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2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)最新文献

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A Doppler parameter estimation method based on mismatched compression 一种基于错匹配压缩的多普勒参数估计方法
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7326819
Zhongyu Li, Junjie Wu, Yulin Huang, Zhichao Sun, Jianyu Yang, Xiaobo Yang
The ground moving target (GMT) model has been widely employed in modern coherent radar systems, such as the synthetic aperture radar (SAR) and the bistatic SAR (BiSAR). For the coherent radar systems, GMT imaging necessitates the compensation of the additional azimuth modulation without a priori knowledge of the GMT's motion parameters. That is to say, it is necessary to estimate the Doppler parameters of the GMT before the azimuth compression processing. For conventional estimation methods, such as the map drift (MD) method and the phase gradient auto-focus (PGA) method, a searching procedure is necessary and leads to an expensive computational cost. In this paper, a Doppler parameter estimation method based on mismatched compression is proposed. One advantage of this method is that it doesn't need the searching procedure. In addition, another advantage of this method is that both the Doppler centroid and the Doppler frequency rate of the GMT can be simultaneously estimated according to the relationships among the Doppler parameters, the positional offset and the boarding width of the mismatched imaging result. The theoretical analysis and numerical simulations validate that the proposed method works well with different signal to noise ratio.
地面运动目标模型在合成孔径雷达(SAR)和双基地雷达(BiSAR)等现代相干雷达系统中得到了广泛的应用。对于相干雷达系统,GMT成像需要补偿额外的方位调制,而不需要事先知道GMT的运动参数。也就是说,在进行方位角压缩处理之前,需要对GMT的多普勒参数进行估计。对于传统的估计方法,如地图漂移(MD)方法和相位梯度自动聚焦(PGA)方法,需要一个搜索过程,并且计算成本很高。提出了一种基于错匹配压缩的多普勒参数估计方法。这种方法的一个优点是不需要搜索过程。此外,该方法的另一个优点是,根据多普勒参数与错配成像结果的位置偏移和登机宽度之间的关系,可以同时估计出GMT的多普勒质心和多普勒频率率。理论分析和数值仿真验证了该方法在不同信噪比下都能取得良好的效果。
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引用次数: 2
Evaluation and comparison of atmospheric CO2 concentrations from models and satellite retrievals 基于模式和卫星反演的大气CO2浓度的评估和比较
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7326242
Yingying Jing, Jiancheng Shi, Tianxing Wang
In recent years, global warming caused by increased atmospheric CO2 has greatly drawn widespread attention from the public. Although satellite observations and model-simulation offer us two effective approaches to monitor and assess the global atmospheric CO2, quantification of the differences between these two different CO2 data is not fully investigated yet. In this paper, these CO2 products including satellite observations and model-simulation are inter-compared in terms of magnitude and their spatiotemporal distributions. The results reveal that these CO2 data from different data source show a good agreement all over the world, whereas many discrepancies still exist between satellite observations and model-simulation, especially in the Northern Sphere.
近年来,大气中二氧化碳增加引起的全球变暖已经引起了公众的广泛关注。虽然卫星观测和模式模拟为我们提供了监测和评估全球大气二氧化碳的两种有效方法,但对这两种不同的二氧化碳数据之间的差异进行量化的研究还没有得到充分的研究。本文将这些CO2产品包括卫星观测和模式模拟,在量级和时空分布方面进行了相互比较。结果表明,不同数据源的CO2数据在全球范围内具有较好的一致性,但卫星观测与模式模拟之间仍存在许多差异,特别是在北半球。
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引用次数: 0
Developing a method for urban damage mapping using radar signatures of building footprint in SAR imagery: A case study after the 2013 Super Typhoon Haiyan 基于SAR影像中建筑足迹雷达特征的城市损害制图方法研究——以2013年超强台风“海燕”为例
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7326595
B. Adriano, E. Mas, S. Koshimura, H. Gokon, Wen Liu, M. Matsuoka
In this study, a practical methodology was presented to map damaged buildings using high resolution synthetic aperture radar (SAR) images and post-event building damage data from the 2013 Super Typhoon Haiyan, in Tacloban city, the Philippines. To detect destroyed structures, we focused on the changes in the radar signal within footprints of buildings between pre- and post-event SAR images. The method was tested using a 1.0 m resolution COSMO-SkyMed SAR images taken over Tacloban city, the Philippines. The method proves, with 73% accuracy in this case, to be suitable for estimating destroyed buildings.
在这项研究中,提出了一种实用的方法,利用高分辨率合成孔径雷达(SAR)图像和2013年超强台风“海燕”在菲律宾塔克洛班市的灾后建筑受损数据绘制受损建筑地图。为了检测被破坏的建筑物,我们将重点放在建筑物足迹内雷达信号在事件前后SAR图像之间的变化上。该方法使用在菲律宾塔克洛班市拍摄的1.0 m分辨率cosmos - skymed SAR图像进行了测试。结果表明,该方法适用于被毁建筑物的估计,准确率为73%。
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引用次数: 3
Target location based on time focusing of time-reveral retransmitting signals 基于时变重传信号时间聚焦的目标定位
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7326485
Yuan-Qi Li, M. Xia
A new time-reversal imaging method based on the time focusing is presented. The time focusing behavior of the retransmitted time-reversal back-propagating waves from the time-reversal mirror (TRM) at a single target position is extended to multi target positions by using a grouping technique that divides the receiving array as a group of sub-arrays. The number of targets can exceed that of either the transmitters or the receivers. Locally normalized schemes can be employed to favor farer or weaker targets that may be swamped by nearer or stronger targets.
提出了一种基于时间聚焦的时间反转成像方法。采用将接收阵列分成一组子阵列的分组技术,将从时间反转镜(TRM)在单目标位置重传的时间反转反向传播波的时间聚焦特性扩展到多目标位置。目标的数量可以超过发射器或接收器的数量。局部归一化方案可用于支持可能被较近或较强目标淹没的较远或较弱目标。
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引用次数: 0
Semantic retrieval for remote sensing images using association rules mining 基于关联规则挖掘的遥感图像语义检索
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7325812
Jun Liu, Shuguang Liu
Since the properties of temporal and spatial complexity and mass diversity that remote sensing image data owns, remote sensing image retrieval becomes an international advanced frontier scientific issue in remote sensing. Content-based image retrieval technology is currently widely used; however, the difference between low-level features and high-level semantics, named semantic gap, becomes a difficult while important issue for remote sensing image retrieval. In this paper, a novel semantic retrieval method for remote sensing images using association rules mining is presented. Unlike the traditional content-based image retrieval methods, association rules are mined and used to express the semantic information of images instead of low-level features. The original image is firstly segmented into many objects; and then the classified association rules between the properties of objects are mined and transformed to semantic information by semantic annotation method; finally the semantic retrieval is achieved using the similarity measurement approach. The experimental results indicate that the proposed method can provide better retrieval performance than the existing content-based image retrieval methods.
由于遥感图像数据具有时空复杂性和海量多样性的特性,遥感图像检索成为遥感领域国际先进的前沿科学问题。基于内容的图像检索技术目前应用广泛;然而,低层特征与高层语义之间的差异,即语义差距,成为遥感图像检索的一个重要而又困难的问题。提出了一种基于关联规则挖掘的遥感图像语义检索方法。与传统的基于内容的图像检索方法不同,挖掘关联规则并使用关联规则来表达图像的语义信息,而不是低级特征。首先将原始图像分割成多个目标;然后,利用语义标注方法挖掘对象属性之间的分类关联规则,并将其转化为语义信息;最后利用相似度度量方法实现语义检索。实验结果表明,该方法比现有的基于内容的图像检索方法具有更好的检索性能。
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引用次数: 3
NASA D3R linear depolarization ratio observations and a new estimation technique NASA D3R线性去极化比观测及一种新的估计技术
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7325909
R. Beauchamp, V. Chandrasekar, M. Vega
The polarimetric radar parameter, linear depolarization ratio (LDR), provides microphysical insight into a scattering volume, particularly for mixed-phase and ice particles. A new estimator for improved estimation of LDR is presented. The NASA dual-frequency, dual-polarization, Doppler radar (D3R), which was recently upgraded to support operational linear depolarization ratio observations, was used as a testbed for evaluation of the new estimator. With D3R's Ku-band observations, the new LDR estimator is compared to conventional estimators and it is demonstrated that the new estimator is insensitive to attenuation, a number of radar system biases, and has increased immunity to noise for low SNR observations.
极化雷达参数线性退极化比(LDR)提供了对散射体积的微观物理洞察,特别是对混合相粒子和冰粒。提出了一种改进LDR估计的新估计器。NASA双频双极化多普勒雷达(D3R)最近被升级为支持业务线性去极化比观测,被用作评估新估计器的测试平台。利用D3R的ku波段观测数据,将新的LDR估计器与传统估计器进行了比较,结果表明,新的估计器对衰减、雷达系统偏差不敏感,并且对低信噪比观测具有更高的抗噪声能力。
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引用次数: 0
An intercomparison of the spatial-temporal characteristics of SMOS and AMSR-E soil moisture products over Mongolia plateau 蒙古高原SMOS和AMSR-E土壤水分产品时空特征对比
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7325855
X. Wen, Hui Lu, Chengwei Li
In this study, we inter-compared the spatial-temporal characteristics of SMOS and AMSR-E soil moisture products over Mongolia plateau. The results show that in temporal scale, the standard deviation of SMOS soil moisture data is higher than JAXA and ECMWF products, comparable to the in situ observation. To demonstrate the spatial variation of SMOS and JAXA soil moisture products, we first defined the smoothness index (SSI). The mean and maximum value of SSI of SMOS are much higher than those of JAXA and ECMWF for both daily and monthly soil moisture products. The mean value of SSI of daily SMOS products is 1.284, while that of JAXA and ECMWF is 0.010 and 5.010@10-4, respectively. For monthly products, the mean value of SSI of SMOS is 0.264, while the value of JAXA is 0.004, and 3.753*10-4 for ECMWF. Further, we counted the SSI of SMOS and JAXA TB, and the SSI mean value of SMOS TB is higher than that of JAXA TB for both daily and monthly time scale. It indicates that the big uncertainty of SMOS soil moisture products may raises from the unstable TB observation, which is highly contaminated by RFI and even cannot be removed at monthly scale.
本研究对蒙古高原SMOS和AMSR-E土壤水分产品的时空特征进行了对比。结果表明:在时间尺度上,SMOS土壤湿度数据的标准偏差高于JAXA和ECMWF产品,与现场观测结果相当;为了展示SMOS和JAXA土壤水分产品的空间变化,我们首先定义了平滑指数(SSI)。SMOS的日、月土壤水分产品SSI均值和最大值均远高于JAXA和ECMWF。SMOS日产品的SSI平均值为1.284,JAXA和ECMWF的SSI平均值分别为0.010和5.010@10-4。月度产品SMOS的SSI平均值为0.264,JAXA的SSI平均值为0.004,ECMWF的SSI平均值为3.753*10-4。此外,我们对SMOS和JAXA TB的SSI进行了统计,SMOS TB的SSI平均值在日和月时间尺度上都高于JAXA TB。这表明SMOS土壤水分产品的不确定性很大,可能是由于TB观测不稳定,受RFI污染严重,甚至无法在月尺度上消除。
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引用次数: 3
Joint dictionary learning with ridge regression for pansharpening 基于岭回归的联合字典学习pansharpening
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7325838
Songze Tang, Liang Xiao, Bushra Naz, Pengfei Liu, Yufeng Chen
A novel pansharpening method is proposed for creating a fused image of high spatial and spectral resolutions through merging a panchromatic (PAN) image with a multispectral (MS) image. To replace the patch pairs sampled from the images directly as the dictionary pairs, a joint learning model is proposed to learn a pair of compact dictionaries. Meanwhile, instead of restricting the coding coefficients of low resolution (LR) MS and high resolution (HR) MS image patches to be equal, ridge regression model is employed to describe their relation. Then, the fused MS image is calculated by combining the mapped sparse coefficients and the dictionary for the HR MS image. By comparing with some well-known methods in terms of several universal quality evaluation indexes, the simulated experimental results demonstrate the superiority of our method.
提出了一种新的泛锐化方法,通过将全色(PAN)图像与多光谱(MS)图像合并,生成高空间分辨率和光谱分辨率的融合图像。为了取代从图像中直接采样的patch对作为字典对,提出了一种联合学习模型来学习一对紧凑字典。同时,不限制低分辨率(LR) MS和高分辨率(HR) MS图像补丁的编码系数相等,而是采用脊回归模型来描述它们之间的关系。然后,将映射的稀疏系数与HR MS图像字典相结合,计算融合后的MS图像;通过对几种通用质量评价指标与一些知名方法的比较,仿真实验结果表明了本文方法的优越性。
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引用次数: 1
Detection of ground moving targets via MIMO SAR systems 利用MIMO SAR系统探测地面运动目标
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7326972
P. Lombardo, D. Pastina, Fabrizio Turin
Multichannel space-based SAR systems that exploit receiving antenna sub-arrays displaced in the along track-direction have been shown to provide the capability to detect ground moving targets and potentially estimate their radial motion velocity, thus making possible their correct relocation inside the SAR image of the background. However, the use of only two receiving channels to contain cost, mass and data-rate, imposes limitations in terms of potentiality of joint clutter cancellation and target velocity estimation. To overcome this problem we propose a full MIMO SAR scheme obtained by transmitting nearly orthogonal waveforms with the two sub-arrays achieved from a single antenna aperture, and receiving with the two sub-arrays. A complete processing chain for the joint detection, imaging and radial speed estimation is presented and the performance of the proposed MIMO system is deeply investigated and compared to the performance of conventional multichannel systems to assess the relative merits and drawbacks.
利用沿轨迹方向偏移的接收天线子阵列的多通道天基SAR系统已被证明可以提供探测地面移动目标的能力,并可能估计其径向运动速度,从而使其在背景SAR图像内的正确定位成为可能。然而,仅使用两个接收信道来控制成本、质量和数据速率,在联合杂波消除和目标速度估计方面施加了限制。为了克服这一问题,我们提出了一种全MIMO SAR方案,该方案通过从单个天线孔径获得的两个子阵列发射近正交波形,并使用两个子阵列接收。提出了一个完整的联合检测、成像和径向速度估计的处理链,并对所提出的MIMO系统的性能进行了深入研究,并与传统多通道系统的性能进行了比较,以评估其相对优点和缺点。
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引用次数: 1
A benchmark for scene classification of high spatial resolution remote sensing imagery 高空间分辨率遥感影像场景分类的基准
Pub Date : 2015-07-26 DOI: 10.1109/IGARSS.2015.7326956
Jingwen Hu, Tianbi Jiang, Xinyi Tong, Gui-Song Xia, Liangpei Zhang
Scene classification for high-resolution remotely sensed imagery have been widely investigated in recent years. However, there is few public, widely accepted and large scale dataset for benchmarking different methods. This paper presents a new and large dataset consisting of 5000 high-resolution remote sensing images which is manually labeled in 20 semantic classes for scene classification. Each class includes more than 200 image samples with different appearances. Some classic classification algorithms are compared on this dataset. To our knowledge, this work is the first time to give a public benchmark dataset at this size on the problem of scene classification in high-resolution remote sensing imagery, and give comparative results and analysis of various classic classification algorithms.
近年来,高分辨率遥感影像的场景分类问题得到了广泛的研究。然而,很少有公开的、被广泛接受的、大规模的数据集来对不同的方法进行基准测试。本文提出了一个新的大型数据集,该数据集由5000幅高分辨率遥感图像组成,人工标记为20个语义类,用于场景分类。每个类包括200多个不同外观的图像样本。在此数据集上比较了几种经典的分类算法。据我们所知,本工作是第一次针对高分辨率遥感图像场景分类问题给出如此规模的公开基准数据集,并对各种经典分类算法进行对比和分析。
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引用次数: 20
期刊
2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
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