Journal of Systems Engineering and Electronics ›› 2021, Vol. 32 ›› Issue (3): 545-558.doi: 10.23919/JSEE.2021.000046
• ELECTRONICS TECHNOLOGY • Previous Articles Next Articles
Xuying XIONG(
), Gen LI*(), Yanheng MA(), Lina CHU()
Received:2020-08-07
Online:2021-06-18
Published:2021-07-26
Contact:
Gen LI
E-mail:grabrielle@foxmail.com;radarlg@126.com;mamyh11@126.com;1052503919@qq.com
About author:Supported by:Xuying XIONG, Gen LI, Yanheng MA, Lina CHU. New slant range model and azimuth perturbation resampling based high-squint maneuvering platform SAR imaging[J]. Journal of Systems Engineering and Electronics, 2021, 32(3): 545-558.
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Fig 1
Geometric model of highly squinted SAR with a curved trajectory"
Fig 2
Taylor expansion error analysis of ${{{R}}_{{p}}}({{{t}}_{{a}}};{{{R}}_{{0}}},{{{t}}_{{n}}})$ at ${{{t}}_{{a}}} = {{{t}}_{{n}}}$ "
Fig 2
"
Table 1
Simulation parameters"
| Simulation parameter | Value | Simulation parameter | Value | |
| Carrier frequency/GHz | 17 | Squint angle/(°) | 60 | |
| Range bandwidth/MHz | 200 | Platform height/km | 5 | |
| Synthetic aperture time/s | 2 | Centre slant range/km | 12 | |
| Pulse width/μs | 3 | Platform velocity/(m/s) | (150, 0, ?35) | |
| Pulse repeat frequency/kHz | 1 | Platform acceleration/(m/s2) | (3.2, 1.2, ?0.8) |
Fig 3
Taylor expansion error analysis of ${{{R}}_{{p}}}\left( {{{{t}}_{{a}}};{{{R}}_{{0}}}\left( {{{{R}}_{\bf{new} }},{{{t}}_{{n}}}} \right),{{{t}}_{{n}}}} \right)$ at ${{{{t}}_{{a}}} = {{0}}}$ "
Fig 4
Analysis of the maximum spatial-variant phase"
Fig 5
Effective imaging regions on the focused plane and the ground plane"
Fig 6
Flow chart of imaging algorithm for high-squint SAR mounted on maneuvering platforms"
Fig 7
Targets distribution diagram for maneuvering SAR imaging"
Fig 8
Contour maps of the scattering points 1,2,3"
Table 2
Performance analysis of the selected targets"
| Measured parameter | Theoretical value | Target 1 | Target 2 | Target 3 | |||||
| Reference method | Proposed method | Reference method | Proposed method | Reference method | Proposed method | ||||
| Resolution/m | 0.88 | 2.75 | 0.80 | 0.88 | 0.88 | 1.29 | 0.92 | ||
| PSLR/dB | ?13.26 | ?1.36 | ?12.95 | ?13.26 | ?13.26 | ?5.03 | ?13.01 | ||
| ISLR/dB | ?9.80 | ?1.45 | ?10.15 | ?9.79 | ?9.79 | ?3.96 | ?10.06 | ||
Fig 9
Azimuth profiles of the focused point target 1"
Fig 10
Results of geometric distortion correction"
Fig 11
Imaging results of the simulated real scene"
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