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Bistatic SAR Polar Format Image Formation: Distortion Correction and Scene Size Limits

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2017, Master of Science in Electrical Engineering (MSEE), Wright State University, Electrical Engineering.
The polar format algorithm (PFA) for bistatic synthetic aperture radar (SAR) image formation offers the compromise between image quality and computational complexity afforded by PFA, while enabling the geometric flexibility of a bistatic collection scenario. The use of the far-field approximation (FFA), which enables the use of the two-dimensional (2D) fast Fourier transform (FFT) in PFA, introduces spatially-varying distortion and defocus effects causing geometric warping and blurring in the resulting image. In this thesis, the residual phase errors due to the FFA are analyzed by decomposing the residual phase errors in the time dimension into their constant, linear, and quadratic Taylor series components. Based on the analysis, a 2D interpolation-based distortion correction technique is developed, and accurate scene size limits are derived for the corrected image to mitigate the effects of defocus. The phase error analysis is conducted with respect to arbitrary transmitter and receiver trajectories, and examples are demonstrated for both the ideal linear and ideal circular flight geometries using a point target scene simulation.
Brian Rigling, Ph.D. (Advisor)
Michael Saville, Ph.D. (Committee Member)
Joshua Ash, Ph.D. (Committee Member)
61 p.

Recommended Citations

Citations

  • Mao, D. (2017). Bistatic SAR Polar Format Image Formation: Distortion Correction and Scene Size Limits [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1496686554682524

    APA Style (7th edition)

  • Mao, Davin. Bistatic SAR Polar Format Image Formation: Distortion Correction and Scene Size Limits. 2017. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1496686554682524.

    MLA Style (8th edition)

  • Mao, Davin. "Bistatic SAR Polar Format Image Formation: Distortion Correction and Scene Size Limits." Master's thesis, Wright State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1496686554682524

    Chicago Manual of Style (17th edition)