Abstract

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.

© 1992 Optical Society of America

Parameters of spinning FM reticles

Ronald G. Driggers, Carl E. Halford, Glenn D. Boreman, Douglas Lattman, and Kevin F. Williams
Appl. Opt. 30(7) 887-895 (1991)

Comparison of continuous and discrete frequency-versus-radius frequency-modulated reticles

James S. Taylor, Ronald G. Driggers, Carl E. Halford, Jeffrey S. Sanders, Steven T. Griffin, and Michael Wellfare
Appl. Opt. 31(10) 1638-1640 (1992)

Parameters of spinning AM reticles

Ronald G. Driggers, Carl E. Halford, and Glenn D. Boreman
Appl. Opt. 30(19) 2675-2684 (1991)

Comparison of AM and FM Reticle Systems

Robert O’B. Carpenter
Appl. Opt. 2(3) 229-236 (1963)

Effects of speckle on the range precision of a scanning lidar

Jon Y. Wang and P. Andrew Pruitt
Appl. Opt. 31(6) 801-808 (1992)