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| Citation: | WANG Bingnan, ZHAO Juanying, LI Wei, et al. Array synthetic aperture ladar with high spatial resolution technology[J]. Journal of Radars, 2022, 11(6): 1110–1118. doi: 10.12000/JR22204
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Array Synthetic Aperture Ladar with High Spatial Resolution Technology
DOI: 10.12000/JR22204
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Abstract
By extending synthetic aperture technology from the microwave band to the laser wavelength, Synthetic Aperture Ladar (SAL) has long-distance imaging and extremely high spatial resolution independent of the target distance. Presently, the small field of view is the key constraint in SAL ground observation because of the laser diffraction limitation. In this paper, an array SAL technology is proposed. With high-power array transmission, array-balanced detection, and pulse-wise dynamic internal calibration, a multichannel coherent laser transceiver is realized. Meanwhile, the field of view has multiplied. The results of turntable experiments show that the imaging resolution is better than 3 cm (distance) × 1 cm (azimuth). This technology provides a scientific and technical approach to SAL with wider swath imaging in ground observation.-
Keywords:
- Array,
- Synthetic Aperture Ladar (SAL),
- High resolution,
- Wide swath
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References
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- Figure 1. Geometric diagram of array SAL
- Figure 2. The ISAL imaging model of single spot
- Figure 3. Schematic diagram of array optical system
- Figure 4. Configuration of optical fiber array
- Figure 5. Schematic diagram of far field array elliptical laser beam distribution
- Figure 6. Ten channels array balanced detection unit (each unit contains four detectors, which receive a laser beam from the far field)
- Figure 7. ISAL prototype in lab
- Figure 8. The imaging scene of point target
- Figure 9. Schematic diagram of ISAL and turntable device
- Figure 10. The imaging scene of “yue”
- Figure 11. The imaging scene of “E”
- Figure 12. The imaging scene of “AIRCAS”
- Figure 13. The imaging result of target “E” and “AIRCAS”