Imaging process and signal-to-noise ratio improvement of enhanced self-heterodyne synthetic aperture imaging ladar

Guo Zhang; Jianfeng Sun; Yu Zhou; Zhiyong Lu; Guangyuan Li; Guangyu Cai; Mengmeng Xu; Bo Zhang; Chenzhe Lao; Hongyu He; Liren Liu

doi:10.3788/COL201715.102801

Chinese Optics Letters, Volume. 15, Issue 10, 102801(2017)

Imaging process and signal-to-noise ratio improvement of enhanced self-heterodyne synthetic aperture imaging ladar

Guo Zhang^1,2, Jianfeng Sun^1、*, Yu Zhou¹, Zhiyong Lu¹, Guangyuan Li^1,2, Guangyu Cai^1,2, Mengmeng Xu^1,2, Bo Zhang^1,2, Chenzhe Lao^1,2, Hongyu He^1,2, and Liren Liu¹

Author Affiliations

¹Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800, China

²University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(8)

Fig. 1. Structure of the enhanced self-heterodyne SAIL system. PBS: polarizing beam splitter; WP: wave plate.

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Fig. 2. Configuration to translate the wavefront using cylindrical lenses; x means the cylindrical lenses L1 and L2 are moving in the direction orthogonal to the direction of travel, y means the cylindrical lenses L3 and L4 are moving in the travel direction.

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Fig. 3. (a) Magnitude and (b) phase distributions of the focused image in the orthogonal direction of travel and (c) a 2D image focused subsequently in the travel direction for a $0.3 mm \times 0.3 mm$ point target. The distribution of the final image is (d) in orthogonal direction and (e) in the travel direction for a $0.3 mm \times 0.3 mm$ point target.

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Fig. 4. (a), (b), and (c) are the final images for a $0.3 mm \times 0.3 mm$ point target at output power of 15 mW, 2 mW, and 750 μW of the optical fiber amplifier. (d), (e), and (f) are the distribution of the final image in the travel direction for a $0.3 mm \times 0.3 mm$ point target at the output powers of 15 mW, 2 mW, and 750 μW of the optical fiber amplifier.

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Fig. 5. Self-heterodyne receiver in the down-looking SAIL.

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Fig. 6. (a), (b), and (c) are the final images for a $0.3 mm \times 0.3 mm$ point target in the down-looking SAIL at the output powers of 15 mW, 2 mW, and 750 μW of the optical fiber amplifier. (d), (e), and (f) are final images in the travel direction for a $0.3 mm \times 0.3 mm$ point target in the down-looking SAIL at the output powers of 15 mW, 2 mW, and 750 μW of the optical fiber amplifier.

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Table 1. SNR of Point Target Final Image in Enhanced Self-heterodyne SAIL System
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Table 1. SNR of Point Target Final Image in Enhanced Self-heterodyne SAIL System
Output power of the optical fiber amplifier Intensity of point target $I_{p}$ Intensity of noise $σ_{p}$ ${SNR}_{p}$
15 mW 11271 91 124
2 mW 1641 15 109
750 μW 364 6 61

Table 2. SNR of Point Target Final Image in Down-looking SAIL
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Table 2. SNR of Point Target Final Image in Down-looking SAIL
Output power of the optical fiber amplifier Intensity of point target $I_{p}$ Intensity of noise $σ_{p}$ ${SNR}_{p}$
15 mW 375.28 3.87 97
2 mW 61.59 2.37 26
750 μW 15.5 2.46 6

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Guo Zhang, Jianfeng Sun, Yu Zhou, Zhiyong Lu, Guangyuan Li, Guangyu Cai, Mengmeng Xu, Bo Zhang, Chenzhe Lao, Hongyu He, Liren Liu. Imaging process and signal-to-noise ratio improvement of enhanced self-heterodyne synthetic aperture imaging ladar[J]. Chinese Optics Letters, 2017, 15(10): 102801

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