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PIER PIER B PIER C PIER M PIER Letters
2013-10-21
A Refined Two-Dimensional Nonlinear Chirp Scaling Algorithm for Geosynchronous Earth Orbit SAR
By
Tao Zeng,

    Dr. Tao Zeng

    Department of Electronic Engineering

    Beijing Institute of Technology

    China

    Homepage

Wenfu Yang,

    Dr. Wenfu Yang

    Department of Electronic Engineering

    Beijing Institute of Technology

    China

    Homepage

Zegang Ding,

    Professor Zegang Ding

    School of Information and Electronics

    Beijing Institute of Technology

    China

    Homepage

Dacheng Liu,

    Dr. Dacheng Liu

    Department of Electronic Engineering

    Beijing Institute of Technology

    China

    Homepage

Teng Long

    Dr. Teng Long

    Department of Electronic Engineering

    Beijing Institute of Technology

    China

    Homepage

Progress In Electromagnetics Research, Vol. 143, 19-46, 2013
doi:10.2528/PIER13071206
Abstract
Taking into account long signal propagation time, curved orbit and ``near-far-near'' slant range histories at apogee, a refined slant range model (RSRM) is presented for geosynchronous earth orbit synthetic aperture radar (GEO SAR) in this paper. Additional linear component and high order components are introduced into straight orbit assumption (SOA) model to describe relative motion during long signal propagation and curved orbit respectively. And the special slant range histories at apogee are considered through adding terms changing with the sign of Doppler rate. Then, based on RSRM under an ideal acquisition and ignoring nonideal factors (such as depolarization and attenuation effects), a refined two-dimensional nonlinear chirp scaling algorithm (RTNCSA) is proposed. Space-variant range cell migration (RCM) caused by range-variant effective velocities is corrected by refined range nonlinear chirp scaling algorithm, and the variable Doppler parameters in azimuth direction are equalized through refined azimuth nonlinear chirp scaling algorithm. Finally, RSRM is verified by 600-second direct signal received by a stationary receiver on a tall building from BeiDou navigation satellite, and RTNCSA is validated through simulated point array targets with resolution of 5 m and scene size of 150 km.
Citation
Tao Zeng, Wenfu Yang, Zegang Ding, Dacheng Liu, and Teng Long, "A Refined Two-Dimensional Nonlinear Chirp Scaling Algorithm for Geosynchronous Earth Orbit SAR," Progress In Electromagnetics Research, Vol. 143, 19-46, 2013.
doi:10.2528/PIER13071206
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