Effect of phasing-sector angular extent in FM reticles

Ronald G. Driggers, Carl E. Halford, Martin M. Meads, Glenn D. Boreman

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A technique is presented for increasing the useful power of the FM modulation signal from a spinning FM reticle with a phasing sector. Spinning FM reticles often determine a target location by using a combination of a phasing sector to establish the angular target location and a radial frequency variation to establish the radial target location. Typically, the phasing sector of this reticle type consists of a semicircular transmissive sector with the other semicircular sector which provides FM modulation. The power of the FM modulation signal is increased by matching the phased-sector geometry to the size that corresponds to the period of the modulation frequency. This type of reticle is compared and contrasted with the more typical semicircular phasing-sector reticle in both the time and frequency domains.

Original languageEnglish (US)
Pages (from-to)4578-4581
Number of pages4
JournalApplied optics
Issue number22
StatePublished - Aug 1992
Externally publishedYes


  • Frequency modulation
  • Phase modulation
  • Reticles

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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