Results 221 to 230 of about 14,002 (250)
Some of the next articles are maybe not open access.
Near‐nadir radar backscatter from a well‐developed sea
Radio Science, 1990Recent advances in understanding dynamics and statistical geometry of wind‐generated gravity waves necessitate a re‐examination of the radar return as a function of external factors. The Kirchhoff approximation for the case of well‐developed seas is analyzed.
openaire +1 more source
Consideration of vertical resolution for near nadir-looking spaceborne radar
IEEE Transactions on Geoscience and Remote Sensing, 1989A definition of the effective vertical resolution for a down-looking rain radar is proposed on the basis of a general consideration of radar resolution in which the radar resolution for an arbitrary direction is determined by an average radar response function.
openaire +1 more source
Scattering from a fractal surface: acoustical experiments and comparison with near-nadir models
Icarus, 2004A homogeneous resin print of the surface of a naturally-fractured granite block with an experimental Hurst exponent H 0.7 is placed in a water tank. An acoustical source insonifies the surface in a near-nadir direction and the backscattered waves are recorded near the source. Such measurements are made at different positions along a profile above the
Stéphanie Gautier, Dominique Gibert
openaire +1 more source
Radar Scattering from a Self-Affine Fractal Surface: Near-Nadir Regime
Icarus, 1999Abstract Planetary surfaces are better described by nonstationary fractal statistics than those more commonly assumed in current radar scattering models. Therefore, we have developed a radar scattering model applicable to self-affine fractal surfaces when observed near-nadir.
Shepard, M. K., Campbell, Bruce A.
openaire +1 more source
Inland Water Height Estimation Without Ground Control Points for Near-Nadir InSAR Data
IEEE Geoscience and Remote Sensing Letters, 2016Surface Water and Ocean Topography (SWOT) is a future wide-swath radar altimetry mission. The main instrument is the Ka-band radar interferometer (KaRIn). It provides interferometric radar images that will be processed to obtain water elevation estimates worldwide.
Damien Desroches +5 more
openaire +1 more source
On the estimation of wind vectors over the sea surface from near-nadir radar observations
2013 US National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM), 2013The remote sensing of wind vectors over the sea surface using microwave scatterometry has a long history. Traditional scatterometer systems operate at moderate incidence angles in order to emphasize the Bragg scatter component of the sea surface normalized radar cross section (NRCS), and typically require multiple azimuth “looks” in order to reduce ...
Jeffrey D. Ouellette +3 more
openaire +1 more source
Error Analysis of Dynamic Sea Surface Height Measurement by Near-nadir Interferometric SAR
2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR), 2019High precision measurement of sea surface is great significance for the remote sensing of spaceborne ocean. The near-nadir spaceborne interferometric synthetic aperture radar (InSAR) can be used to measure Sea Surface Height (SSH) with centimeter-level accuracy in wide area.
Donghua Zhang +5 more
openaire +1 more source
Journal of Geophysical Research: Planets, 2003
We examine the relative importance of coherent and incoherent echo components in near‐nadir radar scattering from self‐affine surfaces. The coherent component, important only for observations at small incidence angles (nadir‐looking sounders and altimeters), is a function of both surface roughness and scattering area.
Campbell, Bruce A., Shepard, Michael K.
openaire +1 more source
We examine the relative importance of coherent and incoherent echo components in near‐nadir radar scattering from self‐affine surfaces. The coherent component, important only for observations at small incidence angles (nadir‐looking sounders and altimeters), is a function of both surface roughness and scattering area.
Campbell, Bruce A., Shepard, Michael K.
openaire +1 more source
Observation of high-resolution fetch-limited wave growth using CFOSAT near-nadir measurements
2020<p>CFOSAT is the joint space mission of the French (CNES) and Chinese (CNSA) space agencies dedicated to the observation of ocean surface wind and waves. Two main on-board payloads, the Ku-band near-nadir wave scatterometer SWIM and dual-polarization Ku-band wind scatterometer SCAT for the first time provide regular synchronized ...
Alexey Mironov, Bertrand Chapron
openaire +1 more source
Radio Science, 1995
Rain profile retrieval from spaceborne radar is difficult because of the presence of attenuation at the higher frequencies planned for these systems. One way to reduce the ambiguity in the retrieved rainfall profile is to use the path‐integrated attenuation as a constraint. Two techniques for measuring the path‐integrated attenuation have been proposed:
S. L. Durden +6 more
openaire +1 more source
Rain profile retrieval from spaceborne radar is difficult because of the presence of attenuation at the higher frequencies planned for these systems. One way to reduce the ambiguity in the retrieved rainfall profile is to use the path‐integrated attenuation as a constraint. Two techniques for measuring the path‐integrated attenuation have been proposed:
S. L. Durden +6 more
openaire +1 more source