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Proceedings Paper

Incoherent pulse compression in laser range finder
Author(s): Daniel Grodensky; Daniel Kravitz; Nadav Arbel; Nadav Levanon; Avinoam Zadok
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Paper Abstract

Laser ranging measurements using incoherent pulse compression of complementary code pairs is reported. The two bipolar codes are converted to unipolar representations using a pulse position modulation algorithm, and used in succession in intensity modulation of a laser ranging source. Reflected echoes from a wall target are directly and incoherently detected. The cross-correlation between each of the two collected echoes and its respective, reference bipolar sequence, that is digitally stored at the receiver, is calculated. The two correlation functions are then added together. The off-peak aperiodic correlation functions of two codes sum up to zero, hence they are particularly suitable for low-sidelobe radar and laser ranging and detection systems. The scheme does not require the preservation of phase information in transmission or reception and provides superior sidelobe suppression compared with that of longer single codes. The code pairs are scalable to arbitrary lengths through simple procedures. Simulated and experimental ranging measurements in the presence of additive noise are discussed. The distance to the target could be recovered based on weak collected echoes, with an average optical power as low as 2 nW, without averaging over repeating measurements.

Paper Details

Date Published: 9 June 2014
PDF: 6 pages
Proc. SPIE 9080, Laser Radar Technology and Applications XIX; and Atmospheric Propagation XI, 90800M (9 June 2014); doi: 10.1117/12.2050092
Show Author Affiliations
Daniel Grodensky, Bar-Ilan Univ. (Israel)
Daniel Kravitz, Bar-Ilan Univ. (Israel)
Nadav Arbel, Bar-Ilan Univ. (Israel)
Nadav Levanon, Tel Aviv Univ. (Israel)
Avinoam Zadok, Bar-Ilan Univ. (Israel)

Published in SPIE Proceedings Vol. 9080:
Laser Radar Technology and Applications XIX; and Atmospheric Propagation XI
Monte D. Turner; Linda M. Wasiczko Thomas; Gary W. Kamerman; Earl J. Spillar, Editor(s)

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