Filters








129 Hits in 5.2 sec

SAR Altimetry Applications over Water [article]

C. Martin-Puig, J. Marquez, G. Ruffini, R.K. Raney, J. Benveniste
2008 arXiv   pre-print
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

Ferdinando Reale, Fabio Dentale, Eugenio Carratelli, Luciana Fenoglio-Marc
2018 Remote Sensing  
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

P. Foglia Manzillo, C. N. van Dijk, S. Conticello, M. Esposito, R. Lussana, F. Villa, D. Tamborini, F. Zappa, A. Tosi, A. Roncat, N. Pfeiffer, T. Entner (+3 others)
2015 Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing XI  
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]

P. Hoogeboom, L. Lidicky
2008 Remote Sensing of the European Seas  
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

Emmanuel S. Garcia, David T. Sandwell, Walter H.F. Smith
2014 Geophysical Journal International  
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

G. D. Quartly, M. A. Srokosz, A. C. McMillan
2001 Journal of Atmospheric and Oceanic Technology  
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

Craig J. Donlon, Robert Cullen, Luisella Giulicchi, Pierrik Vuilleumier, C. Richard Francis, Meike Kuschnerus, William Simpson, Abderrazak Bouridah, Mauro Caleno, Roberta Bertoni, Jesus Rancaño, Eric Pourier (+20 others)
2021 Remote Sensing of Environment  
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

T. Börner, M. Galletti, N. P. Marquart, G. Krieger
2010 Natural Hazards and Earth System Sciences  
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

Alejandro Egido, Walter H. F. Smith
2017 IEEE Transactions on Geoscience and Remote Sensing  
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

Patrick Vincent, Nathalie Steunou, Eric Caubetq, Laurent Phalippou, Laurent Rey, Eric Thouvenot, Jacques Verron
2006 Sensors  
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

Liguang Jiang, Raphael Schneider, Ole Andersen, Peter Bauer-Gottwein
2017 Water  
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

Peng Zhou, Weiqiang Lv, Zhenhua Zhang, Ying Wang, Xi Zhang, Yongshou Dai
2020 IEEE Access  
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

Marco Mastrogiuseppe
2019 Remote Sensing  
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

G. D. Quartly, M. Passaro
2014 Marine Geodesy  
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  
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