Abstract
This paper presents a three-dimensional (3D) range migration algorithm (RMA) suitable for downward-looking 3D-SAR with single-transmitting and multiple-receiving linear array antennas (STMR-LAA). As the round-trip range equation in 3D-SAR with STMR-LAA is a dual square root, the signal spectrum in 3D wavenumber domain contains nonlinear phase terms besides constant and linear phase terms. In this paper, the approximate expression of the signal spectrum is derived by expanding the implicit phase term to its Taylor series. Then the constant and nonlinear phase terms are calculated and compensated by multiplying the wavenumber filters. Finally, a 3D wavenumber mapping is proposed to make the signal evenly sampled in 3D wavenumber domain. Some simulating results are presented to validate the correctness of the analysis and the feasibility of the algorithm. In addition, the required accuracy on the platform position is analyzed at the end of the paper.
Highlights
Synthetic aperture radar (SAR) is a well-developed technique for remote sensing
This paper presents a three-dimensional (3D) range migration algorithm (RMA) suitable for downward-looking 3D-SAR with single-transmitting and multiple-receiving linear array antennas (STMR-LAA)
We propose a 3D RMA which can be applied to downward-looking 3D-SAR with singletransmitting and multiple-receiving linear array antennas (STMR-LAA)
Summary
Synthetic aperture radar (SAR) is a well-developed technique for remote sensing. It can provide two-dimensional (2D) high-resolution radar images along azimuth and slant-range directions. Klare et al [8, 9] introduced the concept of virtual antenna elements formed by the mean positions of every single transmitting and receiving antenna element to transform bistatic configuration into monostatic configuration and proposed a 3D imaging algorithm for ARTINO with beamforming operation in cross-track direction. Tan et al [20] proposed a 3D RMA for SAR tomography imaging with digital spotlight in the elevation direction All of these 3D RMAs are suitable for the monostatic configuration, where the signal spectrum in 3D wavenumber domain only contains constant and linear phase terms. We propose a 3D RMA which can be applied to downward-looking 3D-SAR with singletransmitting and multiple-receiving linear array antennas (STMR-LAA).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
