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Proceedings Paper

CO[sub]2[/sub] Ladar Modulation Trade-Off Studies
Author(s): Albert H. Reynolds III
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Paper Abstract

A model has been developed for calculating the CO2 ladar heterodyne mixing current for an arbitrary modulation format. Six specific techniques are considered including amplitude (AM/CW), suppressed-carrier amplitude (AM/SC), phase (PM/CW), linear frequency (FM/CW), hybrid linear frequency/suppressed-carrier amplitude (FM/SC), and short pulse (PULSE) modulation. Detailed models of the different modulators and demodulator concepts are included in the analysis. Laser efficiency, signal bandwidth, detection rate, and sensitivity to speckle effects (especially phase jitter) are discussed as they affect range measurement precision and accuracy. Theoretical and preliminary experimental results indicate that a PM/CW ladar has a 3-6 dB advantage in signal-to-noise ratio over the AM-based formats. The results also indicate improved performance for a PULSE ladar compared with CW ladars if sufficient transmitter efficiencies can be achieved, and that the FM/CW and FM/SC formats are relatively unsuited for high-precision or high-accuracy range imaging.

Paper Details

Date Published: 13 December 1983
PDF: 11 pages
Proc. SPIE 0415, Coherent Infrared Radar Systems and Applications II, (13 December 1983); doi: 10.1117/12.935909
Show Author Affiliations
Albert H. Reynolds III, McDonnell Douglas Astronautics Company (United States)

Published in SPIE Proceedings Vol. 0415:
Coherent Infrared Radar Systems and Applications II
Robert C. Harney, Editor(s)

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