Research on Space-Borne Dual-Wavelength Land-Sea LiDAR System with 2 m Diffractive Aperture

Daojing Li; Jinghan Gao; Anjing Cui; Kai Zhou; Jiang Wu

doi:10.3788/CJL202249.0310001

Chinese Journal of Lasers, Volume. 49, Issue 3, 0310001(2022)

Research on Space-Borne Dual-Wavelength Land-Sea LiDAR System with 2 m Diffractive Aperture

Daojing Li^1、*, Jinghan Gao^1,2, Anjing Cui^1,2, Kai Zhou^1,2, and Jiang Wu^1,2

¹National Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China

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

show less

Abstract Get PDF(in Chinese)

Figures & Tables(11)

Fig. 1. Overall structural diagram of dual wavelength lidar

Download full size

$Layout diagrams of transceiver optical system. (a) Large aperture diffractive optical system; (b) synthetic aperture diffractive optical system$

Fig. 2. Layout diagrams of transceiver optical system. (a) Large aperture diffractive optical system; (b) synthetic aperture diffractive optical system

Download full size

$Optical path difference folded fringes, PSFs and MTFs of large aperture and optical synthetic aperture diffractive primary mirrors$

Fig. 3. Optical path difference folded fringes, PSFs and MTFs of large aperture and optical synthetic aperture diffractive primary mirrors

Download full size

Fig. 4. Schematic of laser beam scanning mode

Download full size

Fig. 5. Relationship between F(h′) and h′

Download full size

$Optical synthetic aperture diffractive primary mirror of coherent detector array based on laser local oscillator$

Fig. 6. Optical synthetic aperture diffractive primary mirror of coherent detector array based on laser local oscillator

Download full size

Fig. 7. 3D imaging results in normal direction. (a)(c) 1 sub-aperture; (b)(d) 12 sub-apertures

Download full size

Fig. 8. 3D imaging results of 4 mrad off normal. (a)(c) 1 sub-aperture; (b)(d) 12 sub-apertures

Download full size

Fig. 9. Timing sequence of transmitted signal and echo signal at pulse repetition rate of 2 kHz

Download full size

Table 1. System parameters of space-borne lidar

View table

Table 1. System parameters of space-borne lidar

Parameter	Value	Parameter	Value
R	500 km	PRF	2 kHz
P_t	30 MW for narrow pulse, and 1.5 kW for broad pulse	θ_c	8 mrad (land), and 8 μrad (ocean)
T_p	5 ns for narrow pulse, and 100 μs for broad pulse	θ_a	80 μrad (land), and 8 μrad (ocean)
B_r	200 MHz for narrow pulse, and 500 MHz for broad pulse	FOV	8 μrad (land), and 80 μrad (ocean)
D	2 m	A_r	2.36 m²
ρ_c	4 m	ρ_a	4 m
σ₀	0.2	Ω	π
η_ato	0.2	F_n	3 dB
η_ele	0.5	η_opt	0.3

Table 2. Parameters of marine characteristics of lidar
View table
Table 2. Parameters of marine characteristics of lidar
Parameter Value Parameter Value
b_f 0.4 α 0.08
m 8 ρ_w 0.02
n 1.34 θ_w / rad 0

Tools

Get Citation

Copy Citation Text

Daojing Li, Jinghan Gao, Anjing Cui, Kai Zhou, Jiang Wu. Research on Space-Borne Dual-Wavelength Land-Sea LiDAR System with 2 m Diffractive Aperture[J]. Chinese Journal of Lasers, 2022, 49(3): 0310001

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites