2 GHz self-aligning tandem A/D converter for SAR

Sten Schmidl Søbjærg; Erik Lintz Christensen

doi:10.1109/IGARSS.2001.977892

2 GHz self-aligning tandem A/D converter for SAR

Sten Schmidl Søbjærg, Erik Lintz Christensen

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Abstract

A new generation of the Danish synthetic aperture radar system (EMISAR) is under development targeting a bandwidth of 800 MHz and a corresponding range resolution of around 25 cm. Two alternative approaches to achieve the wide bandwidth are considered. One is to use analog I/Q demodulation before digitizing, and the other is to digitize the signal before digital I/Q demodulation. In both cases the digitizing may be performed by a digital front end (DFE) with two parallel analog-to-digital-converters (ADCs) sampling at 1 GHz in phase or in anti-phase respectively, provided the analog bandwidth of the ADC is sufficient. In the first case each ADC has to digitize a 0-400 MHz signal, and in the second case both ADCs have to digitize a 100-900 MHz signal. In both cases the sampling time alignment is a critical parameter. The paper addresses some aspects of ADC alignment in the implementation of a DFE for the EMISAR system.

Original language	English
Title of host publication	Proceedings of the IEEE 2001 International Geoscience and Remote Sensing Symposium
Volume	5
Publication date	2001
Pages	2028-2030
ISBN (Print)	0-7803-7031-7
DOIs	https://doi.org/10.1109/IGARSS.2001.977892
Publication status	Published - 2001
Event	2001 Geoscience and Remote Sensing Symposium - Sydney, Australia Duration: 9 Jul 2001 → 13 Jul 2001 http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=7695

Conference

Conference	2001 Geoscience and Remote Sensing Symposium
Country/Territory	Australia
City	Sydney
Period	09/07/2001 → 13/07/2001
Internet address	http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=7695

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Copyright: 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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title = "2 GHz self-aligning tandem A/D converter for SAR",

abstract = "A new generation of the Danish synthetic aperture radar system (EMISAR) is under development targeting a bandwidth of 800 MHz and a corresponding range resolution of around 25 cm. Two alternative approaches to achieve the wide bandwidth are considered. One is to use analog I/Q demodulation before digitizing, and the other is to digitize the signal before digital I/Q demodulation. In both cases the digitizing may be performed by a digital front end (DFE) with two parallel analog-to-digital-converters (ADCs) sampling at 1 GHz in phase or in anti-phase respectively, provided the analog bandwidth of the ADC is sufficient. In the first case each ADC has to digitize a 0-400 MHz signal, and in the second case both ADCs have to digitize a 100-900 MHz signal. In both cases the sampling time alignment is a critical parameter. The paper addresses some aspects of ADC alignment in the implementation of a DFE for the EMISAR system.",

author = "S{\o}bj{\ae}rg, {Sten Schmidl} and Christensen, {Erik Lintz}",

note = "Copyright: 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE; 2001 Geoscience and Remote Sensing Symposium, IGARSS01 ; Conference date: 09-07-2001 Through 13-07-2001",

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N2 - A new generation of the Danish synthetic aperture radar system (EMISAR) is under development targeting a bandwidth of 800 MHz and a corresponding range resolution of around 25 cm. Two alternative approaches to achieve the wide bandwidth are considered. One is to use analog I/Q demodulation before digitizing, and the other is to digitize the signal before digital I/Q demodulation. In both cases the digitizing may be performed by a digital front end (DFE) with two parallel analog-to-digital-converters (ADCs) sampling at 1 GHz in phase or in anti-phase respectively, provided the analog bandwidth of the ADC is sufficient. In the first case each ADC has to digitize a 0-400 MHz signal, and in the second case both ADCs have to digitize a 100-900 MHz signal. In both cases the sampling time alignment is a critical parameter. The paper addresses some aspects of ADC alignment in the implementation of a DFE for the EMISAR system.

AB - A new generation of the Danish synthetic aperture radar system (EMISAR) is under development targeting a bandwidth of 800 MHz and a corresponding range resolution of around 25 cm. Two alternative approaches to achieve the wide bandwidth are considered. One is to use analog I/Q demodulation before digitizing, and the other is to digitize the signal before digital I/Q demodulation. In both cases the digitizing may be performed by a digital front end (DFE) with two parallel analog-to-digital-converters (ADCs) sampling at 1 GHz in phase or in anti-phase respectively, provided the analog bandwidth of the ADC is sufficient. In the first case each ADC has to digitize a 0-400 MHz signal, and in the second case both ADCs have to digitize a 100-900 MHz signal. In both cases the sampling time alignment is a critical parameter. The paper addresses some aspects of ADC alignment in the implementation of a DFE for the EMISAR system.

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DO - 10.1109/IGARSS.2001.977892

M3 - Article in proceedings

SN - 0-7803-7031-7

VL - 5

SP - 2028

EP - 2030

BT - Proceedings of the IEEE 2001 International Geoscience and Remote Sensing Symposium

T2 - 2001 Geoscience and Remote Sensing Symposium

Y2 - 9 July 2001 through 13 July 2001

ER -

2 GHz self-aligning tandem A/D converter for SAR

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