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High-resolution random-modulation cw lidar

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Abstract

A high-resolution random-modulation continuous wave lidar for surface detection using a semiconductor laser diode is presented. The laser diode is intensity modulated with the pseudorandom binary sequence. Its enhanced resolution is achieved via interpolation and a novel front-end analog technique, lowering the requirement of the analog-to-digital converter sampling rate and the associated circuitry. Its mathematical model is presented, including the derivation of the signal-to-noise ratio and the distance standard deviation. Analytical and experimental results demonstrate its capability to achieve distance accuracy of less than 2cm within 2.6ms acquisition time, over distances ranging from 1 to 12m. The laser diode emits 1.4mW of optical power at a wavelength of 635nm.

© 2011 Optical Society of America

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