Incoherent pulse compression in laser range finder

Daniel Grodensky, Daniel Kravitz, Nadav Arbel, Nadav Levanon, Avinoam Zadok

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publicationLaser Radar Technology and Applications XIX; and Atmospheric Propagation XI
PublisherSPIE
ISBN (Print)9781628410174
DOIs
StatePublished - 2014
EventLaser Radar Technology and Applications XIX; and Atmospheric Propagation XI - Baltimore, MD, United States
Duration: 6 May 20147 May 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9080
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceLaser Radar Technology and Applications XIX; and Atmospheric Propagation XI
Country/TerritoryUnited States
CityBaltimore, MD
Period6/05/147/05/14

Keywords

  • Complementary code pairs
  • LADAR
  • Laser ranging
  • Matched filtering
  • Optical signal processing
  • Pulse compression

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