Image Formation Algorithm for Asymmetric Bistatic SAR Systems With a Fixed Receiver

• Published in: IEEE transactions on geoscience and remote sensing Vol. 50; no. 11; pp. 4684 - 4698
• Main Authors: Zeng, Tao, Liu, Feifeng, Hu, Cheng, Long, Teng
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.2012; Institute of Electrical and Electronics Engineers
• Subjects: Algorithm design and analysis; Applied geophysics; Approximation algorithms; Approximation methods; Bistatic range migration algorithm (RMA); Earth sciences; Earth, ocean, space; Exact sciences and technology; geometric correction; Internal geophysics; Linearity; nonlinear phase; phase linearity approximation; Receivers; space-surface bistatic synthetic aperture radar (SS-BiSAR); Synthetic aperture radar; algorithms; phase linearity approximation; simulation; space-surface bistatic synthetic aperture radar (SS-BiSAR); focus; trajectory; Bistatic range migration algorithm (RMA); frequency; geometric correction; corrections; nonlinear phase; migration; Synthetic aperture radar
• ISSN: 0196-2892; 1558-0644
• DOI: 10.1109/TGRS.2012.2190937

This paper proposes a highly accurate bistatic range migration algorithm (RMA) for space-surface bistatic synthetic aperture radar (BiSAR) systems with asymmetric configurations when the transmitter moves along a rectilinear trajectory and the receiver stays at a fixed location. The main work here includes three aspects. First, by introducing a 2-D change of frequency variables, an analytical 2-D spectrum formula without any approximation was derived at the first time. Second, with the linearity approximation of the derived phase, a highly accurate bistatic RMA was proposed and guaranteed that the algorithm could be applied to focus the echo from a large target scene. Furthermore, the nonlinear phase of the linearity approximation was analyzed to avoid the defocus effect in the final BiSAR image. Both simulation and indoor experimental results are presented to validate our analysis.