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 languageEnglish
    Title of host publicationProceedings of the IEEE 2001 International Geoscience and Remote Sensing Symposium
    Volume5
    Publication date2001
    Pages2028-2030
    ISBN (Print)0-7803-7031-7
    DOIs
    Publication statusPublished - 2001
    EventIEEE 2001 International Geoscience and Remote Sensing Symposium - Sydney, Australia
    Duration: 9 Jul 200113 Jul 2001
    http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=7695

    Conference

    ConferenceIEEE 2001 International Geoscience and Remote Sensing Symposium
    CountryAustralia
    CitySydney
    Period09/07/200113/07/2001
    Internet address

    Bibliographical note

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