14 November 2016 Doppler laser radar for range and speed measurement of road targets
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Abstract
A pulsed coherent vehicle laser radar system basing on the measurement of light flight time and Doppler frequency shift is demonstrated for the first time, which features a simple design that uses one photodiode (PD) as its optical detector. Pseudo random noise (PN) code is used for modulating the amplitude of transmitting light. Correlation function of the received echoes and the local modulating codes is calculated for measuring the light flight time. Due to PN code modulation, beat signal output from PD is piecewise continuous, which causes equidistant sampling of Doppler sine wave not feasible. In order that Doppler frequency be correctly measured by using fast Fourier transform (FFT), a simple signal amplitude modification method is derived from the definition of Fourier transform.
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Yanfang Lin, Yanfang Lin, Xuesong Mao, Xuesong Mao, Jianchao Fang, Jianchao Fang, Tao Zhang, Tao Zhang, } "Doppler laser radar for range and speed measurement of road targets", Proc. SPIE 10025, Advanced Sensor Systems and Applications VII, 100250G (14 November 2016); doi: 10.1117/12.2245136; https://doi.org/10.1117/12.2245136
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