smoothness of re

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Tan, Hao, Xuexiang Yu, Mingfei Zhu, Shenshen Chi, Chao Liu, and Hengzhi Chen. "Study on large-gradient deformation of mining areas based on InSAR-PEK technology." Earth Sciences Research Journal 27, no. 2 (2023): 191–201. http://dx.doi.org/10.15446/esrj.v27n2.107056.

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To solve large-gradient deformation in mining areas unavailable by SAR data, a method combining PIM Exponent Knothe (PEK) model and InSAR technology (InSAR-PEK) was proposed to predict the mining-induced subsidence and obtain the large-gradient deformation dynamically. Firstly, the maximum subsidence value predicted by the probability integration method was combined with SAR data, and the subsidence values in the initial and residual periods were obtained. Secondly, three groups of power exponent Knothe function parameters were obtained, including csar and ksar based on SAR data, clevel_wz, an

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Li, Changchun, Weinan Chen, Yilin Wang, et al. "Mapping Winter Wheat with Optical and SAR Images Based on Google Earth Engine in Henan Province, China." Remote Sensing 14, no. 2 (2022): 284. http://dx.doi.org/10.3390/rs14020284.

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The timely and accurate acquisition of winter wheat acreage is crucial for food security. This study investigated the feasibility of extracting the spatial distribution map of winter wheat in Henan Province by using synthetic aperture radar (SAR, Sentinel-1A) and optical (Sentinel-2) images. Firstly, the SAR images were aggregated based on the growth period of winter wheat, and the optical images were aggregated based on the moderate resolution imaging spectroradiometer normalized difference vegetation index (MODIS-NDVI) curve. Then, five spectral features, two polarization features, and four

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Hu, Xinchang, Pengbo Wang, Hongcheng Zeng, and Yanan Guo. "An Improved Equivalent Squint Range Model and Imaging Approach for Sliding Spotlight SAR Based on Highly Elliptical Orbit." Remote Sensing 13, no. 23 (2021): 4883. http://dx.doi.org/10.3390/rs13234883.

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As an emerging orbital system with flexibility and brand application prospects, the highly elliptical orbit synthetic aperture radar (HEO SAR) can achieve both a low orbit detailed survey and continuous earth surface observation in high orbit, which could be applied to marine reconnaissance and surveillance. However, due to its large eccentricity, two challenges have been faced in the signal processing of HEO SAR at present. The first challenge is that the traditional equivalent squint range model (ESRM) fails to accurately describe the entire range for the whole orbit period including the per

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Liu, Yingjie, Chan Lu, Yuguo Li, Dan Norbäck, and Qihong Deng. "Outdoor Air Pollution and Indoor Window Condensation Associated with Childhood Symptoms of Allergic Rhinitis to Pollen." International Journal of Environmental Research and Public Health 19, no. 13 (2022): 8071. http://dx.doi.org/10.3390/ijerph19138071.

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Pollen is the main factor causing asthma and allergic rhinitis (AR). However, the key indoor and outdoor factors associated with childhood symptoms of allergic rhinitis (SAR) to pollen are unclear. We investigate the association of exposure to outdoor air pollution and indoor environmental factors with childhood SAR to pollen and consider SAR to pollen in different seasons. A cross-sectional study of 2598 preschool children aged 3–6 was conducted in Changsha, China (2011–2012). The prevalence of SAR to pollen in children and information on indoor environmental factors were obtained by question

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Lee, Young-jin, Tae-Kyung Yoo, Jisun Kim, et al. "Survival outcomes of breast cancer patients with recurrence after surgery according to period and subtype." PLOS ONE 18, no. 7 (2023): e0284460. http://dx.doi.org/10.1371/journal.pone.0284460.

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Purpose To analyze and compare the survival rates of recurrent breast cancer patients in Korea between two periods (period I: 2000–2007; period II: 2008–2013) and to identify the factors associated with outcomes and changes over time in the duration of survival after recurrence. Methods We retrospectively analyzed 2,407 patients who had recurrent breast cancer with treated between January 2000 and December 2013 and divided them into two periods according to the year of recurrence. We reviewed the age at diagnosis, clinical manifestations, pathology report, surgical methods, types of adjuvant t

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Liskiewicz, W. J. "An Evaluation of the Royal Air Force Helicopter Search and Rescue Services in Britain with Reference to Royal Air Force Valley 1980–1989." Journal of the Royal Society of Medicine 85, no. 12 (1992): 727–29. http://dx.doi.org/10.1177/014107689208501206.

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The Royal Air Force (RAF) operates a helicopter Search and Rescue (SAR) service in the United Kingdom and territorial waters; it also provides a similar service in several locations abroad. A 10-year retrospective study of the SAR helicopter service operating from the RAF base at Valley on the island of Anglesey in North Wales is presented, with national SAR statistics over a similar period provided for comparison. Analysis of records kept by SAR aircrew at RAF Valley shows that their assistance had been requested on 1490 occasions during the 10-year period studied; most of these requests were

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Indrady, Andry. "HONG KONG SAR IMMIGRATION IN THE DYNAMICS OF POLITICS, POLICY AND INSTITUTION." Jurnal Ilmiah Kajian Keimigrasian 1, no. 2 (2018): 69–81. http://dx.doi.org/10.52617/jikk.v1i2.22.

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  The Bureaucratic System of the Immigration Department of Hong Kong SAR is one of the legacies from British Colonial Government seen from legal and also immigration bureaucratic perspectives reflect the executive power domination over immigration policymaking. This is understandable since Hong Kong SAR adopts “Administrative State Model” which means Immigration Officer as a bureaucrat holds significant roles at both stages of policymaking and also its implementation. This research looks at transition period of the Immigration Department and its policies since the period of handove

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Trikojat, K., A. Buske-Kirschbaum, J. Schmitt, and F. Plessow. "Altered performance in attention tasks in patients with seasonal allergic rhinitis: seasonal dependency and association with disease characteristics." Psychological Medicine 45, no. 6 (2014): 1289–99. http://dx.doi.org/10.1017/s0033291714002384.

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Background.Seasonal allergic rhinitis (SAR) is a chronic disease affecting about 23% of the European population with increasing prevalence rates. Beside classical symptoms (i.e. sneezing, nasal congestion), patients frequently complain about subjective impairments in cognitive functioning during periods of acute allergic inflammation. However, objective evidence for such deficits or the role of potential modulators and underlying mechanisms is limited. The present study aimed to investigate the effect of SAR on attention-related cognitive processes. In addition, relationships between attention

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Wang, Xigang, Zhiguo Meng, Si Chen, et al. "A Block-Scale FFT Filter Based on Spatial Autocorrelation Features of Speckle Noise in SAR Image." Remote Sensing 15, no. 1 (2022): 247. http://dx.doi.org/10.3390/rs15010247.

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In order to reduce the impact of noise on the accuracy of inversion products based on SAR images, many filtering algorithms have been developed for noise reduction of SAR images. This paper proposes a filtering method based on the spatial autocorrelation feature of the block fast Fourier transform (BFFT). The method statistically analyses the autocorrelation length of speckle noise on Sentinel-1B images for different features and then constructs a relationship between autocorrelation length and noise period. After that, the size of the optimal FFT filtering window radius was determined based o

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Kang, Hyein, Sewon Lee, and Minjae Lee. "A Three-Step Tapered Bit Period SAR ADC Using Area-Efficient Clock Generation." Electronics 12, no. 8 (2023): 1863. http://dx.doi.org/10.3390/electronics12081863.

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A three-step tapered bit period asynchronous successive approximation register (SAR) analog-to-digital converter (ADC) is proposed to reduce the total DAC settling time by 47.7% compared to the non-tapered conversion time with less design overhead. Unlike conventional approaches, the SAR settling time analysis with both reference buffer output impedance and hardware overhead is first analyzed in each conversion step, which demonstrates that the three-step tapered bit period approach is the most time- and hardware efficient in our design. Additionally, area-efficient three-step clock generation

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Jorge Ruiz, Jorge, Risto Vehmas, Juha Lemmetyinen, et al. "SodSAR: A Tower-Based 1–10 GHz SAR System for Snow, Soil and Vegetation Studies." Sensors 20, no. 22 (2020): 6702. http://dx.doi.org/10.3390/s20226702.

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We introduce SodSAR, a fully polarimetric tower-based wide frequency (1–10 GHz) range Synthetic Aperture Radar (SAR) aimed at snow, soil and vegetation studies. The instrument is located in the Arctic Space Centre of the Finnish Meteorological Institute in Sodankylä, Finland. The system is based on a Vector Network Analyzer (VNA)-operated scatterometer mounted on a rail allowing the formation of SAR images, including interferometric pairs separated by a temporal baseline. We present the description of the radar, the applied SAR focusing technique, the radar calibration and measurement stabilit

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Gadzic, Nebojsa. "Architecture in Sar Mountain villages." Facta universitatis - series: Architecture and Civil Engineering 15, no. 3 (2017): 277–94. http://dx.doi.org/10.2298/fuace160428025g.

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The development of settlements in the area of Sredacka, Sirinicka and Goranska parishes should be seen in the context of entire Sar Mountain, Kosovo and South-Western Balkans, where these high mountain parishes are located. We can record the development of settlements in these Sar Mountain parishes from its beginnings in this part of our country, since the Neolithic period, through the ancient and early Christian period, followed by the Middle Ages and up to the present day. There are visible traces of Pelasgic, Illyrian, Thracian, in some parts Hellenistic, Roman, Slavic and Turkish- Oriental

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14

Kowalczyk, Aleksandra. "In search of the beginnings of a foodsemic boom in the history of English." Studia Anglica Resoviensia 21 (December 30, 2024): 112–21. https://doi.org/10.15584/sar.2024.21.8.

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Food unquestionably plays a vital role in our lives, as it is essential for our day-to-day existence. It is multifacetedly mirrored in the way we picture the world and communicate with one another. Frequently, food names are deployed metaphorically/metonymically to conceptualize either human beings themselves and/or various aspects and features of their existence. Sometimes, such metaphors are analysed from a synchronic perspective, for example by Martsa (2001, 2013) and Kövecses (2002) and they are perceived as a means of communication. However, food metaphors may be analysed from a diachroni

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Barfuss, D. W., V. Ganapathy, and F. H. Leibach. "Evidence for active dipeptide transport in isolated proximal straight tubules." American Journal of Physiology-Renal Physiology 255, no. 1 (1988): F177—F181. http://dx.doi.org/10.1152/ajprenal.1988.255.1.f177.

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Transport of the dipeptide glycylsarcosine (Gly-Sar) was examined in isolated proximal straight tubules of the rabbit kidney by an in vitro microperfusion technique to determine whether it can be actively transported intact. The unidirectional lumen-to-bath flux of Gly-Sar was measured by two separate methods, namely its appearance rate (JA) in the bathing fluid and its disappearance rate (JD) from the luminal fluid. In addition, the cell Gly-Sar concentration was measured immediately after the last flux period. Mean luminal fluid Gly-Sar concentration was 0.22 mM. Transepithelial Gly-Sar flux

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Fors, A. S., C. Brekke, A. P. Doulgeris, T. Eltoft, A. H. H. Renner, and S. Gerland. "Late summer sea ice segmentation with multi-polarisation SAR features in C- and X-band." Cryosphere Discussions 9, no. 5 (2015): 4539–81. http://dx.doi.org/10.5194/tcd-9-4539-2015.

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Abstract. In this study we investigate the potential of sea ice segmentation by C- and X-band multi-polarisation synthetic aperture radar (SAR) features during late summer. Five high-resolution satellite SAR scenes were recorded in the Fram Strait covering iceberg-fast first-year and old sea ice during a week with air temperatures varying around zero degrees Celsius. In situ data consisting of sea ice thickness, surface roughness and aerial photographs were collected during a helicopter flight at the site. Six polarimetric SAR features were extracted for each of the scenes. The ability of the

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Rangzan, Moien, Sara Attarchi, Richard Gloaguen, and Seyed Kazem Alavipanah. "SAR Temporal Shifting: A New Approach for Optical-to-SAR Translation with Consistent Viewing Geometry." Remote Sensing 16, no. 16 (2024): 2957. http://dx.doi.org/10.3390/rs16162957.

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In contrast to the well-investigated field of Synthetic Aperture Radar (SAR)-to-Optical translation, this study explores the lesser-investigated domain of Optical-to-SAR translation, which is a challenging field due to the ill-posed nature of this translation. The complexity arises as single optical data can have multiple SAR representations based on the SAR viewing geometry. To generate an SAR image with a specific viewing geometry, we propose a novel approach, which is termed SAR Temporal Shifting. Our model takes an optical image from the target timestamp and an SAR image from a different t

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Nencioli, Francesco, and Graham D. Quartly. "Evaluation of Sentinel-3A Wave Height Observations Near the Coast of Southwest England." Remote Sensing 11, no. 24 (2019): 2998. http://dx.doi.org/10.3390/rs11242998.

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Due to the smaller ground footprint and higher spatial resolution of the Synthetic Aperture Radar (SAR) mode, altimeter observations from the Sentinel-3 satellites are expected to be overall more accurate in coastal areas than conventional nadir altimetry. The performance of Sentinel-3A in the coastal region of southwest England was assessed by comparing SAR mode observations of significant wave height against those of Pseudo Low Resolution Mode (PLRM). Sentinel-3A observations were evaluated against in-situ observations from a network of 17 coastal wave buoys, which provided continuous time-s

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Sanganalmath, Santosh K., Judit Barta, Nobuakira Takeda, Hideo Kumamoto, and Naranjan S. Dhalla. "Antiplatelet therapy mitigates cardiac remodeling and dysfunction in congestive heart failure due to myocardial infarctionThis article is one of a selection of papers published in the special issue Bridging the Gap: Where Progress in Cardiovascular and Neurophysiologic Research Meet." Canadian Journal of Physiology and Pharmacology 86, no. 4 (2008): 180–89. http://dx.doi.org/10.1139/y08-005.

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Antiplatelet agents such as sarpogrelate (SAR), a 5-hydroxytryptamine antagonist, and cilostazol (CIL), a phosphodiesterase-III inhibitor, are used in the management of peripheral vascular disease. In this study, we tested the hypothesis that both SAR and CIL prevent cardiac remodeling and improve cardiac function in congestive heart failure (CHF) due to myocardial infarction (MI). Post-MI rats (3 weeks after the occlusion of coronary artery) received either vehicle (MI+V, n = 36), SAR (MI+SAR; 5 mg·kg–1·day–1, n = 35) or CIL (MI+CIL; 5 mg·kg–1·day–1, n = 34) from day 21 to day 56. Sham-operat

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Gohil, Vaidehi S., Venu R. Shah, and Rujul P. Shukla. "Household secondary attack rate amongst the susceptible contacts of COVID-19 cases and its epidemiological profile: A retrospective study from central Gujarat, India." Journal of Family Medicine and Primary Care 13, no. 4 (2024): 1448–53. http://dx.doi.org/10.4103/jfmpc.jfmpc_1474_23.

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ABSTRACT Introduction: Secondary attack rate (SAR) is a proportion of primary contacts developing the diseases within the incubation period upon exposure to a primary case among the total susceptible household contacts. The epidemiological profile and SAR will help in understanding the transmission dynamics of COVID-19 for further strengthening preventive and effective control measures. Objectives of the Study: The study was conducted with the primary objective to estimate the household SAR of COVID-19 cases at Mahisagar District, Gujarat, and to study the epidemiological profile of primary an

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Nakamura, Mio, Kohki Okajima, Yoshio Matsumoto, Tomoki Tanaka, Katsuya Iijima, and Misato Nihei. "Effectiveness of Continuous Grip Strength Measurement Using Social Assistive Robots on Older Adults at Home." Journal of Robotics and Mechatronics 33, no. 4 (2021): 719–29. http://dx.doi.org/10.20965/jrm.2021.p0719.

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In this study, the effect of social assistive robots (SARs) on the continuity of health management activities was verified through the measurement of daily grip strength. We proposed and developed an intervention system for grip strength measurement and installed it in a SAR. Then, 23 older adults used the system at home with and without a SAR. Each setup was applied for three weeks and the rates at which the participants forgot their daily grip strength measurements were compared at the end of the period. The rates at which the daily measurements were forgotten decreased significantly when a

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Bachagha, Nabil, Wenbin Xu, Xingjun Luo, et al. "On the Discovery of a Roman Fortified Site in Gafsa, Southern Tunisia, Based on High-Resolution X-Band Satellite Radar Data." Remote Sensing 14, no. 9 (2022): 2128. http://dx.doi.org/10.3390/rs14092128.

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The increasing availability of multiplatform, multiband, very-high-resolution (VHR) satellite synthetic aperture radar (SAR) data has attracted the attention of a growing number of scientists and archeologists. In particular, over the last two decades, archeological research has benefited from SAR development mainly due to its unique ability to acquire scenes both at night and during the day under all weather conditions, its penetration capability, and the provided polarimetric and interferometric information. This paper explored the potential of a novel method (nonlocal (NL)-SAR) using TerraS

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Fors, Ane S., Camilla Brekke, Anthony P. Doulgeris, Torbjørn Eltoft, Angelika H. H. Renner, and Sebastian Gerland. "Late-summer sea ice segmentation with multi-polarisation SAR features in C and X band." Cryosphere 10, no. 1 (2016): 401–15. http://dx.doi.org/10.5194/tc-10-401-2016.

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Abstract. In this study, we investigate the potential of sea ice segmentation by C- and X-band multi-polarisation synthetic aperture radar (SAR) features during late summer. Five high-resolution satellite SAR scenes were recorded in the Fram Strait covering iceberg-fast first-year and old sea ice during a week with air temperatures varying around 0 °C. Sea ice thickness, surface roughness and aerial photographs were collected during a helicopter flight at the site. Six polarimetric SAR features were extracted for each of the scenes. The ability of the individual SAR features to discriminate be

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Zhang, Boya, Daniel Gann, Shimon Wdowinski, et al. "Space-Based Mapping of Pre- and Post-Hurricane Mangrove Canopy Heights Using Machine Learning with Multi-Sensor Observations." Remote Sensing 16, no. 21 (2024): 3992. http://dx.doi.org/10.3390/rs16213992.

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Coastal mangrove forests provide numerous ecosystem services, which can be disrupted by natural disturbances, mainly hurricanes. Canopy height (CH) is a key parameter for estimating carbon storage. Airborne Light Detection and Ranging (LiDAR) is widely viewed as the most accurate method for estimating CH but data are often limited in spatial coverage and are not readily available for rapid impact assessment after hurricane events. Hence, we evaluated the use of systematically acquired space-based Synthetic Aperture Radar (SAR) and optical observations with airborne LiDAR to predict CH across e

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Badger, Merete, Jake Badger, Morten Nielsen, Charlotte Bay Hasager, and Alfredo Peña. "Wind Class Sampling of Satellite SAR Imagery for Offshore Wind Resource Mapping." Journal of Applied Meteorology and Climatology 49, no. 12 (2010): 2474–91. http://dx.doi.org/10.1175/2010jamc2523.1.

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Abstract High-resolution wind fields retrieved from satellite synthetic aperture radar (SAR) imagery are combined for mapping of wind resources offshore where site measurements are costly and sparse. A new sampling strategy for the SAR scenes is introduced, based on a method for statistical–dynamical downscaling of large-scale wind conditions using a set of wind classes that describe representative wind situations. One or more SAR scenes are then selected to represent each wind class and the classes are weighted according to their frequency of occurrence. The wind class methodology was origina

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Papastergios, A., M. Chini, and I. Parcharidis. "SENTINEL-1 DATA TO MAP FLOODED AREAS: THE ROLE OF INSAR COHERENCE AND POLARIMETRIC INFORMATION." Bulletin of the Geological Society of Greece 50, no. 3 (2017): 1730. http://dx.doi.org/10.12681/bgsg.11896.

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SAR earth observation data can provide high quality flood maps and information to better assess the flood risk accordingly planning as well as to support civil protection authorities during emergency phase. The scope of this paper is to create flood extent maps from a series of SAR scenes of the Evros basin which represents a transboundary floodplain. The study uses time series SAR images of Sentnel-1 ESA’s Copernicus satellite system covering the period October 2014 to May 2015. The methodology tries to identify the flood that occurs in three main land cover classes, such as urban areas, bare

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Geng, Jiwen, Ze Yu, Chunsheng Li, and Wei Liu. "Squint Mode GEO SAR Imaging Using Bulk Range Walk Correction on Received Signals." Remote Sensing 11, no. 1 (2018): 17. http://dx.doi.org/10.3390/rs11010017.

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Geosynchronous synthetic aperture radar (GEO SAR) has the potential for conducting long-term observation of target zones, which is essential for remote sensing applications such as disaster monitoring and vegetation measurements. The squint imaging mode is crucial for long-term observation using GEO SAR. However, this type of SAR imaging is problematic because the squint mode introduces a nonzero range cell walk, which increases the prevalence of invalid data in echoes and intensifies the coupling between the azimuth and range. Therefore, this paper proposes a novel squint mode GEO SAR imaging

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Mikhalev, Aleksandr, and Aleksandr Beletsky. "Auroras during extreme geomagnetic storms: Visual observations of the SAR arc in Irkutsk during the 1859 Carrington event." Solar-Terrestrial Physics 11, no. 1 (2025): 44–48. https://doi.org/10.12737/stp-111202505.

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The paper analyzes the description in chronicles of the September 2, 1859 auroras observed in Irkutsk during the Carrington event. The description of the red arc by an eyewitness, the analysis of geomagnetic conditions, publications on visual observations of auroras of various forms at middle and low latitudes during this period, modern instrumental observations of SAR arcs at the latitude of Irkutsk have allowed us to assume that the red arc described in the chronicles is a SAR arc — one of the auroral types at subauroral and middle latitudes observed during geomagnetic storms. We have establ

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Bloch, Danielle, John Zicker, Hannah Somhegyi, Patrick Philips, Inder Singh, and Amy Daitch. "1214. Household Transmission of Febrile Illness Measured by Smartphone-Connected Thermometers, United States, 2016-2021." Open Forum Infectious Diseases 8, Supplement_1 (2021): S697. http://dx.doi.org/10.1093/ofid/ofab466.1406.

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Abstract Background Understanding household transmission dynamics of infectious diseases can help develop mitigation strategies. Traditional methods of population-level disease surveillance do not capture household transmission. Data collected from smartphone-connected thermometers that can differentiate among individuals in a household can be used to study these characteristics. Using this technology, we estimated the household secondary attack rate (SAR) of febrile illness, assessed its correlation with CDC-reported influenza-like illness (ILI) and COVID-19 case incidence, and identified ris

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Abonazel, Mohamed R. "Determinants of Per Capita Personal Income in the US: Spatial Fixed Effects Panel Data Modeling." Journal of Advanced Research in Applied Mathematics and Statistics 05, no. 1&2 (2020): 1–13. http://dx.doi.org/10.24321/2455.7021.202001.

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Over the last decades, the Per Capita Personal Income (PCPI) variable was a common measure of the effectiveness of economic development policy. Therefore, this paper is an attempt to investigate the determinants of personal income by using spatial panel data models for 48 U.S. states during the period from 2009 to 2017. We utilize the three following models: spatial autoregressive (SAR) model, Spatial Error (SEM) Model, and Spatial Autoregressive Combined (SAC) model, with individual (or spatial) fixe deffects according to three different known methods for constructing spatial weights matrices

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Cardoso-Gonçalves, Jorge, and José Tentúgal-Valente. "A Framework for Operational Management of Urban Water Systems to Improve Resilience." Water 16, no. 1 (2023): 154. http://dx.doi.org/10.3390/w16010154.

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Optimizing the management of hydraulic infrastructures that support water supply, wastewater, and stormwater drainage can increase the efficiency of these systems. A framework for operational management of urban water systems allows for robust management, which contributes to the system’s overall resilience. A methodology has been structured to support the decision-making process of managing entities. The methodology for the operational management of hydraulic infrastructures incorporates concepts of asset management, risk management, and technical management. It is organized into three operat

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Wang, W., X. Yang, G. Liu, et al. "RANDOM FOREST CLASSIFICATION OF SEDIMENTS ON EXPOSED INTERTIDAL FLATS USING ALOS-2 QUAD-POLARIMETRIC SAR DATA." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B8 (June 24, 2016): 1191–94. http://dx.doi.org/10.5194/isprs-archives-xli-b8-1191-2016.

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Coastal zones are one of the world’s most densely populated areas and it is necessary to propose an accurate, cost effective, frequent, and synoptic method of monitoring these complex ecosystems. However, misclassification of sediments on exposed intertidal flats restricts the development of coastal zones surveillance. With the advent of SAR (Synthetic Aperture Radar) satellites, polarimetric SAR satellite imagery plays an increasingly important role in monitoring changes in coastal wetland. This research investigated the necessity of combining SAR polarimetric features with optical data, and

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Zhang, Rui, Zhanzhong Tang, Dong Luo, Hongxia Luo, Shucheng You, and Tao Zhang. "Combined Multi-Time Series SAR Imagery and InSAR Technology for Rice Identification in Cloudy Regions." Applied Sciences 11, no. 15 (2021): 6923. http://dx.doi.org/10.3390/app11156923.

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The use of remote sensing technology to monitor farmland is currently the mainstream method for crop research. However, in cloudy and misty regions, the use of optical remote sensing image is limited. Synthetic aperture radar (SAR) technology has many advantages, including high resolution, multi-mode, and multi-polarization. Moreover, it can penetrate clouds and mists, can be used for all-weather and all-time Earth observation, and is sensitive to the shape of ground objects. Therefore, it is widely used in agricultural monitoring. In this study, the polarization backscattering coefficient on

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Wang, W., X. Yang, G. Liu, et al. "RANDOM FOREST CLASSIFICATION OF SEDIMENTS ON EXPOSED INTERTIDAL FLATS USING ALOS-2 QUAD-POLARIMETRIC SAR DATA." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B8 (June 24, 2016): 1191–94. http://dx.doi.org/10.5194/isprsarchives-xli-b8-1191-2016.

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Coastal zones are one of the world’s most densely populated areas and it is necessary to propose an accurate, cost effective, frequent, and synoptic method of monitoring these complex ecosystems. However, misclassification of sediments on exposed intertidal flats restricts the development of coastal zones surveillance. With the advent of SAR (Synthetic Aperture Radar) satellites, polarimetric SAR satellite imagery plays an increasingly important role in monitoring changes in coastal wetland. This research investigated the necessity of combining SAR polarimetric features with optical data, and

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Savastano, Salvatore, Paula Gomes da Silva, Jara Martínez Sánchez, et al. "Assessment of Shoreline Change from SAR Satellite Imagery in Three Tidally Controlled Coastal Environments." Journal of Marine Science and Engineering 12, no. 1 (2024): 163. http://dx.doi.org/10.3390/jmse12010163.

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Coasts are continually changing and remote sensing from satellites has the potential to both map and monitor coastal change at multiple scales. Unlike optical technology, synthetic aperture radar (SAR) is uninfluenced by darkness, clouds, and rain, potentially offering a higher revision period to map shoreline position and change, but this can only be feasible if we have a better interpretation of what shorelines as extracted from SAR imagery represent on the ground. This study aims to assess the application of shorelines extracted from SAR from publicly available satellite imagery to map and

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Hassan, M. M., K. Lias, N. Buniyamin, B. S. S. Naimullah, and A. T. Jobli. "SAR Performance of Rectangular Microstrip Antenna for Breast Cancer Hyperthermia Treatment with Different Period of Treatment Procedure." Journal of Physics: Conference Series 2071, no. 1 (2021): 012048. http://dx.doi.org/10.1088/1742-6596/2071/1/012048.

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Abstract Cancer treatment using hyperthermia techniques recently become the interest among researchers in investigating and improving certain deficiencies of the treatment since this treatment has the potential to denaturate cancer into necrotic tissue. Hyperthermia uses high heat from 41°C to 45°C at a certain period of time. It is difficult to control the focus position distance of heat distribution on the treated tissue. Therefore, this paper presents the rectangular microstrip as hyperthermia applicator, which deliver the heat on the targeted treated breast cancer tissue with different per

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Schmidt, Kersten, Núria Tous Ramon, and Marco Schwerdt. "Radiometric accuracy and stability of sentinel-1A determined using point targets." International Journal of Microwave and Wireless Technologies 10, no. 5-6 (2018): 538–46. http://dx.doi.org/10.1017/s1759078718000016.

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ABSTRACTSentinel-1A is a space-borne synthetic aperture radar (SAR) system developed in the frame of the Copernicus Program. The German Aerospace Center supported the radiometric and polarimetric calibration of Sentinel-1A by the analysis of point target responses of several acquisitions considering different modes, beams, and polarization channels. An elevation dependent bias, which had not been properly predicted by the used antenna model, was found for all investigated modes. Offsets of up to 2 dB were determined during the SAR instrument calibration phase, in particular, for low and high e

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Chonnaniyah, I. W. G. A. Karang, and T. Osawa. "Internal solitary waves propagation speed estimation in the northern-part of Lombok Strait observed by Sentinel-1 SAR and Himawari-8 images." IOP Conference Series: Earth and Environmental Science 944, no. 1 (2021): 012042. http://dx.doi.org/10.1088/1755-1315/944/1/012042.

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Abstract Remotely sensed data, both Synthetic Aperture Radar (SAR) and optical sensors, significantly contribute to the study and understanding internal solitary wave (ISW) dynamics in the ocean. Pairs of SAR and optical sensors were analyzed to estimate the ISW propagation speed in the northern-part of Lombok Strait. ISW propagation speed estimation used an image from Sentinel-1 SAR and three image pairs of Himawari-8 on 29 October 2018 with a time difference of 409 minutes. Sentinel-1 wide-swath imagery (250 km x 400 km) from two adjacent scenes can provide information on multiple ISW packet

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Zhao, Bingji, and Qingjun Zhang. "The Staring Mode Properties and Performance of Geo-SAR Satellite with Reflector Antenna." Remote Sensing 14, no. 7 (2022): 1609. http://dx.doi.org/10.3390/rs14071609.

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Geosynchronous synthetic aperture radar (Geo-SAR) with a short revisit time can obtain wide-area images. This paper advances a new two-dimensional pitch and roll squint controlling (2D-PRSC) method that can make satellites continuously stare at any scene in the whole orbital period. The maximum attitude steering angle is less than ±7.6 degrees, and the attitude controlling time can be greatly shortened compared with the yaw steering method. Furthermore, a Geo-SAR staring mode model is illustrated and compared with that of low earth orbital SAR (Leo-SAR). Finally, Geo-SAR’s ambiguity property i

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Mallafré-Larrosa, Meritxell, Mercè Herrero Garcia, Sergi Mendoza-Funes, et al. "SARS-CoV-2 Contacts’ Symptom Development and Secondary Attack Rate: A Retrospective Analysis of a Contact-Tracing Cohort in Catalonia." COVID 3, no. 4 (2023): 428–39. http://dx.doi.org/10.3390/covid3040032.

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Contact tracing outcome indicators, such as symptom development (SD) and secondary attack rate (SAR) among close contacts (CCs), are key to understanding SARS-CoV-2 transmission. This study analyses SD and SAR and estimates the incubation period (IP) from a cohort of 47,729 CCs from 17,679 SARS-CoV-2 cases diagnosed in Catalonia (Spain) from May to August 2020. Globally, 19.4% of the CCs reported symptoms, especially adult women living in urban areas. SAR was 24.5%, notably higher among infants (37.6%), and 45.9% of secondary cases (SCs) were asymptomatic. Household CCs had 98% (OR: 1.98, 95%

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Wan, Yong, Xiaona Zhang, Chenqing Fan, Ruozhao Qu, and Ennan Ma. "A Joint Method for Wave and Wind Field Parameter Inversion Combining SAR with Wave Spectrometer Data." Remote Sensing 14, no. 15 (2022): 3601. http://dx.doi.org/10.3390/rs14153601.

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Synthetic aperture radar (SAR) and wave spectrometer are common methods for observing the ocean wind field and waves on the sea surface, but both have limitations. Due to the influence of velocity bunching modulation, SAR wave observation is limited by the azimuth cut-off phenomenon. Meanwhile, SAR relies on an external wind direction source, so it is difficult for SAR to observe wind fields independently. There is no azimuthal cut-off phenomenon when the spectrometer observes the sea surface, but its azimuth resolution is much lower than SAR. Combining the above characteristics, the joint inv

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Meng, Haoran, Cunjun Li, Yu Liu, Yusheng Gong, Wanying He, and Mengxi Zou. "Corn Land Extraction Based on Integrating Optical and SAR Remote Sensing Images." Land 12, no. 2 (2023): 398. http://dx.doi.org/10.3390/land12020398.

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Corn is an important food crop worldwide, and its yield is directly related to Chinese food security. Accurate remote sensing extraction of corn can realize the rational application of land resources, which is of great significance to the sustainable development of modern agriculture. In the field of large-scale crop remote sensing classification, single-period optical remote sensing images often cannot achieve high-precision classification. To improve classification accuracy, multiple time series image combinations have gradually been adopted. However, due to the influence of cloudy and rainy

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Wen, Yuhao, Zhimin Zhang, Zhen Chen, Jinsong Qiu, Mingshan Ren, and Xiangrui Meng. "A Novel Time-Domain Frequency Diverse Array HRWS Imaging Scheme for Spotlight SAR." Remote Sensing 14, no. 5 (2022): 1085. http://dx.doi.org/10.3390/rs14051085.

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The frequency diverse array (FDA) technique is a novel scheme for high resolution wide swath synthetic aperture radar (SAR) imaging, which employs a frequency increment across the array elements. This introduces a range-angle-dependence to the transmission steering vector, which is exploited for range ambiguity resolution in strip-map SAR. Generally in spotlight mode, scatterers dispersively distributed in azimuth have different Doppler histories, in which the range ambiguity resolution for strip-map SAR fails. To extend the flexibility of FDA, in this paper a novel FDA imaging scheme for spot

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Shen, Wenjie, Yunzhen Jia, Yanping Wang, et al. "Spaceborne SAR Time-Series Images Change Detection Based on SAR-SIFT-Logarithm Background Subtraction." Remote Sensing 15, no. 23 (2023): 5533. http://dx.doi.org/10.3390/rs15235533.

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Synthetic Aperture Radar (SAR) image change detection aims to detect changes with images of the same area acquired at different times. It has wide applications in environmental monitoring, urban planning and resource management. Traditional change detection methods for spaceborne SAR time-series images typically adopt a pairwise comparison strategy to obtain multi-temporal change information. However, this kind of method has the problem of losing the overall change information, which is time consuming. To address this problem, this paper proposes a new change detection algorithm for spaceborne

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Kamala, Novi Syaifatun, and Muhammad Andryzal Fajar. "INDONESIAN CAPITAL MARKET REACTION TO COVID-19 AS A GLOBAL PANDEMIC." SAR (Soedirman Accounting Review) : Journal of Accounting and Business 5, no. 2 (2020): 120. http://dx.doi.org/10.20884/1.sar.2020.5.2.3507.

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This study aims to obtain empirical evidence of the absence of an average abnormal return, average volume trading activity, and bid-ask spread of stocks in the period around the event of the COVID-19 announcement as a global pandemic. The statement of the COVID-19 as the global pandemic of the World Health Organization (WHO) made the Indonesian capital market touch the lowest point at the level of 4,929.56. This study used the event study with the windows period for 11 days, which was five days before the announcement, the day of the announcement, and five days after the announcement. Th

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Widders, Irvin E. "Activation of Systemic Acquired Disease Resistance in Cucumber Seed during Germination." HortScience 31, no. 4 (1996): 569d—569. http://dx.doi.org/10.21273/hortsci.31.4.569d.

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Systemic acquired disease resistance (SAR) involves the activation of the natural physiological defense mechanisms against pathogen infection in a systemic manner within plants. A series of experiments were conducted in which `Beit Alpha' cucumber seed were treated with 2,6-dichloro-isonicotinic acid (INA) during osmotic conditioning or imbibition in water. Following germination and emergence, seedlings were challenge inoculated at the two-leaf stage with Colletotrichum lagenarium and incubated as a bioassay for expression of SAR. INA (289 μm) treatment of imbibed seeds reduced the number of a

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Han, Liusheng, Xiangyu Wang, Dan Li, et al. "A Novel Approach to Mapping the Spatial Distribution of Fruit Trees Using Phenological Characteristics." Agronomy 14, no. 1 (2024): 150. http://dx.doi.org/10.3390/agronomy14010150.

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The lack of high-spectral and high-resolution remote sensing data is impeding the differentiation of various fruit tree species that share comparable spectral and spatial features, especially for evergreen broadleaf trees in tropical and subtropical areas. Here, we propose a novel decision tree approach to map the spatial distribution of fruit trees at a 10 m spatial resolution based on the growth stage features extracted from Sentinel-1A (S-1A) time-series synthetic aperture radar (SAR) data. This novel method was applied to map the spatial distribution of fruit trees in Maoming City, which i

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Bukin, S. A., A. A. Kireyev, A. I. Ostanniy, A. V. Fedoseev, and Yu O. Fedorov. "Integration of the SAR Payload on Board of the Meteor-M No. 2-2 Spacecraft into the COSPAS–SARSAT International Search and Rescue System." Rocket-space device engineering and information systems 8, no. 2 (2021): 72–81. http://dx.doi.org/10.30894/issn2409-0239.2021.8.2.72.81.

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The present article addresses the results of the “Meteor-M” No. 2-2 SAR payload (RK–SM–MKA) commissioning campaign. The international effort was coordinated by Russia with the participation of technical teams from national administrations of the United States, Canada and France. In the course of testing, it was determined that the SAR payload performance was within technical expectations and that the SAR payload could be operationally used in the COSPAS–SARSAT system. Other matters of integrating the “Meteor-M” No. 2-2 (“Cospas-14” in Cospas-Sarsat terminology) SAR payload into the COSPAS–SARS

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Gasica, T. A., F. Bioresita, and A. Murtiyoso. "IDENTIFICATION OF TEMPORARY SURFACE WATER USING SENTINEL-1 SAR DATA, CASE STUDY: SENTANI FLASH FLOODING, INDONESIA." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2020 (August 21, 2020): 55–59. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2020-55-2020.

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Abstract. Temporary surface water monitoring can provide accurate and reliable information about the spatio-temporal level of surface water. This is very important for various environmental applications, such as flood monitoring. Remote sensing data such as Synthetic Aperture Radar (SAR) is very useful for a large-scale flood monitoring. SAR sensors offer clear advantages by providing their own sources of illumination, thus being able to operate in nearly all-weather/day-night conditions. About 30% disasters which occurred in Indonesia are floods. This hazard has become a recurring disaster th

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Wali, Emal, Masahiro Tasumi, and Masao Moriyama. "Combination of Linear Regression Lines to Understand the Response of Sentinel-1 Dual Polarization SAR Data with Crop Phenology—Case Study in Miyazaki, Japan." Remote Sensing 12, no. 1 (2020): 189. http://dx.doi.org/10.3390/rs12010189.

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This study investigated the relationship between backscattering coefficients of a synthetic aperture radar (SAR) and the four biophysical parameters of rice crops—plant height, green vegetation cover, leaf area index, and total dry biomass. A paddy rice field in Miyazaki, Japan was studied from April to July of 2018, which is the rice cultivation season. The SAR backscattering coefficients were provided by Sentinel-1 satellite. Backscattering coefficients of two polarization settings—VH (vertical transmitting, horizontal receiving) and VV (vertical transmitting, vertical receiving)—were invest

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