Helmet Mounted Displays And Sights

Here's an in-depth, design practitioner's study of helmet-mounted display and sight technology (HMD/HMS). This unique combination of advanced optics, computing, and electronics gives users a continuous, hands-free display of computer, 3-D, or virtual imaging. Authored by a leading aerospace engineer, Helmet-Mounted Displays and Sights takes a comprehensive look at this increasingly popular technology -- from the human factors associated with the use of HMDs, to design requirements of HMD/HMS, to new and future advances in image source and display technology, and more.

The incorporation of technology into aviation has been exponential. Advancements in microelectronics, stealth technology, engine design, and electronic sensors and displays have converted simple aircraft into formidable flying machines. In this book, recognised experts in aviation helmet-mounted displays (HMDs) summarise 25 years of knowledge and experience in the area of HMD visual, acoustic, and biodynamic performance, and user interface issues such as sizing, fitting, and emergency egress.

The helmet-mounted display (HMD) presents flight, sensor, and weapon information in the pilot's line of sight. The HMD was developed to allow the pilot to retain aircraft and weapon information and to view sensor images while looking off boresight. Newman, Richard L. Ames Research Center HELMET MOUNTED DISPLAYS; LINE OF SIGHT; DISPLAY DEVICES; BORESIGHTS; STABILIZATION; MILITARY AVIATION...

Helmet Mounted Displays (HMDs) present flight, navigation, and weapon information in the pilot's line of sight. The HMD was developed to allow the pilot to retain aircraft and weapon information while looking off boresight. This document reviews current state of the art in HMDs and presents a design guide for the HMD engineer in identifying several critical HMD issues: symbol stabilization, inadequate definitions, undefined symbol drive laws, helmet considerations, and Field Of View (FOV) vs. resolution tradeoff requirements. In particular, display latency is a key issue for HMDs. In addition to requiring further experimental studies, it impacts the definition and control law issues. Symbol stabilization is also critical. In the case of the Apache helicopter, the lack of compensation for pilot head motion creates excessive workload during hovering and Nap Of the Earth (NOE) flight. This translates into excessive training requirements. There is no agreed upon set of definitions or descriptions for how HMD symbols are driven to compensate for pilot head motion. A set of definitions is proposed to address this. There are several specific areas where simulation and flight experiments are needed: development of hover and NOE symbologies which compensate for pilot head movement; display latency and sampling, and the tradeoff between FOV, sensor resolution and symbology. Newman, Richard L. and Greeley, Kevin W. Ames Research Center AD-A331767, NASA/CR-97-206824, NAS 1.26:206824, TR-97-11 NAS2-14131...

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