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Author: Fred Pushies
Publisher: Zenith Press
ISBN: 076034986X
Category : History
Languages : en
Pages : 323
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Book Description
Military author and spec ops expert, Fred Pushes, profiles weapons, missions, vehicles, and iconic commandos from the eighteenth-century to now.
Author: Fred Pushies
Publisher: Zenith Press
ISBN: 076034986X
Category : History
Languages : en
Pages : 323
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Book Description
Military author and spec ops expert, Fred Pushes, profiles weapons, missions, vehicles, and iconic commandos from the eighteenth-century to now.
Author:
Publisher:
ISBN:
Category : Night fighting (Military science)
Languages : en
Pages : 54
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Book Description
Author: Robert J. Pleban
Publisher:
ISBN:
Category : Night vision
Languages : en
Pages : 64
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Book Description
"This research examined the capabilities of virtual environments to simulate night vision goggle (NVG) effects. Different solutions for simulating NVG images were assessed. Two conditions simulated NVGs but used different software approaches. Two additional conditions simulated unaided night environments that required soldiers to wear NVGs. Four-man infantry teams conducted urban operation missions under each condition. Objective assessments were obtained on the number of events correctly detected and the average time required to detect an event. Subjective assessments of task difficulty and image fidelity were also made. No significant differences were found across night conditions for either event detection or time. Significant differences in task difficulty ratings occurred for movement, visual detection, and maintaining situation awareness. In general, tasks were more difficult to perform while wearing the NVGs compared to simulated versions of NVG images. Soldiers also ranked the conditions involving actual NVGs as more realistic. The unique contribution of virtual environments for night operations training may be at the entry level. However, specific image fidelity issues associated with the use of NVGs in simulated unaided night environments must be addressed if this approach is to be used as an effective training medium."--Stinet.
Author: United States. Congress. House. Committee on Armed Services. Subcommittee on Investigations
Publisher:
ISBN:
Category : Military helicopters
Languages : en
Pages : 140
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Book Description
Author: R. Hradaynath
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Infrared technology
Languages : en
Pages : 1050
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Book Description
This collection of 104 papers is divided into two parts. Part One, Image Intensification, focuses on developments with image intensified tubes. Part Two, Thermal Imaging, concentrates on the practical applications of night vision technology for its main users: the armed forces.
Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781728939933
Category :
Languages : en
Pages : 42
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Book Description
Night-vision goggles (NVGs) and, in particular, the advanced, helmet-mounted Aviators Night-Vision-Imaging System (ANVIS) allows helicopter pilots to perform low-level flight at night. It consists of light intensifier tubes which amplify low-intensity ambient illumination (star and moon light) and an optical system which together produce a bright image of the scene. However, these NVGs do not turn night into day, and, while they may often provide significant advantages over unaided night flight, they may also result in visual fatigue, high workload, and safety hazards. These problems reflect both system limitations and human-factors issues. A brief description of the technical characteristics of NVGs and of human night-vision capabilities is followed by a description and analysis of specific perceptual problems which occur with the use of NVGs in flight. Some of the issues addressed include: limitations imposed by a restricted field of view; problems related to binocular rivalry; the consequences of inappropriate focusing of the eye; the effects of ambient illumination levels and of various types of terrain on image quality; difficulties in distance and slope estimation; effects of dazzling; and visual fatigue and superimposed symbology. These issues are described and analyzed in terms of their possible consequences on helicopter pilot performance. The additional influence of individual differences among pilots is emphasized. Thermal imaging systems (forward looking infrared (FLIR)) are described briefly and compared to light intensifier systems (NVGs). Many of the phenomena which are described are not readily understood. More research is required to better understand the human-factors problems created by the use of NVGs and other night-vision aids, to enhance system design, and to improve training methods and simulation techniques. Brickner, Michael S. Ames Research Center RTOP 505-67-11...
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 376
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Book Description
This document is a compilation of spectral transmissivity data measured from numerous aircraft transparencies. The spectral transmissivity of each part was measured from wavelengths of 450 nm through 950 nm. Some parts were also measured at several different angles relative to the optical axis of the spectroradiometric instrument. The measurements yielded both visible light and near infrared (NIR) spectra. The NIR data were used to calculate night vision goggle-weighted transmissivity (TNVG) values (Pinkus and Task, 1997). TNVG is a measure of a transparency's compatibility when it is used in conjunction with night vision goggles (NVGs). NVGs utilize the NIR portion (600 nm through 950 nm) of the night sky ambient illumination. Generally speaking, the higher the TNVG coefficient, the higher the NVG visual performance (Pinkus & Task, 1998a; Pinkus & Task, 1997).
Author: United States. Congress. House. Committee on Armed Services. Subcommittee on Investigations
Publisher:
ISBN:
Category : Military helicopters
Languages : en
Pages : 60
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Book Description
Author: Alan R. Pinkus
Publisher:
ISBN: 9781423562764
Category :
Languages : en
Pages : 108
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Book Description
There are several ASTM Standards that address light transmissivity through transparencies (ASTM Standards F 1316-90D and 1003-61) in the visible spectrum (400 through 700 nm). However, night vision goggles (NVGs) are now being used in aircraft and other applications (e.g., marine navigation, surveillance, personnel carriers) with increasing frequency. These devices amplify both visible and near-infrared (NIR) spectral energy. A transparency may have excellent visible transmissive characteristics but could have poor NIR transmissivity. Overall visual performance (acuity) can be degraded if the observer uses the NVGs while looking through a transparency that has attenuated transmissivity in the NIR region (Pinkus and Task, 1997, see Appendix A). ASTM P94-02, Standard Test Method for Measuring Night Vision Goggle-Weighted Transmissivity of Transparent Materials (see draft in Appendix B) addresses this issue.
Author:
Publisher:
ISBN:
Category : Aeronautics, Military
Languages : en
Pages : 102
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Book Description
