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Proceedings Paper

An eye-safe coherent lidar for speed measurement
Author(s): Zongfeng Ma; Chunxi Zhang; Pan Ou; Guangming Luo; Jiqiang Wang; Tian Lan
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Paper Abstract

An eye-safe, coherent Doppler Light Detection and Ranging (CDL) system for speed measurement under development at BUAA's School of Instrument Science and Opto-electronics Engineering is introduced in this paper. It consists of a 1.55-μm Er-doped fiber laser transmitter, a monostatic optical antenna, a single-mode fiber (SMF) interferometer, an InGaAs photodiode detector, and signal processing equipments. All devices of optical circuit are connected by SMFs making the system reliable and setup arrangement flexible. The goal is to give the evaluations of the Doppler frequency shift and platform speed. Since the speed accuracy is time-independent, the CDL system can be used for integrated navigation system. The quality of Doppler-shift estimation by a spectrum analysis technique, fast Fourier transform (FFT) algorithms, ameliorates as the signal-to-noise ratio (SNR) increases. For the developed CDL system incorporating with SMF interferometer, only the light beam of mode LP01 is permitted to propagate, therefore the SNR is improved greatly. Experiments were performed on a moving hard target with the CDL system and the results were presented.

Paper Details

Date Published: 22 February 2008
PDF: 7 pages
Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 662211 (22 February 2008); doi: 10.1117/12.790816
Show Author Affiliations
Zongfeng Ma, Beijing Univ. of Aeronautics and Astronautics (China)
Chunxi Zhang, Beijing Univ. of Aeronautics and Astronautics (China)
Pan Ou, Beijing Univ. of Aeronautics and Astronautics (China)
Guangming Luo, Beijing Univ. of Aeronautics and Astronautics (China)
Jiqiang Wang, Beijing Univ. of Aeronautics and Astronautics (China)
Tian Lan, Beijing Univ. of Aeronautics and Astronautics (China)


Published in SPIE Proceedings Vol. 6622:
International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology

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