Fast Factorized Backprojection Algorithm in Orthogonal Elliptical Coordinate System for Ocean Scenes Imaging Using Geosynchronous Spaceborne–Airborne VHF UWB Bistatic SAR
Abstract
:1. Introduction
2. Imaging Geometry and Signal Model
3. Bistatic FFBP Algorithm in OEP Coordinate System
3.1. Subaperture Imaging
3.2. Sample Requirements
3.3. Superiority of Subimages in OEP Coordinate System
3.4. Implementation Process
3.5. Computational Burden
4. Experimental Results and Performance Analysis
4.1. Experimental Results of Point Targets
4.2. Experimental Results of Natural Scene
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Subaperture Length | Bistatic EP FFBP (Sampling Point) | Proposed Bistatic FFBP (Sampling Point) | Upgrade Factor |
---|---|---|---|
256 | 25 | 20 | 20% |
512 | 61 | 46 | 25% |
1024 | 96 | 80 | 17% |
Parameters | Values | Parameters | Values | |
---|---|---|---|---|
BiSAR System | Center frequency | 350 MHz | Signal bandwidth | 200 MHz |
Pulse duration | 1 µs | Pulse repetition frequency | 500 Hz | |
Sampling frequency | 220 MHz | Synthetic aperture time | 3.66 s | |
GEO Satellite | Orbital semi-major axis | 42,164 km | Orbital eccentricity | 0.005 |
Orbital inclination | 57° | Perigee argument | 90° | |
Initial coordinates | (1.5, −3.5, 0.25) × 107 m | Normal velocity | 1424.3 m/s | |
UAV | Height | 500 m | Normal velocity | 300 m/s |
Initial coordinates | (0, 0, 500) m |
IRW (m) | PSLR (dB) | ISLR (dB) | |||||
---|---|---|---|---|---|---|---|
Azimuth | Range | Azimuth | Range | Azimuth | Range | ||
Target A | Bistatic BP | 0.96 | 0.68 | −15.31 | −15.49 | −12.05 | −13.35 |
Bistatic EP FFBP | 0.97 | 0.73 | −15.16 | −18.66 | −12.03 | −16.79 | |
Proposed bistatic FFBP | 0.98 | 0.74 | −15.29 | −18.65 | −11.90 | −16.68 | |
Target B | Bistatic BP | 0.95 | 0.69 | −15.37 | −15.48 | −12.01 | −13.32 |
Bistatic EP FFBP | 0.96 | 0.74 | −15.16 | −18.59 | −11.89 | −16.78 | |
Proposed bistatic FFBP | 0.97 | 0.74 | −14.23 | −18.58 | −11.61 | −16.68 | |
Target C | Bistatic BP | 0.95 | 0.69 | −15.40 | −15.51 | −11.85 | −13.34 |
Bistatic EP FFBP | 0.95 | 0.74 | −15.28 | −18.66 | −11.84 | −16.80 | |
Proposed bistatic FFBP | 0.96 | 0.73 | −15.89 | −18.72 | −12.02 | −16.71 |
Imaging Scene Size (Azimuth × Range) | Bistatic BP | Bistatic EP FFBP | Proposed Bistatic FFBP | Speed-Up Factor (BP/EP FFBP) |
---|---|---|---|---|
(100 × 100) m | 12.69 s | 7.67 s | 6.82 s | 1.86/1.12 |
(300 × 300) m | 84.13 s | 19.63 s | 15.88 s | 5.30/1.24 |
(500 × 500) m | 219.53 s | 36.58 s | 29.11 s | 7.61/1.26 |
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Hu, X.; Xie, H.; Zhang, L.; Hu, J.; He, J.; Yi, S.; Jiang, H.; Xie, K. Fast Factorized Backprojection Algorithm in Orthogonal Elliptical Coordinate System for Ocean Scenes Imaging Using Geosynchronous Spaceborne–Airborne VHF UWB Bistatic SAR. Remote Sens. 2023, 15, 2215. https://doi.org/10.3390/rs15082215
Hu X, Xie H, Zhang L, Hu J, He J, Yi S, Jiang H, Xie K. Fast Factorized Backprojection Algorithm in Orthogonal Elliptical Coordinate System for Ocean Scenes Imaging Using Geosynchronous Spaceborne–Airborne VHF UWB Bistatic SAR. Remote Sensing. 2023; 15(8):2215. https://doi.org/10.3390/rs15082215
Chicago/Turabian StyleHu, Xiao, Hongtu Xie, Lin Zhang, Jun Hu, Jinfeng He, Shiliang Yi, Hejun Jiang, and Kai Xie. 2023. "Fast Factorized Backprojection Algorithm in Orthogonal Elliptical Coordinate System for Ocean Scenes Imaging Using Geosynchronous Spaceborne–Airborne VHF UWB Bistatic SAR" Remote Sensing 15, no. 8: 2215. https://doi.org/10.3390/rs15082215