Name
Title | ||
|---|---|---|
Ground Maneuvering Target Focusing via High-Order Phase Correction in High-Squint Synthetic Aperture Radar |
Abstract | ||
|---|---|---|
Moving target imaging in high-squint synthetic aperture radar (SAR) shows great potential for reconnaissance and surveillance tasks. For the desired resolution, high-squint SAR has a long-time coherent processing interval (CPI). In this case, the maneuvering motion of the moving target usually causes high-order phase terms in the echoed data, which cannot be neglected for precise focusing. Many ground moving target imaging (GMTIm) algorithms have been proposed in the literature, but some high-order phase terms remain uncompensated in high-squint SAR. For this problem, a high-order phase correction-based GMTIm (HPC-GMTIm) method is proposed in this paper. We assumed that the target of interest has a constant velocity in the subaperture CPI, but maneuvering motion parameters for the whole CPI. Within the short subaperture CPI, the target signal can be simplified as a three-order phase expression, and the instantaneous Doppler frequency (DF) was estimated by some time-frequency analysis tools, including the Hough transform and the fractional Fourier transform. For the whole CPI, the subaperture, the instantaneous DF was combined to form a total least-squares problem, outputting the undetermined phase coefficients. Using the proposed local-to-global processing chain, all high-order phase terms can be estimated and corrected, which outperforms existing methods. The effectiveness of the HPC-GMTIm method is demonstrated by real measured high-squint SAR data. |
Year | DOI | Venue |
|---|---|---|
2022 | 10.3390/rs14061514 | REMOTE SENSING |
Keywords | DocType | Volume |
ground moving target imaging (GMTIm), high-order phase correction, high-squint SAR, maneuvering motion, parameter estimation | Journal | 14 |
Issue | ISSN | Citations |
6 | 2072-4292 | 0 |
PageRank | References | Authors |
0.34 | 0 | 3 |