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Proceedings Paper

Heterodyne CO2 Laser Rangefinder With Chirp Signal Processing
Author(s): K. F. Hulme; B. S. Collins
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Paper 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.

Paper Details

Date Published: 15 May 1981
PDF: 4 pages
Proc. SPIE 0236, 1980 European Conf on Optical Systems and Applications, (15 May 1981); doi: 10.1117/12.958999
Show Author Affiliations
K. F. Hulme, Royal Signals and Radar Establishment (United Kindgom)
B. S. Collins, Royal Signals and Radar Establishment (United Kindgom)


Published in SPIE Proceedings Vol. 0236:
1980 European Conf on Optical Systems and Applications
D. J. Kroon, Editor(s)

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