نتایج جستجو برای: sar

تعداد نتایج: 17700  

2006
Craig Rodarmel

Many applications require the ability to use airborne sensor data to perform accurate geopositioning. Synthetic Aperture Radar’s (SAR) ability to image from long distances and in poor weather makes it advantageous for such geopositioning. However, the ability to accurately position using SAR data is reliant on having accurate sensor support data (sensor position, velocity, etc...). This paper e...

2002
Heiko Balzter Ruth Cox Clare Rowland Paul Saich

The CORSAR project (Carbon Observation and Retrieval from SAR), which is supported by the UK Natural Environment Research Council (NERC), has the objective to examine polarimetric decomposition and polarimetric SAR interferometry methods for estimating the effects of canopy structure in biomass-backscatter relationships. Forest canopy height is a useful input parameter to yield models, carbon c...

2013
Marc J. Champigny Marisa Isaacs Philip Carella Jennifer Faubert Pierre R. Fobert Robin K. Cameron

DIR1 is a lipid transfer protein (LTP) postulated to complex with and/or chaperone a signal(s) to distant leaves during Systemic Acquired Resistance (SAR) in Arabidopsis. DIR1 was detected in phloem sap-enriched petiole exudates collected from wild-type leaves induced for SAR, suggesting that DIR1 gains access to the phloem for movement from the induced leaf. Occasionally the defective in induc...

2005
Yongwei Sheng

SAR mosaics are often not precisely geo-referenced because topographic distortions were not removed during the mosaicking process due to the lack of adequate digital elevation models (DEMs). The Shuttle Radar Topography Mission (SRTM) has recently provided high-resolution DEM data with nearly global coverage, and makes it possible to geo-rectify SAR mosaics. Though techniques are available for ...

1996
Peter G. Meisl Mabo Robert Ito Ian G. Cumming

Synthetic Aperture Radar (SAR) signal processing poses a significant challenge due to its very large computation and data storage requirements. This paper presents the computational requirements of a typical high resolution satellite SAR data processing scenario. A classification of approaches to partitioning the SAR problem for parallel processing is given. The suitabilityof Networks of Workst...

2007
UWE STILLA

New synthetic aperture radar (SAR) sensors on satellites like TerrsSAR-X allow flexible mapping with a large coverage or a high resolution of about one meter. Leading-edge airborne SAR sensors provide spatial resolutions on the order of a decimetre. In such data, many features of urban objects can be identified, which were beyond the scope of radar remote sensing before. But, SAR images are oft...

2001
Yunjin Kim

It is necessary to calibrate SAR data in order to use the data for science applications. When both polarimetric and interferometric data are collected simultaneously, these SAR data can be used for cross-calibration and verification. The frequency of polarimetric and interferometric data does not have to be the same for this purpose. For example, the NASA/JPL AIRSAR system can acquire C-band in...

Journal: :IEEE Trans. Geoscience and Remote Sensing 2003
Carlos López-Martínez Xavier Fàbregas

Synthetic aperture radar (SAR) data are affected by speckle noise, originated by the SAR system’s coherent nature. The problem of speckle noise in one-dimensional (1-D) data is already solved, as speckle has a multiplicative characteristic. SAR polarimetry represents an extension to multidimensional data by the use of polarization wave diversity. As a consequence of the existence of a correlati...

2015
Philip Carella Daniel C Wilson Robin K Cameron

Systemic acquired resistance (SAR) is a plant defense response in which an initial localized infection affords enhanced pathogen resistance to distant, uninfected leaves. SAR requires efficient long-distance signaling between the infected leaf, where SAR signals are generated, and the distant uninfected leaves that receive them. A growing body of evidence indicates that the lipid transfer prote...

Journal: :Pattern Recognition 2003
Bir Bhanu Yingqiang Lin

Recognition of occluded objects in synthetic aperture radar (SAR) images is a signi0cant problem for automatic target recognition. Stochastic models provide some attractive features for pattern matching and recognition under partial occlusion and noise. In this paper, we present a hidden Markov modeling based approach for recognizing objects in SAR images. We identify the peculiar characteristi...

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