ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERS

The scatterometer on-board ERS-2, earth-observation satellite developed by the European Space Agency, is an active real aperture radar instrument designed to measure the backscatter coefficient 0 from the earth. Its main utility is to measure physical parameters such as wind speeds and directions ov...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Manise,Nicolas, Neyt,Xavier, Acheroy,Marc
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2004
Materias:	Scatterometer calibration transponder
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300011
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0717-65382004000300011
record_format	dspace
spelling	oai:scielo:S0717-653820040003000112005-05-16ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERSManise,NicolasNeyt,XavierAcheroy,Marc Scatterometer calibration transponder The scatterometer on-board ERS-2, earth-observation satellite developed by the European Space Agency, is an active real aperture radar instrument designed to measure the backscatter coefficient 0 from the earth. Its main utility is to measure physical parameters such as wind speeds and directions over the sea surface. Due to malfunctions of the on-board gyroscopes and even though a new attitude and orbit control system is used, the yaw-orientation of the spacecraft still exhibits random variations from the nominal attitude. This unpredictable attitude requires re-developing the calibration chain of the scatterometer instrument. Distributed targets, such as the rain forest, are used to perform a relative calibration while transponders situated at known locations in Spain permit an absolute calibration of the instrument. The scope is to expose the obtained results and the improvements brought by the new chain regarding the absolute calibration. An analysis of the received echo with a sub-pixel resolution (better than the nominal resolution) allows getting accurate transponder localization. The localization error is used to determine, among other quantities, the antenna mounting angles errors. Since the signal emitted by the transponders is calibrated, radiometric calibration is also possible, including determination of a large set of parameters such as the absolute gain of each antenna. The raw data quality (such as DC offsets, gain imbalance, phase imbalance) and the spatial resolution are also computedinfo:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana (Concepción) v.68 n.2 suppl.TIIProc 20042004-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300011en10.4067/S0717-65382004000300011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Scatterometer calibration transponder
spellingShingle	Scatterometer calibration transponder Manise,Nicolas Neyt,Xavier Acheroy,Marc ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERS
description	The scatterometer on-board ERS-2, earth-observation satellite developed by the European Space Agency, is an active real aperture radar instrument designed to measure the backscatter coefficient 0 from the earth. Its main utility is to measure physical parameters such as wind speeds and directions over the sea surface. Due to malfunctions of the on-board gyroscopes and even though a new attitude and orbit control system is used, the yaw-orientation of the spacecraft still exhibits random variations from the nominal attitude. This unpredictable attitude requires re-developing the calibration chain of the scatterometer instrument. Distributed targets, such as the rain forest, are used to perform a relative calibration while transponders situated at known locations in Spain permit an absolute calibration of the instrument. The scope is to expose the obtained results and the improvements brought by the new chain regarding the absolute calibration. An analysis of the received echo with a sub-pixel resolution (better than the nominal resolution) allows getting accurate transponder localization. The localization error is used to determine, among other quantities, the antenna mounting angles errors. Since the signal emitted by the transponders is calibrated, radiometric calibration is also possible, including determination of a large set of parameters such as the absolute gain of each antenna. The raw data quality (such as DC offsets, gain imbalance, phase imbalance) and the spatial resolution are also computed
author	Manise,Nicolas Neyt,Xavier Acheroy,Marc
author_facet	Manise,Nicolas Neyt,Xavier Acheroy,Marc
author_sort	Manise,Nicolas
title	ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERS
title_short	ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERS
title_full	ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERS
title_fullStr	ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERS
title_full_unstemmed	ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERS
title_sort	absolute calibration of the ers-2 scatterometer in gyro-less mode using transponders
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300011
work_keys_str_mv	AT manisenicolas absolutecalibrationoftheers2scatterometeringyrolessmodeusingtransponders AT neytxavier absolutecalibrationoftheers2scatterometeringyrolessmodeusingtransponders AT acheroymarc absolutecalibrationoftheers2scatterometeringyrolessmodeusingtransponders
_version_	1718442074738524160

ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERS

Ejemplares similares