A5083882080- Synthetic Aperture Radar (SAR) Applications and Techniques
- Precipitation Measurement and Analysis
- Soil Moisture and Remote Sensing
- Advanced SAR Imaging Techniques
- Ocean Waves and Remote Sensing
- Radio Wave Propagation Studies
- Meteorological Phenomena and Simulations
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Geomagnetism and Paleomagnetism Studies
- Electromagnetic Scattering and Analysis
- Radar Systems and Signal Processing
- Geophysical Methods and Applications
- Microwave Imaging and Scattering Analysis
- Methane Hydrates and Related Phenomena
- Atmospheric aerosols and clouds
- Scientific Research and Discoveries
- Fault Detection and Control Systems
- Antenna Design and Optimization
- Statistical and numerical algorithms
- Infrared Target Detection Methodologies
- Remote-Sensing Image Classification
- CCD and CMOS Imaging Sensors
- Brain Tumor Detection and Classification
Fraunhofer Institute for High Frequency Physics and Radar Techniques
2012-2023
Fraunhofer Society
2015
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2005-2011
TerraSAR-X, the first civil German synthetic aperture radar (SAR) satellite, was successfully launched on June 15, 2007. After 4.5 days, processed image obtained. The overall quality of outstanding; however, suspicious features could be identified which showed precipitation-related signatures. These rain-cell signatures are thoroughly investigated, and physical background related propagation effects is provided. In addition, from former missions like SIR-C/X Shuttle Radar Topography Mission...
In this paper we propose some ionospheric correction schemes for space-borne synthetic aperture radar (SAR) and polarimetric interferometric SAR (PolInSAR). The spatial temporal variation of the free electron density in uppermost atmosphere affects propagation pulse resulting image distortions. We estimate total content (TEC) by applying Appleton-Hartree equation to distortions focusing, polarimetry, interferometry. Then a combined estimator that yields comprehensive differential TEC...
SIGNAL is an innovative earth exploration mission proposal with the main objective to estimate accurately and repeatedly topography topographic changes associated mass change or other dynamic effects on glaciers, ice caps polar sheets. Elevation measurements are complemented glacier velocity measurements, providing valuable additional information for a better understanding of hydrology glacierized basins Arctic Antarctic water cycle. capable monitoring all critical regions high spatial...
This contribution reports about experimental activities during the 2011 Squirrel campaign in Baltic Sea, where a number of in- and outbound runs Mittelgrund research vessel were measured by Fraunhofer FHR MEMPHIS Radar sea configuration at both Ka W band. Aboard employed vessel, four corner-reflectors (CR) different heights forward backward direction mounted order to measure signature CRs along inbound- trajectories. The parabolic wave equation modeling software TERPEM was used model...
To predict the performance of coastal and shipborne radars, it is essential to assess propagation characteristics electromagnetic waves in maritime boundary layer. be independent upon environmental measurements, which are generally not as precise reliable they have for a proper input simulation programs, usually based parabolic equation models, method retrieve refractive index gradients low troposphere Refractivity from Clutter (RFC) algorithm. The factor computed received clutter power...
Results of a coastal measurement campaign called MediterraneAn Rfc and cLutter ENvironmental Experiment (MARLENE) are presented studied. The was held in spring 2014, on DGA site the Mediterranean Sea region Toulon, France. Three radar systems, Millimeter wave Experimental Multifrequency Polarimetric High Resolution Interferometric System (Fraunhofer FHR), MARSIG (WTD 71), MEDYCIS (ONERA), were deployed to simultaneously acquire sea clutter measurements. During campaign, situ oceanic...
This paper describes an experiment that was carried out in the North Sea off Sylt island May 2012 with aim to study influence of maritime boundary layer conditions on propagation radar signals under low grazing angle geometry and establish a sea clutter database at different frequencies view contribute new models. The measurements were highly versatile called MEMPHIS operating configuration X-, Ka-, W-band, simultaneously. As concerns oceanographic atmospheric characterization, collection...
In the maritime boundary layer, air-sea interaction processes have an important impact on radar propagation. The range performance near sea surface depends meteorological and conditions. Strong gradients of humidity temperature close to air-water interface are most often reason for propagation effects such as ducting. For ship borne radars evaporation duct is dominant mechanism affecting maximum detection range. Ducting can also increase clutter return within beyond geometric horizon. Duct...
TerraSAR-X, the first civil German synthetic aperture radar (SAR) satellite has been successfully launched in 2007, June 15 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> . After 4.5 days processed image obtained. The overall quality of was outstanding, however, suspicious features could be identified which showed precipitation related signatures. These rain-cell signatures motivated a further in-depth study physical background...
Propagation above the sea surface depends on many parameters related to meteorological and oceanographic conditions, measurement geometry system parameters. In this contribution we report an experiment performed at Gulf of Mexico in 2012. A dataset consisting measurements from a 94 GHz radar towards fixed corner reflector was established frame SMARTEX campaign together with characterization. show subset results obtained comparison some modelling examples.
Abstract. Second order moments of multivariate (often Gaussian) joint probability density functions can be described by the covariance or normalised correlation matrices Kennaugh matrix (Kronecker matrix). In Radar Polarimetry application is known as target decomposition theory, which a special extremely versatile Principle Component Analysis (PCA). The basic idea PCA to convert data set, consisting correlated random variables into new set uncorrelated and according value their variances. It...
As the operating frequencies of SAR-systems are increasing, visible distortions due to precipitation in SAR-images becoming more frequent. This holds especially for case convective rain events. The German space-borne satellite TerraSAR-X has delivered a series measurement examples, which were used study effects SARimages. Based on these valuable data takes and simultaneous weather radar measurements, quantitative estimation is presented. In further step, an attempt made extrapolate observed...
Long-range mechanically rotating weather radar systems currently in use suffer from inherent performance limitations including coarse resolution, long update time and beam blockage. More importantly their long-range sensing approach prevents sufficient monitoring of the lower troposphere below a height 1 km. Social significance such lack capability extends up to hinder timely reaction important short term phenomena as tornadoes. Conversely, short-range strategy could address most these...
Maritime environment, and in particular the sea clutter, has a significant impact on detection efficiency. Therefore physical properties of radar clutter must be well mastered. In this paper, we focus data acquired during an experiment called MARLENE, which was held Mediterranean Sea region Toulon, France, 2014. The aim to characterize environment influence propagation backscattering for Refractivity From Clutter (RFC) Doppler detection. Three coastal radars, MARSIG (WTD 71), MEMPHIS (FHR)...
Statistical and computational techniques for revealing the internal structure that underlies set of random correlated data exists in a great variety at present; target decomposition theorems, either coherent or incoherent formulation, are well established. In spite this fact rather innovative new concept is presented contribution. turn Principal Component Analysis (PCA) considered to possibly add value existing approaches, it allows an interpretation polarimetric synthetic aperture radar...
In this contribution the role of atmosphere on space-borne synthetic aperture radar (SAR) systems is revisited in some detail and reviewed together with a first step towards quantitative assessment effects wideband signals phase.