Effects of Ocean Wind, Foam/Spray and Atmosphere on Four Stokes Parameters in Passive Polarimetric Remote Sensing of the Ocean Based on Numerical Simulations and Analytic Theory

2003 ◽  
Author(s):  
Leung Tsang
Keyword(s):  
Remote Sensing ◽  
Numerical Simulations ◽  
Analytic Theory ◽  
Stokes Parameters ◽  
Ocean Wind

An Assessment of CYGNSS Ocean Wind Speed Products

2021 ◽  
Author(s):  
Matthew Hammond ◽  
Giuseppe Foti ◽  
Christine Gommenginger ◽  
Meric Srokosz ◽  
Nicolas Floury
Keyword(s):  
Remote Sensing ◽  
Wind Speed ◽  
Satellite System ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
The Earth ◽  
L1 Data ◽  
Global Navigation ◽  
Global Navigation Satellite ◽  
Ocean Wind

<p>Global Navigation Satellite System-Reflectometry (GNSS-R) is an innovative and rapidly developing approach to Earth Observation that makes use of signals of opportunity from Global Navigation Satellite Systems, which have been reflected off the Earth’s surface. CYGNSS is a constellation of 8 satellites launched in 2016 which use GNSS-R technology for the remote sensing of ocean wind speed. The ESA ECOLOGY project aims to evaluate CYGNSS data which has recently undergone a series of improvements in the calibration approach. Using CYGNSS collections above the ocean surface, an assessment of Level-1 calibration is presented, alongside a performance evaluation of Level-2 wind speed products. L1 data collected by the individual satellites are shown to be generally well inter-calibrated and remarkably stable over time, a significant improvement over previous versions. However, some geographical biases are found, which appear to be linked to a number of factors including the transmitter-receiver pair considered, viewing geometry, and surface elevation. These findings provide a basis for further improvement of CYGNSS products and have wider applicability to improving calibration of GNSS-R sensors for remote sensing of the Earth.</p>

scholarly journals An Overview of Computational MHD Jets and Their Comparisons with Recent High Resolution Radio Images

1990 ◽  
Vol 140 ◽  
pp. 403-412
Author(s):  
David A. Clarke
Keyword(s):  
High Resolution ◽  
Numerical Simulations ◽  
Stokes Parameters ◽  
Synchrotron Emission ◽  
Significant Progress ◽  
Astrophysical Jets ◽  
Axisymmetric Jet ◽  
Radio Jets ◽  
Made In

Significant progress has been made in comparing numerical simulations with radio images of astrophysical jets. One is no longer forced to compare density slices through an axisymmetric jet simulation with observed Stokes I images. With the advent of MHD codes and modern supercomputers, models can now be constrained by all four Stokes parameters. In this paper, recent efforts to simulate synchrotron emission images of extragalactic radio jets are reviewed.

scholarly journals Numerical Simulations of a 2.05 μm Q-switched Ho:YLF Laser for CO2IPDA Space Remote Sensing

2016 ◽  
Vol 119 ◽  
pp. 05003
Author(s):  
Jessica Barrientos Pellegrino ◽  
Dimitri Edouart ◽  
Fabien Gibert ◽  
Claire Cenac
Keyword(s):  
Remote Sensing ◽  
Numerical Simulations

scholarly journals Remote Sensing of Cirrus Cloud Particle Size and Optical Depth Using Polarimetric Sensor Measurements

2005 ◽  
Vol 62 (12) ◽  
pp. 4371-4383 ◽  
Author(s):  
S. C. Ou ◽  
K. N. Liou ◽  
Y. Takano ◽  
R. L. Slonaker
Keyword(s):  
Remote Sensing ◽  
Particle Size ◽  
Optical Depth ◽  
Steepest Descent Method ◽  
Stokes Parameters ◽  
Retrieval Algorithm ◽  
Cirrus Cloud ◽  
Transfer Program ◽  
Ice Crystal ◽  
Cloud Particle

Abstract This paper presents a conceptual approach toward the remote sensing of cirrus cloud particle size and optical depth using the degree of polarization and polarized reflectance associated with the first three Stokes parameters, I, Q, and U, for the 0.865- and 2.25-μm wavelengths. A vector line-by-line equivalent radiative transfer program including the full Stokes parameters based on the adding method was developed. The retrieval algorithm employs the steepest-descent method in the form of a series of numerical iteration procedures to search for the simulated polarization parameters that best match the measured values. Sensitivity studies were performed to investigate the behavior of phase-matrix elements as functions of scattering angles for three ice crystal size–shape combinations. Overall, each phase-matrix element shows some sensitivity toward ice crystal shape, size, and surface roughness due to the various optical effects. Synthetic analysis reveals that the retrieval algorithm is highly accurate, while polarimetric and radiometric error sources cause very small retrieval errors. Finally, an illustrative example of applying the retrieval algorithm to airborne Polarization and Directionality of the Earth’s Reflectances (POLDER) data during the European Cloud and Radiation Experiment (EUCREX) is presented.

scholarly journals Wave-like warp propagation in circumbinary discs – I. Analytic theory and numerical simulations

2013 ◽  
Vol 433 (3) ◽  
pp. 2142-2156 ◽  
Author(s):  
Stefano Facchini ◽  
Giuseppe Lodato ◽  
Daniel J. Price
Keyword(s):  
Numerical Simulations ◽  
Analytic Theory
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