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10 June 1994 Presentation of IR pictures on helmet-mounted displays
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Abstract
The head tracking systems for helmet mounted displays (HMD) have actually achieved a high degree of accuracy, thus allowing the precise control of the line of sight (LOS) of electrooptical vision sensors. Therefore, the possibility to fly day and night having on the helmet visors the pictures generated by a steerable infrared (IR) sensor slaved to the pilot's head becomes nowadays realistic. The paper describes the results of a technical analysis performed on a system based on a steerable IR sensor integrated with an advanced HMD for navigation aid purpose in a modern fighter. Integration aspects and human engineering factors are also widely analyzed. This paper considers the parameters which lead to an imperfect static or dynamic overlay of the generated IR picture with the external world, as seen by the pilot through the helmet visors, and the effects of such misalignment. The finite angular excursion of the IR sensor LOS, due to the gimbals limits, has been taken into account, and the necessary transitions to and from the LLTVs integrated within the helmet, suitable to cover all possible head motions, have been investigated. An approach for the fusion of information generated by the LLTVs and the IR sensor is also reported. The limits and constraints of navigation using steerable IR sensors are also highlighted with respect to safety aspects.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Giorgio Balzarotti, Lorenzo Fiori, and Roberto Malfagia "Presentation of IR pictures on helmet-mounted displays", Proc. SPIE 2218, Helmet- and Head-Mounted Displays and Symbology Design Requirements, (10 June 1994); https://doi.org/10.1117/12.177385
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