Pub Date : 2019-11-14DOI: 10.1109/IGARSS.2019.8899156
Yongchao Zhang, Deqing Mao, Y. Bu, Junjie Wu, Yulin Huang, A. Jakobsson
Stochastic radiation radar (SRR) systems allow for the forming of radar images by transmitting stochastic signals to form the stochastic radiation field and thereby increase the target observation information to achieve high resolution imaging. In this paper, we examine the use of the online SParse Iterative Covariance-based Estimation (SPICE) algorithm to suppress the noise and improve the operational efficiency. The SPICE algorithm is based on a weighted covariance fitting criterion, and has recently been generalized to allow for an improved reconstruction performance. The used online extension can take advantage of echoes non-correlation along time, allowing for updating the imaging result through successive echo sequences. The simulation results verify the superior performance of the resulting estimator as compared to other recent SRR imaging methods.
{"title":"Online High Resolution Stochastic Radiation Radar Imaging Using Sparse Covariance Fitting","authors":"Yongchao Zhang, Deqing Mao, Y. Bu, Junjie Wu, Yulin Huang, A. Jakobsson","doi":"10.1109/IGARSS.2019.8899156","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8899156","url":null,"abstract":"Stochastic radiation radar (SRR) systems allow for the forming of radar images by transmitting stochastic signals to form the stochastic radiation field and thereby increase the target observation information to achieve high resolution imaging. In this paper, we examine the use of the online SParse Iterative Covariance-based Estimation (SPICE) algorithm to suppress the noise and improve the operational efficiency. The SPICE algorithm is based on a weighted covariance fitting criterion, and has recently been generalized to allow for an improved reconstruction performance. The used online extension can take advantage of echoes non-correlation along time, allowing for updating the imaging result through successive echo sequences. The simulation results verify the superior performance of the resulting estimator as compared to other recent SRR imaging methods.","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"35 1","pages":"8562-8565"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82515670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-31DOI: 10.1109/IGARSS.2019.8898444
J. C. Merlano-Duncan, J. Querol, Adriano Camps, S. Chatzinotas, B. Ottersten
Phase, frequency and time synchronization is a crucial requirement for many applications as such as multi-static remote sensing and distributed beamforming for communications. The literature on the field is very wide, and in some cases, the requirements of the proposed synchronization solution may surpass the ones set by the application itself. Moreover, the synchronization solution becomes even more challenging when the nodes are flying or hovering on aerial or space platforms. In this work, we compare and classify the synchronization technologies available in the literature according to a common proposed framework, and we discuss the considerations of an implementation for distributed remote sensing applications. The general framework considered is based on a distributed collection of autonomous nodes that try to synchronize their clocks with a common reference. Moreover, they can be classified in non-overlapping, adjacent and overlapping frequency band scenarios.
{"title":"Architectures and Synchronization Techniques for Coherent Distributed Remote Sensing Systems","authors":"J. C. Merlano-Duncan, J. Querol, Adriano Camps, S. Chatzinotas, B. Ottersten","doi":"10.1109/IGARSS.2019.8898444","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8898444","url":null,"abstract":"Phase, frequency and time synchronization is a crucial requirement for many applications as such as multi-static remote sensing and distributed beamforming for communications. The literature on the field is very wide, and in some cases, the requirements of the proposed synchronization solution may surpass the ones set by the application itself. Moreover, the synchronization solution becomes even more challenging when the nodes are flying or hovering on aerial or space platforms. In this work, we compare and classify the synchronization technologies available in the literature according to a common proposed framework, and we discuss the considerations of an implementation for distributed remote sensing applications. The general framework considered is based on a distributed collection of autonomous nodes that try to synchronize their clocks with a common reference. Moreover, they can be classified in non-overlapping, adjacent and overlapping frequency band scenarios.","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"3 1","pages":"8875-8878"},"PeriodicalIF":0.0,"publicationDate":"2019-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79503952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-30DOI: 10.1109/IGARSS.2019.8900156
M. Sletten, Steven Menk, J. Toporkov
In this paper, we report initial results of an experimental investigation into measurement of ocean surface currents with an ultra high frequency synthetic aperture radar (UHF SAR) that supports an along-track interferometric (ATI) mode. We first describe the unique system, the NRL Multiband SAR, used to collect the data. We then present initial results related to two different approaches to current measurement. In the first approach, the surface current is estimated using standard ATI-SAR processing. We show progress in the implementation of this method with an interferometric phase cut across the north wall of the Gulf Stream. In the second, a time-sequence of images of propagating wave-like patterns is first generated using sub-aperture processing of the wide-beam, strip-map data, and this sequence is then transformed into wavenumber-frequency space through a 3D FFT. The surface current is then estimated from the displacement of the wave energy relative to the theoretical surface wave dispersion relation in the absence of any underlying current. We illustrate our progress in this approach with a wavenumber-frequency analysis of a 41-second sub-aperture image sequence of propagating waves.
{"title":"Ocean Surface Current Measurement with an Interferometric UHF SAR","authors":"M. Sletten, Steven Menk, J. Toporkov","doi":"10.1109/IGARSS.2019.8900156","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8900156","url":null,"abstract":"In this paper, we report initial results of an experimental investigation into measurement of ocean surface currents with an ultra high frequency synthetic aperture radar (UHF SAR) that supports an along-track interferometric (ATI) mode. We first describe the unique system, the NRL Multiband SAR, used to collect the data. We then present initial results related to two different approaches to current measurement. In the first approach, the surface current is estimated using standard ATI-SAR processing. We show progress in the implementation of this method with an interferometric phase cut across the north wall of the Gulf Stream. In the second, a time-sequence of images of propagating wave-like patterns is first generated using sub-aperture processing of the wide-beam, strip-map data, and this sequence is then transformed into wavenumber-frequency space through a 3D FFT. The surface current is then estimated from the displacement of the wave energy relative to the theoretical surface wave dispersion relation in the absence of any underlying current. We illustrate our progress in this approach with a wavenumber-frequency analysis of a 41-second sub-aperture image sequence of propagating waves.","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"6 1","pages":"98-101"},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81139686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-01DOI: 10.1109/IGARSS.2019.8900060
A. B. Rimba, S. Chapagain, Y. Masago, K. Fukushi, G. Mohan
Water remains a challenging issue for sustainable development. It remarks as the 6th goal of Sustainable Development Goals (SDGs) by the United Nations (UN). UN targeted to increase water-use efficiency across all sectors and ensure sustainable withdrawals and supply of freshwater to address water scarcity and substantially reduce the number of people suffering from water scarcity by 2030. Bali as the first tourism destination in Indonesia had received a huge water pressure from tourism activities and led the land use change. Land use change from 2000 to 2016 was analyzed by using Land Change Modeler (LCM), and data sources (Landsat 7 ETM+ and Landsat 8 OLI) were taken into account. This research depicted that tourism activities and undergoing land use land cover change and water demands in south part of Bali Island-Indonesia have challenged its sustainable development.
{"title":"Investigating Water Sustainability and Land Use/Land Cover Change (LULC) As the Impact Of Tourism Activity In Bali, Indonesia","authors":"A. B. Rimba, S. Chapagain, Y. Masago, K. Fukushi, G. Mohan","doi":"10.1109/IGARSS.2019.8900060","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8900060","url":null,"abstract":"Water remains a challenging issue for sustainable development. It remarks as the 6th goal of Sustainable Development Goals (SDGs) by the United Nations (UN). UN targeted to increase water-use efficiency across all sectors and ensure sustainable withdrawals and supply of freshwater to address water scarcity and substantially reduce the number of people suffering from water scarcity by 2030. Bali as the first tourism destination in Indonesia had received a huge water pressure from tourism activities and led the land use change. Land use change from 2000 to 2016 was analyzed by using Land Change Modeler (LCM), and data sources (Landsat 7 ETM+ and Landsat 8 OLI) were taken into account. This research depicted that tourism activities and undergoing land use land cover change and water demands in south part of Bali Island-Indonesia have challenged its sustainable development.","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"135 1","pages":"6531-6534"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75828169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-28DOI: 10.1109/IGARSS.2019.8898598
Wei-Cheng Zheng, Chia-Hsiang Lin, K. Tseng, Chih-Yuan Huang, T. Lin, Chia-Hsiang Wang, Chong-Yung Chi
Change detection (CD), enabled by multitemporal multispectral satellite imagery, has many important Earth observation missions such as land cover/use monitoring, for which we observe that change regions are relatively smaller than those caused by disaster (e.g., forest fire) with patterns typically composed of a number of smooth regions. These observations are considered in our new CD criterion, which can effectively mitigate the artifacts and speckle noise suffered by existing statistic-based and difference image (DI) analysis based methods. The proposed CD criterion amounts to a large-scale non-convex optimization, which is first reformulated using the convex relaxation trick with associated change map interpreted in the probability sense, followed by adopting an efficient convex solver known as alternating direction method of multipliers (ADMM). The resulted probabilistic change map would be more practical, and can be thresholded at 0.5 to yield the conventional binary-valued one. We also reveal a link between the proposed criterion and the DI-based criterion, and demonstrate the outstanding performance of our fully unsupervised CD algorithm qualitatively and quantitatively.
{"title":"Unsupervised Change Detection in Multitemporal Multispectral Satellite Images: A Convex Relaxation Approach","authors":"Wei-Cheng Zheng, Chia-Hsiang Lin, K. Tseng, Chih-Yuan Huang, T. Lin, Chia-Hsiang Wang, Chong-Yung Chi","doi":"10.1109/IGARSS.2019.8898598","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8898598","url":null,"abstract":"Change detection (CD), enabled by multitemporal multispectral satellite imagery, has many important Earth observation missions such as land cover/use monitoring, for which we observe that change regions are relatively smaller than those caused by disaster (e.g., forest fire) with patterns typically composed of a number of smooth regions. These observations are considered in our new CD criterion, which can effectively mitigate the artifacts and speckle noise suffered by existing statistic-based and difference image (DI) analysis based methods. The proposed CD criterion amounts to a large-scale non-convex optimization, which is first reformulated using the convex relaxation trick with associated change map interpreted in the probability sense, followed by adopting an efficient convex solver known as alternating direction method of multipliers (ADMM). The resulted probabilistic change map would be more practical, and can be thresholded at 0.5 to yield the conventional binary-valued one. We also reveal a link between the proposed criterion and the DI-based criterion, and demonstrate the outstanding performance of our fully unsupervised CD algorithm qualitatively and quantitatively.","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"14 1","pages":"1546-1549"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75115629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-28DOI: 10.1109/IGARSS.2019.8900531
S. Gunapala, C. Hill, A. D'Souza, C. Masterjohn, S. Babu, P. Ghuman, Sir Rafol, D. Ting, A. Soibel, A. Khoshakhlagh, S. Keo, B. Pepper, A. Fisher, E. Luong
In this presentation, we will report our recent efforts in achieving high performance in Antimonides type-II strained-layer superlattice (T2SLS) based infrared photodetectors using the barrier infrared detector (BIRD) device architecture. The recent emergence of barrier infrared detectors such as the nBn [1] and the XBn [2] have resulted in mid-wave infrared (MWIR) and long-wave infrared (LWIR) detectors with substantially higher operating temperatures than previously available in III-V semiconductor based MWIR and LWIR detectors. The initial nBn devices used either InAs absorber grown on InAs substrate, or lattice-matched InAsSb alloy grown on GaSb substrate, with cutoff wavelengths of ~3.2 µm and ~4 µm, respectively. While these detectors could operate at much higher temperatures than existing MWIR detectors based on InSb, their spectral responses do not cover the full (3 – 5.5 µm) MWIR atmospheric transmission window. There also have been nBn detectors based on the InAs/GaSb type-II superlattice absorber [3] .
在本报告中，我们将报告我们最近在使用屏障红外探测器(BIRD)器件架构实现基于Antimonides ii型应变层超晶格(T2SLS)的红外光电探测器的高性能方面所做的努力。最近出现的屏障红外探测器，如nBn[1]和XBn[2]，导致了中波红外(MWIR)和长波红外(LWIR)探测器，其工作温度比以前在III-V半导体基础上的MWIR和LWIR探测器高得多。初始nBn器件采用生长在InAs衬底上的InAs吸收体，或生长在GaSb衬底上的晶格匹配的InAsSb合金，截止波长分别为~3.2µm和~4µm。虽然这些探测器可以在比现有的基于InSb的MWIR探测器更高的温度下工作，但它们的光谱响应不能覆盖整个(3 - 5.5 μ m) MWIR大气透射窗口。也有基于InAs/GaSb ii型超晶格吸收剂的nBn探测器[3]。
{"title":"Long-Wavelength Infrared Digital Focal Plane Arrays for Earth Remote Sensing Applications","authors":"S. Gunapala, C. Hill, A. D'Souza, C. Masterjohn, S. Babu, P. Ghuman, Sir Rafol, D. Ting, A. Soibel, A. Khoshakhlagh, S. Keo, B. Pepper, A. Fisher, E. Luong","doi":"10.1109/IGARSS.2019.8900531","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8900531","url":null,"abstract":"In this presentation, we will report our recent efforts in achieving high performance in Antimonides type-II strained-layer superlattice (T2SLS) based infrared photodetectors using the barrier infrared detector (BIRD) device architecture. The recent emergence of barrier infrared detectors such as the nBn [1] and the XBn [2] have resulted in mid-wave infrared (MWIR) and long-wave infrared (LWIR) detectors with substantially higher operating temperatures than previously available in III-V semiconductor based MWIR and LWIR detectors. The initial nBn devices used either InAs absorber grown on InAs substrate, or lattice-matched InAsSb alloy grown on GaSb substrate, with cutoff wavelengths of ~3.2 µm and ~4 µm, respectively. While these detectors could operate at much higher temperatures than existing MWIR detectors based on InSb, their spectral responses do not cover the full (3 – 5.5 µm) MWIR atmospheric transmission window. There also have been nBn detectors based on the InAs/GaSb type-II superlattice absorber [3] .","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"197 1","pages":"8856-8859"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76334599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-28DOI: 10.1109/IGARSS.2019.8900652
S. Chan, R. Bindlish
In this paper, we explore a time series approach to using the tau-omega (τ-ω) model to retrieve vegetation water content (kg/m2) with minimal use of ancillary data. Analytically, this approach calls for nonlinear optimization in two steps. First, multiple days of co-located brightness temperature observations are used to retrieve the effective vegetation opacity, which incorporates the combined radiometric and polarization effects of surface roughness and vegetation opacity. The resulting effective vegetation opacity is then used to retrieve vegetation water content to within a gain factor α and an offset factor β. By using a climatological vegetation water content ancillary database as the one adopted in the development of the SMAP standard and enhanced soil moisture products, α and β can be determined globally using the annual minimum and annual maximum of vegetation water content. The resulting values of α and β can then be used to reconstruct the retrieved vegetation water content. Formulation, assumptions, and limitations of this approach are presented alongside the preliminary global retrieval of vegetation water content using one year (2016) of SMAP brightness temperature observations.
{"title":"Retrieval of Vegetation Water Content Using Brightness Temperatures from the Soil Moisture Active Passive (SMAP) Mission","authors":"S. Chan, R. Bindlish","doi":"10.1109/IGARSS.2019.8900652","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8900652","url":null,"abstract":"In this paper, we explore a time series approach to using the tau-omega (τ-ω) model to retrieve vegetation water content (kg/m2) with minimal use of ancillary data. Analytically, this approach calls for nonlinear optimization in two steps. First, multiple days of co-located brightness temperature observations are used to retrieve the effective vegetation opacity, which incorporates the combined radiometric and polarization effects of surface roughness and vegetation opacity. The resulting effective vegetation opacity is then used to retrieve vegetation water content to within a gain factor α and an offset factor β. By using a climatological vegetation water content ancillary database as the one adopted in the development of the SMAP standard and enhanced soil moisture products, α and β can be determined globally using the annual minimum and annual maximum of vegetation water content. The resulting values of α and β can then be used to reconstruct the retrieved vegetation water content. Formulation, assumptions, and limitations of this approach are presented alongside the preliminary global retrieval of vegetation water content using one year (2016) of SMAP brightness temperature observations.","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"317 1","pages":"5316-5319"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78383906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-28DOI: 10.1109/IGARSS.2019.8900288
C. Chatelard, I. Legoff, Guillaume Serra, Javier Sanchis Muñoz, J. Krapez, C. Mazel, Vincent Olichon, Juan Barba Polo, Y. Frédéric, F. Hélias, P. Barillot
Water leak detection in water transportation mains outside urban areas by airborne remote sensing has been assessed with a series of measurement campaigns in 2017 over SCP (Société du Canal de Provence – France) network in Provence (Fr). The most appropriate wavelengths and combination for revealing high moisture areas and artificial leaks coming from this image database (VNIR, SWIR, TIR spectral range) allowed us to select the best onboard instrumentation for both types of platforms (manned & unmanned). This work aims at validating the choice of this instrumentation associated with the multispectral approach (Triangle method) in the framework of a new airborne campaign in October 2018 with a plane and an UAV in operational environment.
{"title":"Leak Detection in Water Transmission Systems by Multispectral Remote Sensing With Airplane and UAV","authors":"C. Chatelard, I. Legoff, Guillaume Serra, Javier Sanchis Muñoz, J. Krapez, C. Mazel, Vincent Olichon, Juan Barba Polo, Y. Frédéric, F. Hélias, P. Barillot","doi":"10.1109/IGARSS.2019.8900288","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8900288","url":null,"abstract":"Water leak detection in water transportation mains outside urban areas by airborne remote sensing has been assessed with a series of measurement campaigns in 2017 over SCP (Société du Canal de Provence – France) network in Provence (Fr). The most appropriate wavelengths and combination for revealing high moisture areas and artificial leaks coming from this image database (VNIR, SWIR, TIR spectral range) allowed us to select the best onboard instrumentation for both types of platforms (manned & unmanned). This work aims at validating the choice of this instrumentation associated with the multispectral approach (Triangle method) in the framework of a new airborne campaign in October 2018 with a plane and an UAV in operational environment.","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"157 1","pages":"7124-7127"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77939045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-28DOI: 10.1109/IGARSS.2019.8898643
M. Zribi, M. Huc, Sebastian Antokoletz, M. L. Page, N. Pierdicca, N. Baghdadi
The main objective of this study is to propose an inversion algorithm for the estimation of soil moisture from CYGNSS data. The algorithm based on the change detection technique is applied to CYGNSS data after several corrections taking in account the incidence effects as well as different noises. The algorithm is validated on a one study site in North Africa. Comparisons with field data and ASCAT products illustrate a strong potential for CYGNSS products.
{"title":"Soil Moisture Estimation Using CYGNSS Constellation","authors":"M. Zribi, M. Huc, Sebastian Antokoletz, M. L. Page, N. Pierdicca, N. Baghdadi","doi":"10.1109/IGARSS.2019.8898643","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8898643","url":null,"abstract":"The main objective of this study is to propose an inversion algorithm for the estimation of soil moisture from CYGNSS data. The algorithm based on the change detection technique is applied to CYGNSS data after several corrections taking in account the incidence effects as well as different noises. The algorithm is validated on a one study site in North Africa. Comparisons with field data and ASCAT products illustrate a strong potential for CYGNSS products.","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"87 1","pages":"7014-7017"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90391832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-28DOI: 10.1109/IGARSS.2019.8897817
G. Manfredi, J. Ovarlez, L. Thirion-Lefevre
A preliminary Doppler analysis on a man walking in free space at 1 GHz is presented in this paper. Firstly, the back-scattered response of the moving target has been provided by a simulation tool based on physical optics (PO) theory. Then, a short-time Fourier transform (STFT), a reassignment spectrogram (RE-Spect) and a Wigner-Ville distribution (WVD) have been employed to the data, in order to characterize the micro-Doppler signature of the walking human body. The results are based entirely on numerical tests. The investigation on the time variations of the Doppler spectrum of moving targets at lower frequencies is of interest for the emerging radar applications devoted to the detection and tracking of people in highly cluttered environment.
{"title":"Features Extraction of the Doppler Frequency Signature of a Human Walking at 1 GHz","authors":"G. Manfredi, J. Ovarlez, L. Thirion-Lefevre","doi":"10.1109/IGARSS.2019.8897817","DOIUrl":"https://doi.org/10.1109/IGARSS.2019.8897817","url":null,"abstract":"A preliminary Doppler analysis on a man walking in free space at 1 GHz is presented in this paper. Firstly, the back-scattered response of the moving target has been provided by a simulation tool based on physical optics (PO) theory. Then, a short-time Fourier transform (STFT), a reassignment spectrogram (RE-Spect) and a Wigner-Ville distribution (WVD) have been employed to the data, in order to characterize the micro-Doppler signature of the walking human body. The results are based entirely on numerical tests. The investigation on the time variations of the Doppler spectrum of moving targets at lower frequencies is of interest for the emerging radar applications devoted to the detection and tracking of people in highly cluttered environment.","PeriodicalId":13262,"journal":{"name":"IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium","volume":"39 1","pages":"2260-2263"},"PeriodicalIF":0.0,"publicationDate":"2019-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84271208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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