15 May 1981 Heterodyne CO2 Laser Rangefinder With Chirp Signal Processing
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Proceedings Volume 0236, 1980 European Conf on Optical Systems and Applications; (1981) https://doi.org/10.1117/12.958999
Event: 1980 European Conference on Optical Systems and Applications, 1980, Utrecht, Netherlands
Abstract
A novel type of laser rangefinder,based on a CW CO2 laser and a specially-designed acousto-optic modulator,applies microwave signal processing concepts in the 10 micron spectral region. We used )4 microsecond duration, 14 MHz bandwidth chirp pulses and surface-acoustic-wave (SAW) expander and compressor devices. Compact optical design with a range capability of several kilometres is obtained by digitally integrating many returns processed at the rate of 30,000 returns per second. In chirp systems,moving targets produce, via the Doppler effect, a range error (8m per ms-1 our case), but, by using up-chirp and down-chirp waveforms, which produce opposite-sign errors, we determined both the range and radial velocity of moving targets.
© (1981) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
K. F. Hulme, B. S. Collins, "Heterodyne CO2 Laser Rangefinder With Chirp Signal Processing", Proc. SPIE 0236, 1980 European Conf on Optical Systems and Applications, (15 May 1981); doi: 10.1117/12.958999; https://doi.org/10.1117/12.958999
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