The Retinal Image of the Fresnel Lens Optical Landing System.
Abstract
The theory and geometry by which the Fresnel Lens Optical Landing System (FLOLS) provides glideslope information to the pilot attempting a carrier landing is described. From the theory, geometry, and the linear spatial dimensions of the FLOLS, the image it generates on the retina of the pilot is calculated. Since the dimensions of the retinal image are a function of the distance of the eye from the FLOLS, dimensions are calculated for distances of 1.0, 0.5, 0.25, and 0.125 nautical miles from the carrier ramp and at the ramp itself. These dimensions are also considered as a functions of time in seconds to the ramp, assuming an aircraft airspeed of 125 knots. The dimensions of the retinal image of the FLOLS vary with the FLOLS position on the carrier. Calculations are reported for the USS LEXINGTON (AVT-16) and the USS KITTY HAWK (CV-63). The retinal image of the FLOLS is discussed as a visual stimulus for acuity discriminations and compared to acuity measured in the laboratory. The impact of the addition of the rate descent arrows, AVCARS, on FLOLS visibility is discussed in terms of the calculated dimensions of the retinal image and known neurophysiology. A modification of the current FLOLS display is suggested, which would increase its visibility, gain, and usable range.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 19, 1986
- Accession Number
- ADA176090
Entities
People
- Leonard A. Temme
- William A. Monaco
Organizations
- Naval Aerospace Medical Research Laboratory