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| Citation: | Li Daojing, Hu Xuan. Optical System and Detection Range Analysis of Synthetic Aperture Ladar[J]. Journal of Radars, 2018, 7(2): 263-274. doi: 10.12000/JR18017
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Optical System and Detection Range Analysis of Synthetic Aperture Ladar
DOI: 10.12000/JR18017
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Abstract
Optical system and detection range of Synthetic Aperture Ladar (SAL) are analyzed. According to the imaging characteristics of SAL, the concept that SAL uses non-imaging diffractive optical system are proposed, meanwhile, the phased array model is introduced to analyze its performance. In the condition of using binary optical element on the feeder and primary mirror, the phaser parameters and beam pattern are presented using simulation. The signal of 2° view field is introduced into fiber with the 300 mm aperture telescope and compressed optical path. The radar detection range equation of SAL is introduced, coherent detection and signal accumulation gain are analyzed, the conclusion is SAL has good ability of detecting weak signal. Aiming at application requirement, system parameters and working modes of airborne SAL are given with high resolution and long detection range. With 5 cm resolution, the airborne SAL can achieve 5 km detection range with 1.5 km swath in strip-map imaging mode and 10 km detection range with 1 km swath in sliding spotlight imaging mode. -
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References
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- Figure 1. Side-looking observation geometry of SAL
- Figure 2. The relationship among object signal direction, range and time in the view field of SAL
- Figure 3. Geometry structure of fiber collimator
- Figure 4. Diagram of introducing wide view field signal into fiber based on phased array
- Figure 5. Diagram of introducing wide view field signal into fiber based on nanophotonic waveguide array and space higher-order phaser
- Figure 6. Diagram of introducing wide view field signal into fiber based on fiber collimator and space higher-order phaser
- Figure 7. Desired second-order phase and the related broading beam pattern
- Figure 8. Second-order phase with 8 quantization bits and the related broading beam pattern
- Figure 9. Second-order phase with 16 quantization bits and the related broading beam pattern
- Figure 10. Diagram of diffractive optical system in which the binary optical element is used both on the feeder and primary mirror
- Figure 11. The phase, folded phase and beam pattern of the diffractive primary mirror
- Figure 12. The primary mirror phase with 8 quantization bits and the related beam pattern
- Figure 13. Scanning model of airborne SAL (Double the swath through scanning)
- Figure 14. Scanning order of airborne SAL strip-map imaging model and related beam scope