An improved equivalent acceleration imaging approach for spaceborne sliding spotlight SAR
Source abstract
Abstract
The traditional hyperbolic range equation model will produce large errors in the spaceborne sliding spotlight synthetic aperture radar with large azimuth time. Although the equivalent acceleration range model (EARM) can deal with the problem of large azimuth scenes well, the interpolation steps from azimuth resampling make the computational burden of algorithm very huge. In response to this problem, this paper improves EARM by dividing the range model into two parts: residual terms of azimuth time and equivalent range expression. The frequency domain imaging algorithm designed for the new range model omits the interpolation step of azimuth resampling. The simulation experiments verify the efficiency and validity of the proposed methodology.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced SAR Imaging Techniques · Synthetic Aperture Radar (SAR) Applications and Techniques · Microwave Imaging and Scattering Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology 1 , Nanjing 210094, China
School of Electronics and Information, JiangSu University of Science and Technology 2 , Zhenjiang 212100, China
School of Electronic and Optical Engineering, Nanjing University of Science and Technology 3 , Nanjing 210094, China
Funding
National Natural Science Foundation of China
References (46)
Show source-provided references
1. A novel azimuth spectrum reconstruction and imaging method for moving targets in geosynchronous spaceborne–airborne bistatic multichannel SAR10.1109/TGRS.2020.2974531 ↗
2. Simultaneous single-/dual- and quad-pol SAR imaging over swaths of different widths10.1109/TGRS.2019.2953098 ↗
3. Improving SAR data processing with polarimetric reference functions in the range Doppler algorithm10.1080/01431161.2017.1362126 ↗
4. Overview of techniques for improving high-resolution spaceborne SAR imaging and image quality10.12000/JR19085 ↗
5. Forthcoming spaceborne SAR development10.12000/JR20008 ↗
6. A review of imaging algorithms in multi-platform-borne synthetic aperture radar10.12000/JR19102 ↗
7. Medium-earth-orbit SAR focusing using range Doppler algorithm with integrated two-step azimuth perturbation10.1109/LGRS.2014.2353674 ↗
8. Modified range-Doppler algorithm for high squint SAR echo processing10.1109/LGRS.2018.2873680 ↗
9. Comparison between back projection algorithm and range migration algorithm in terahertz imaging10.1109/ACCESS.2020.2968085 ↗
10. Millimeter-wave sparse imaging for concealed objects based on sparse range migration algorithm10.1109/JSEN.2019.2912642 ↗
11. A dictionary-based SAR RFI suppression method via robust PCA and chirp scaling algorithm10.1109/LGRS.2020.2997947 ↗
12. Interpolation free wide nonlinear chirp scaling algorithm for spaceborne stripmap range sweep SAR imaging10.1109/LGRS.2019.2930537 ↗
13. A channel calibration method based on weighted backprojection algorithm for multichannel SAR imaging10.1109/LGRS.2019.2894731 ↗
14. Geosynchronous spaceborne–airborne multichannel bistatic SAR imaging using weighted fast factorized backprojection method10.1109/LGRS.2019.2902036 ↗
15. Motion compensation for terahertz synthetic aperture radar based on subaperture decomposition and minimum entropy theorem10.1109/JSEN.2020.3010086 ↗
16. A novel motion compensation approach based on symmetric triangle wave interferometry for UAV SAR imagery10.1109/ACCESS.2020.2999908 ↗
17. A novel motion compensation method based on height term removing for spotlight SAR on circular trajectories10.1109/JSEN.2019.2952742 ↗
18. A modified factorized geometrical autofocus method for wide angle SAR10.1109/JSTARS.2020.3045477 ↗
19. Performance analysis of autofocus algorithms for compensating ionospheric dispersion effect on spaceborne low-frequency SAR focusing10.1109/LGRS.2020.2970720 ↗
20. Kalman filter disciplined phase gradient autofocus for stripmap SAR10.1109/TGRS.2020.2976655 ↗
21. A robust motion compensation approach for UAV SAR imagery10.1109/TGRS.2011.2180392 ↗
22. Wavenumber-domain autofocusing for highly squinted UAV SAR imagery10.1109/JSEN.2011.2175216 ↗
23. Robust autofocusing approach for highly squinted SAR imagery using the extended wavenumber algorithm10.1109/TGRS.2013.2276112 ↗
24. Knowledge-aided two-dimensional autofocus for synthetic aperture radar
25. A two-dimensional beam-steering method to simultaneously consider Doppler centroid and ground observation in GEOSAR10.1109/JSTARS.2016.2544349 ↗
26. A new method of zero-Doppler centroid control in GEO SAR10.1109/LGRS.2010.2089969 ↗
27. A high-order imaging algorithm for high-resolution spaceborne SAR based on a modified equivalent squint range model10.1109/TGRS.2014.2336241 ↗
28. On the processing of very high resolution spaceborne SAR data10.1109/TGRS.2013.2294353 ↗
29. Processing of very high resolution spaceborne sliding spotlight SAR data using velocity scaling10.1109/TGRS.2015.2481923 ↗
30. Full-aperture focusing of very high resolution spaceborne-squinted sliding spotlight SAR data10.1109/TGRS.2017.2669205 ↗
31. A two-dimensional spectrum for bistatic SAR processing using series reversion10.1109/LGRS.2006.885862 ↗
32. Focusing improvement of curved trajectory spaceborne SAR based on optimal LRWC preprocessing and 2-D singular value decomposition10.1109/TGRS.2018.2890294 ↗
33. High-resolution spaceborne SAR processing using the decomposed transfer function10.1109/TAES.2017.2687199 ↗
34. Efficient space-variant motion compensation approach for ultra-high-resolution SAR based on subswath processing10.1109/JSTARS.2018.2799601 ↗
35. Study of phase error reconstruction and motion compensation for terahertz SAR with sparsity-promoting parameter estimation10.1109/TTHZ.2020.3036180 ↗
36. A new fourth-order processing algorithm for spaceborne SAR10.1109/7.705890 ↗
37. A new fourth order SAR processing algorithm for very high resolution
38. A novel high-order range model and imaging approach for high-resolution LEO SAR10.1109/TGRS.2013.2273086 ↗
39. Acceleration model analyses and imaging algorithm for highly squinted airborne spotlight-mode SAR with maneuvers10.1109/JSTARS.2015.2399103 ↗
40. Spotlight SAR data focusing based on a two-step processing approach10.1109/36.951090 ↗
41. New approach for hybrid strip-map/spotlight SAR data focusing10.1049/ip-rsn:20010662 ↗
42. Full-aperture SAR data focusing in the spaceborne squinted sliding-spotlight mode10.1109/TGRS.2013.2282863 ↗
43. Processing of sliding spotlight and TOPS SAR data using baseband azimuth scaling10.1109/TGRS.2009.2027701 ↗
44. Moving target focusing in SAR imagery based on subaperture processing and DART10.1109/LGRS.2020.2973025 ↗
45. Extended two-step focusing approach for squinted spotlight SAR imaging10.1109/TGRS.2011.2174460 ↗
46. SAR data focusing using seismic migration techniques10.1109/7.78293 ↗