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:doi:10.3788/COL201715.102801

Chinese Optics Letters, 2017, 15 (10): 102801, Published Online: Jul. 19, 2018

Imaging process and signal-to-noise ratio improvement of enhanced self-heterodyne synthetic aperture imaging ladar Download： 816次

Guo Zhang ^1,2Jianfeng Sun ^1,*Yu Zhou ¹Zhiyong Lu ¹Guangyuan Li ^1,2Guangyu Cai ^1,2Mengmeng Xu ^1,2Bo Zhang ^1,2Chenzhe Lao ^1,2Hongyu He ^1,2Liren Liu ¹

Author Affiliations

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

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

Figures & Tables

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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Table1. 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

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Table2. 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.

Imaging process and signal-to-noise ratio improvement of enhanced self-heterodyne synthetic aperture imaging ladar Download： 816次

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

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.

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

Table1. SNR of Point Target Final Image in Enhanced Self-heterodyne SAIL System

Table2. SNR of Point Target Final Image in Down-looking SAIL

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Imaging process and signal-to-noise ratio improvement of enhanced self-heterodyne synthetic aperture imaging ladar Download： 816次

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

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.

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

Table1. SNR of Point Target Final Image in Enhanced Self-heterodyne SAIL System

Table2. SNR of Point Target Final Image in Down-looking SAIL

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