A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2019; you can also visit the original URL.
The file type is application/pdf.
Filters
SAR Altimetry Applications over Water
[article]
2008
arXiv
pre-print
Preserved Fulltext
Frequency (PRF) reduced SAR mode data and low PRF classical Low-Resolution Mode (LRM) data. ...
More specifically, one of the tasks focuses on the reduction of SAR mode data to pulse-limited altimeter data, and a theoretical modelling to characterize the expected gain between high Pulse Repetition ...
ACKNOWLEDGEMENTS The authors would like to acknowledge the SAMOSA team (ESRIN Contract No. 20698/07/I-LG) the CRYMPS team (MSSL), and Maria Milagro (Serco support to ESA-ESRIN) ...
arXiv:0802.0804v1
fatcat:yfidfbeumzeavjsfug47q7u53e
Influence of Sea State on Sea Surface Height Oscillation from Doppler Altimeter Measurements in the North Sea
2018
Remote Sensing
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2019; you can also visit the original URL.
The file type is application/pdf.
CryoSat-2 altimeter sea surface height (SSH) data in the North Sea, processed in both DDA and pseudo low resolution mode (PLRM), are correlated with European Centre for Medium-Range Weather Forecasts ( ...
To provide an explanation of these results, the aliasing effect caused by the interaction between the sea wavelength and the altimeter resolution has been considered; a simple model has, therefore, been ...
The successive pulses within the bursts are correlated because the PRF is high (18 kHz). ...
doi:10.3390/rs10071100
fatcat:53shphjxtjemvl5bf5sprp35qa
ALART: a novel lidar system for vegetation height retrieval from space
2015
Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing XI
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
We propose a multi-kHz Single-Photon Counting (SPC) space LIDAR, exploiting low energy pulses with high repetition frequency (PRF). ...
The high PRF allows one to overcome the low signal limitations, as many return shots can be collected from nearly the same scattering area. ...
Moreover, the use of high Pulse Repetition Frequency (PRF) is the key to overcome the low signal intensity limitations, as many return shots can be collected from nearly the same scattering area, while ...
doi:10.1117/12.2196134
fatcat:i6mgjohdvfhitbbxvgucpo2v6i
Introduction to Microwave Active Techniques and Backscatter Properties
[chapter]
2008
Remote Sensing of the European Seas
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2019; you can also visit the original URL.
The file type is application/pdf.
The addition of resolving power in a second dimension perpendicular to radar ranging leads to imaging devices that exist in many varieties. ...
In section 1 the ranging principle and associated topics are introduced. As an example of this technique the radar altimeter is described. ...
Pulse Compression and Range Resolution To obtain high range resolution in radar, pulses with a wide spectrum must be transmitted. ...
doi:10.1007/978-1-4020-6772-3_19
fatcat:tnrlhegvjrcftfib7tdq7fstmy
Retracking CryoSat-2, Envisat and Jason-1 radar altimetry waveforms for improved gravity field recovery
2014
Geophysical Journal International
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2014; you can also visit the original URL.
The file type is application/pdf.
The range precision of these data is significantly improved with respect to the conventional techniques used in operational oceanography by retracking the altimeter waveforms using an algorithm that is ...
In addition, CryoSat-2 has a new synthetic aperture radar (SAR) mode that should result in higher range precision. ...
When CryoSat-2 operates in its SAR mode, the PRF is high enough to allow Doppler beam sharpening. ...
doi:10.1093/gji/ggt469
fatcat:4rlk62vynvavtm7xgzwhbeoplq
Analyzing Altimeter Artifacts: Statistical Properties of Ocean Waveforms
2001
Journal of Atmospheric and Oceanic Technology
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
This is the first paper to analyze waveform data from a number of altimeters in a consistent manner. ...
of the instrument to be such as to avoid spurious anomalies in the waveforms. ...
For bins in the trailing edge, the ratio between the ''before'' and ''after'' waveforms is 1.244, that is, an effective incre- ...
doi:10.1175/1520-0426(2001)018<2074:aaaspo>2.0.co;2
fatcat:gz63yfet7bainl7z4afsjjfsui
The Copernicus Sentinel-6 mission: Enhanced continuity of satellite sea level measurements from space
2021
Remote Sensing of Environment
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2021; you can also visit the original URL.
The file type is application/pdf.
and reduced measurement noise; the second provides a Low Resolution Mode that is fully backward-compatible with the historical reference altimetry measurements, allowing a complete inter-calibration between ...
The main payload is the Poseidon-4 dual frequency (C/Ku-band) nadir-pointing radar altimeter that uses an innovative interleaved mode. ...
The research described in this paper was carried out, in part, at the European Space Agency, and others (identified in the paper), under contracts with ESA. ...
doi:10.1016/j.rse.2021.112395
fatcat:de4tps7yevf3lgmktqtmvusezu
Concept study of radar sensors for near-field tsunami early warning
2010
Natural Hazards and Earth System Sciences
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
In this paper we propose new concepts for near-field tsunami early detection, based on innovative and up-to-date microwave remote sensing techniques. ...
Off-shore detection of tsunami waves is a critical component of an effective tsunami early warning system (TEWS). ...
With a linear movement of the platform along the antenna aperture (azimuth) a much larger antenna aperture can be synthesized, resulting in the typical high-resolution SAR imaging mode, which is used by ...
doi:10.5194/nhess-10-1957-2010
fatcat:a2nkf6bqpbguxp3nghzgubt7r4
Fully Focused SAR Altimetry: Theory and Applications
2017
IEEE Transactions on Geoscience and Remote Sensing
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
In this paper, we introduce the concept, develop the theory, and demonstrate the advantages of fully focused coherent processing of pulse echoes from a nadir-looking pulse-limited radar altimeter. ...
In addition, over rough homogeneous surfaces, such as the ocean or ice sheets, the improved multilooking capability of FF-SAR leads to a significant increase in the effective number of looks with respect ...
ACKNOWLEDGMENT The authors would like to thank R. K. Raney and their NOAA Laboratory for Satellite Altimetry colleagues for helpful discussions. ...
doi:10.1109/tgrs.2016.2607122
fatcat:3qtgprx4hvfqtife6un6v7d47u
AltiKa: a Ka-band Altimetry Payload and System for Operational Altimetry during the GMES Period
2006
Sensors
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
To answer the corresponding requirements, the approach consisting in a constellation of nadir altimeter is discussed. ...
A short review of some mission objectives to be fulfilled in terms of mesoscale oceanography in the frame of the GEOSS and GMES programs is performed. ...
Acknowledgments The work presented in this paper involved a large number of scientists who have been contributing through the AltiKa Mission Group: The authors would like to thank all these scientists ...
doi:10.3390/s6030208
fatcat:rpylptytsjf73eipczyxo37b5q
CryoSat-2 Altimetry Applications over Rivers and Lakes
2017
Water
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2019; you can also visit the original URL.
The file type is application/pdf.
Except CryoSat-2, all radar altimetry missions have been operated in conventional low resolution mode with a short repeat orbit (35 days or less). ...
The narrow inter-track distance (7.5 km at the equator) makes it possible to monitor many lakes and rivers and SAR mode provides a finer along-track resolution, higher return power and speckle reduction ...
Author Contributions: All authors contributed extensively to this paper.
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/w9030211
fatcat:h5obljaonfb75new25kiq6ivsi
System Parameter Design of Multimodal Small Satellite SARs Operating in Scan Mode and Transmit Power Optimization for Marine Scenes
2020
IEEE Access
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
ACKNOWLEDGMENT The authors would like to thank the anonymous reviewers for their valuable comments and suggestions, which helped to substantially improve the quality of this paper. ...
In [15] the design process of system parameters in strip mode was introduced, and [16] discusses the design of key system parameters for a high-resolution wide geosynchronous orbit (GEO)/low earth orbit ...
When applied to marine scenes, SAR mode has obvious advantages in detecting marine targets [6] ; altimeter mode measures sea surface height with high precision; scatterometer mode is good at retrieving ...
doi:10.1109/access.2020.2975907
fatcat:d4qojxv5lfftzpddita3cnmghu
Dual Frequency Orbiter-Radar System for the Observation of Seas and Tides on Titan: Extraterrestrial Oceanography from Satellite
2019
Remote Sensing
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
The proposed system, which could take advantage of the telecommunications dish, can operate as a sounder, as Synthetic Aperture Radar (SAR) able to map the surface at tens meters of scale resolution, and ...
The instrument, which is based on the architecture of the Cassini RADAR, can also characterize Titan's interior by using geophysical measurements of the tidal amplitude to derive high accuracy estimates ...
The author would also thanks Marica Raguso, Valerio Poggiali and Alex Hayes, whose comments helped to improve the quality of this work. ...
doi:10.3390/rs11161898
fatcat:n35kwhwllvgmdgkvkucgyyoiem
Initial Examination of AltiKa's Individual Echoes
2014
Marine Geodesy
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
The AltiKa altimeter records the reflection of K a -band radar pulses from the Earth's surface, with the commonly used waveform product involving the summation of 96 returns to provide average echoes at ...
Early exploration of the complex echoes reveals structure in the phase information similar to that noted for Envisat's IEs. ...
The authors are grateful to Amandine Guillot & Nicolas Picot for the provision of the High Density (HD) data, to Jean-Damien Desjonquères for useful discussions at the SARAL/AltiKa Meet, and to Helen Snaith ...
doi:10.1080/01490419.2014.984882
fatcat:y2evjmk3qrbdtbna2bk53i3ooa
Spacebased Radar Sensors
[chapter]
2006
Spacecraft Sensors
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
Signal processing could include Fourier transforms or correlation. The low pass filter (LPF) is used to remove the upper side band from mixing. ...
High-resolution is made possible because of its peak power capability, the pulse compression techniques used and pulse coherence. ...
doi:10.1002/0470865296.ch6
fatcat:ivjd6tpmg5dppes2lpvesa2zk4
« Previous
Showing results 1 — 15 out of 129 results