An eye-safe coherent lidar for speed measurement

Zongfeng Ma; Chunxi Zhang; Pan Ou; Guangming Luo; Jiqiang Wang; Tian Lan

doi:10.1117/12.790816

22 February 2008 An eye-safe coherent lidar for speed measurement

Zongfeng Ma, Chunxi Zhang, Pan Ou, Guangming Luo, Jiqiang Wang, Tian Lan

Proceedings Volume 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology; 662211 (2008) https://doi.org/10.1117/12.790816
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

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.

Citation Download Citation

Zongfeng Ma, Chunxi Zhang, Pan Ou, Guangming Luo, Jiqiang Wang, and Tian Lan "An eye-safe coherent lidar for speed measurement", Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 662211 (22 February 2008); https://doi.org/10.1117/12.790816

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KEYWORDS

Doppler effect

LIDAR

Signal to noise ratio

Sensors

Signal processing

Single mode fibers

Navigation systems

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