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Impacts of Radar Echoes on Internal Calibration Signals in the TerraSAR-X Instrument

Bräutigam, Benjamin and Hueso González, Jaime and Schwerdt, Marco (2008) Impacts of Radar Echoes on Internal Calibration Signals in the TerraSAR-X Instrument. In: Proceedings of the CEOS SAR Workshop on Calibration and Validation (CEOS SAR CalVal), p. 1. CEOS SAR Workshop on Calibration and Validation (CEOS SAR CalVal), 2008-11-27 - 2008-11-28, Oberpfaffenhofen, Germany.

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Abstract

For calibrating and monitoring the required radiometric stability, the radar instrument of TerraSAR-X features an internal calibration facility coupling into an additional port of the TRMs. Calibration pulses are routed through the front-end to characterise critical elements and parameters of the transmit (TX) and receive (RX) path. Changes in the signal path appear due to thermal effects, degradation, or extreme conditions in space. Especially the front-end TRMs controlling the phased array antenna are of crucial significance for the instrument reliability. There are many indications that the interference of the RX-Calibration signals is caused by an echo from a transmitted TerraSAR-X chirp pulse of the same data take. As consequently implemented in the TerraSAR-X system, different approaches solve these effects of signal interference. In orbit, the commanding sequence can be optimised for avoiding interference. At processing level, averaging techniques minimise the noise effects inside the calibration signals. This paper presents the effects of the radar echoes on the whole internal calibration process and how they can be detected and minimised.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Impacts of Radar Echoes on Internal Calibration Signals in the TerraSAR-X Instrument
Authors:
AuthorsInstitution or Email of Authors
Bräutigam, BenjaminUNSPECIFIED
Hueso González, JaimeUNSPECIFIED
Schwerdt, MarcoUNSPECIFIED
Date:November 2008
Journal or Publication Title:Proceedings of the CEOS SAR Workshop on Calibration and Validation (CEOS SAR CalVal)
Refereed publication:No
In ISI Web of Science:No
Page Range:p. 1
Status:Published
Keywords:TerraSAR-X, Calibration
Event Title:CEOS SAR Workshop on Calibration and Validation (CEOS SAR CalVal)
Event Location:Oberpfaffenhofen, Germany
Event Type:international Conference
Event Dates:2008-11-27 - 2008-11-28
Organizer:DLR
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Projekt TerraSAR-X Kalibration und Projektunterstützung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Benjamin Bräutigam
Deposited On:27 Nov 2008
Last Modified:12 Dec 2013 20:34

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