- 标题
- 摘要
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- 实验方案
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - High Quality Isar Imaging for Target of Arbitrary Trajectory Based on Back Projection and Particle Swarm Optimization
摘要： When the target has large size or the target moves irregularly, traditional inverse synthetic aperture radar (ISAR) imaging method will lead to a poor image quality due to space variate and migration of echo envelop. In this paper, a novel method based on Back Projection (BP) and Particle Swarm Optimization (PSO) is proposed, which can achieve high quality images under the circumstances of irregular motion, large target and low signal to noise ratio (SNR). First, Target motion is modeled as a turntable, then the translational motion and rotational motion are modeled as two polynomials. Entropy of coherent superposition value of part of the imaging scene pixels based on BP algorithm is utilized as the evaluation function to estimate the polynomial coefficients based on an optimization algorithm such as PSO. Once the polynomial coefficients are estimated, a high quality image of the whole scene can be obtained by BP algorithm. The simulation results verify the effectiveness of the proposed method.
关键词： Back Projection (BP),particle swarm optimization (PSO),Inverse synthetic aperture radar (ISAR)
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Measurement of Vertical Deformation in Karachi Using Multi-Temporal Insar
摘要： Karachi is located on southernmost border of Pakistan along the Arabian Sea coast. Concerned institutions fear the occurrence of subsidence in the city, further contributing to the relative sea level rise. No direct measurement has been made so far about the subsidence rate and its contribution to city’s submergence risk. Our study presents first and preliminary results of vertical ground deformation measurement over this area using an advanced Temporarily Coherent Point InSAR technique using Envisat/ASAR and Sentinel-1A data. These datasets allowed us to study deformation in this area from 2004-2016, with some data gaps, thus providing a long-term analysis. Results show that various parts of the city are unstable and undergoing deformation of up to about 15 mm/yr. However, we could not find significant correlation between faults passing through the city and the deformation in its different parts. Future studies should focus on monitoring the deformation on a regular basis.
关键词： Synthetic Aperture Radar (SAR),multi-temporal,TCPInSAR,Interferometry,subsidence
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Afrisar-Tropisar: Forest Biomass Retrieval by P-Band Sar Tomography
摘要： The objective of this paper is to provide a better understanding of tomographic capabilities to estimate aboveground biomass (AGB) in dense forested areas at P-band. The analysis is carried out on airborne data acquired over sites in French Guyana and in Gabon during the ESA campaigns TropiSAR and AfriSAR 2015, respectively. Over both sites, P-band to-mography allows us to retrieve the vertical structure of the forest, to better characterize the ground and/or volume scattering mechanisms and to provide a unique solution for the AGB retrieval over the full range of biomass. The relationship between AGB and tomography data was found to be highly similar for forests across continents and sites: Paracou (French Guiana), Lope, Rabi and Mondah (Gabon). The developed metrics derived from the tomographic data have been found highly correlated to reference in situ AGB estimates (R2=0.85) and the root mean square error was 16% (for AGB ranging from 0 to 500 t/ha). These results have strong implications for the tomographic phase of the BIOMASS spaceborne mission.
关键词： BIOMASS mission,AfriSAR,Above Ground Biomass,P-band SAR tomography,forest,TropiSAR,forest vertical structure,Synthetic Aperture Radar
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Moving Target Detection and Tracking Based on Gmphd Filter in SAR System
摘要： In this paper, a novel moving target detection and tracking approach is presented based on Gaussian mixture probability hypothesis density (GMPHD) filter in synthetic aperture radar (SAR). Based on the advantages of GMPHD filter and the characteristics of moving target in SAR imagery, GMPHD filter is employed on potential moving target candidates extracted from a sequence of temporal and spatial sub-aperture SAR images to detect and track the moving targets in heavy clutter environment. Utilizing the tracking algorithm, the states and the number of moving targets are obtained over time. Simultaneously, the strong ground stationary clutter lacking of the dynamic behavior is eliminated finally. Both simulation and real Gotcha data set processing results are provided to demonstrate the effectiveness of the proposed approach.
关键词： Clutter suppression,Gaussian mixture probability hypothesis density (GMPHD) filter,Moving target tracking,Ground moving target indication (GMTI),Synthetic aperture radar (SAR)
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Polinsar and Tomographic Results Over the Gabonese Forest
摘要： The ESA-sponsored AfriSAR campaign took place in Gabon between 2015 and 2016. It was designed to collect data from tropical forests in order to support the future ESA-BIOMASS mission. This paper addresses the potential of P-band PolIn-SAR and tomography for retrieving vegetation parameters from the multi-baseline airborne data acquired by ONERA over the forest of Lopé. It is shown that a correction of phase disturbances (phase screens) is necessary. A correction procedure based on recent works from the litterature is applied. The PolInSAR and tomographic results are presented and compared with the available LIDAR data.
关键词： SAR Tomography,Phase Calibration,Multi-baseline Synthetic Aperture Radar,PolInSAR
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Multiband Circularly Polarized Synthetic Aperture Radar (CP-SAR) Onboard Microsatellite Constellation
摘要： Center for Environmental Remote Sensing, Chiba University develops multiband (L, C, and X bands) circularly polarized synthetic aperture radar (CP-SAR) for microsatellite SAR constellation (150 kg class). This paper explains the project, specification, antenna deployment, RF system, and ground-flight test of SAR system at Indonesia. In the future, this microsatellite SAR constellation will be employed to monitor global land deformation and environment.
关键词： Synthetic Aperture Radar,CP-SAR,Microsatellite constellation,Multiband,flight test
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Soil Moisture Estimation by Linear Regression from Smap Polarimetric Radar Data with Aquarius Derived Coefficients
摘要： Algorithms for soil moisture estimation from radars conventionally use substantial amounts of ancillary data to parametrize complex electromagnetic models. In contrast, we describe radar data of a vegetated scene as a linear function of soil moisture. This eliminates the dependence on ancillary data while providing reasonable global soil moisture estimates. We derive two polarization dependent coefficients of a linear model on the basis of spatial and temporal similarity at a global scale from nearly 4 years of L-band Aquarius radar and radiometer derived soil moisture data. These global coefficients are then used to derive soil moisture from 2.5 months of L-band SMAP radar data. The resulting soil moisture estimates are evaluated with the SMAP Level 2 radiometer-only soil moisture product.
关键词： Soil moisture,synthetic aperture radar (SAR),time series,polarimetric radar
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - The Capella Synthetic Aperture Radar Constellation
摘要： The Capella constellation will consist of 36 agile synthetic aperture radars. Each radar will operate at an altitude of around 500 km in an approximately 90-minute polar orbit, providing average imaging revisit times of less than one hour. The radars will be single-pol X-band systems, capable of operating over a 500 MHz bandwidth in stripmap and spotlight imaging modes.
关键词： radar constellation,synthetic aperture radar,mission concept
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Target Detection Based on Saliency Analysis and Contour Extraction for Synthetic Aperture Radar Images
摘要： Recently, saliency analysis is becoming a hotspot in target detection for remote sensing images. In this paper, a target detection model based on saliency analysis and contour extraction for synthetic aperture radar (SAR) images is proposed. First, we use the coherence-enhancing diffusion model to analyze the saliency of the input SAR image. The structure tensor and the diffusion tensor are employed to calculate the saliency map in this process. Then we combine the tensor voting algorithm and the active contour model, where the negative value of the curve saliency value calculated by the tensor vote is used as the external energy of the active contour model. Therefore, the contour of the target can be extracted accurately. Finally, the accurate and complete target region is obtained by the threshold segmentation algorithm. Experimental results show that the proposed model outperforms the relevant classical models.
关键词： tensor voting,saliency analysis,Remote sensing,target detection,synthetic aperture radar
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Signal Penetration of Low SAR Frequency Over Three Compact Polarimetric Modes
摘要： Compact polarimetry has the ability of reducing the complexity, cost, mass, and data rate of a SAR system while attempting to obtain many capabilities of quad polarisation systems. In this paper, we investigate the penetration of P-band signal and polarimetric degradation for the three compact polarimetric modes using two triangular trihedral corner reflectors, where one is immersed in the trees, and the other is outside the trees. The results from the π/4 mode showed a reduction of 0.6dB in the H channel while it was 2.28dB in the V channel. Also, the DCP mode showed a zero phase difference for the reflector outside the trees, while a 64.66? phase difference showed for the reflector immersed in the trees. Moreover, the reduction of signal was -30.4dB in the H channel, and it was 2.36dB in the V channel. Finally, the CRLT mode showed a similar signal reduction as the π/4 mode but the polarimetric degradation for the reflector immersed in the trees was 64.66?.
关键词： Synthetic Aperture Radar,Compact Polarimetry,Passive Point Targets,Radar Polarimetry
更新于2025-09-10 09:29:36