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PIER PIER B PIER C PIER M PIER Letters
2012-01-06
A Novel Estimation Approach of Dynamic and Coupling Baseline for Distributed Satellite SAR
By
Liang Feng,

    Dr. Liang Feng

    School of Electronic and Information Engineering

    Beihang University

    China

    Homepage

Huaping Xu,

    Dr. Huaping Xu

    School of Electronic and Information Engineering

    Beihang University

    China

    Homepage

Chun-Sheng Li,

    Dr. Chun-Sheng Li

    School of Electronics and Information Engineering

    Beijing University of Aeronautics and Astronautics

    China

    Homepage

Shuang Li,

    Dr. Shuang Li

    School of Electronic and Information Engineering

    Beihang University

    China

    Homepage

Han Gao

    Dr. Han Gao

    School of Electronic and Information Engineering

    Beihang University

    China

    Homepage

Progress In Electromagnetics Research, Vol. 123, 467-484, 2012
doi:10.2528/PIER11083105
Abstract
In distributed satellite synthetic aperture radar (DS-SAR), along-track and cross-track baselines couple with each other and change dynamically due to formation flying, which makes it difficult to estimate interferometric baseline accurately. To solve the problem, a novel high-precision baseline estimation approach based on interferometric phase is proposed. By modeling accurate relationship between coupling baselines and two-dimensional (azimuth and range) inteferometric fringe frequency under the ellipsoid earth model, the along-track and cross-track baseline can be estimated separately by interferometric phase decoupling. By selecting several segments from interferometric phase during the whole data-take time and estimating instantaneous baseline of each segment, the dynamic baseline can be obtained via a linear filtering. Besides, to improve the baseline estimation accuracy, Semi-Newton iterative method is applied to acquire high-precision fringe frequency estimation, which can make the baseline estimation achieve centimeter level precision. The simulation validates the approach.
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Citation
Liang Feng, Huaping Xu, Chun-Sheng Li, Shuang Li, and Han Gao, "A Novel Estimation Approach of Dynamic and Coupling Baseline for Distributed Satellite SAR," Progress In Electromagnetics Research, Vol. 123, 467-484, 2012.
doi:10.2528/PIER11083105
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