A major problem in obtaining FAA approval for infrared EVS-based operations under poor-visibility conditions is the lack of correlation between runway visible range and IR attenuation or range. The "IR advantage" in fog, although often substantial, varies greatly as a function of detailed droplet-size distribution. Real-time knowledge of the IR extinction at a given destination is key to reliable operations with lower decision heights. We propose the concept of a Runway Infrared Range (RIRR), to be measured by a ground-based IR transmissometer. Although RVR determination now utilizes single-point scatterometry, the very (Mie) scattering mechanism that often affords a significant IR range advantage necessitates a return to two-point transmissometry. As an adaptation of RVR technology, RIRR will include separate determinations of background-scene and runway/approach lights ranges, respectively. The latter algorithm, known as Allard's Law, will encompass background level, light-settings, visible extinction, and camera performance (usually at short-wave IR). The assumptions and validity of this RIRR parallel those for the traditional RVR. Also, through extended monitoring at a hub, the RIRR may be inexpensively surveyed throughout a fog season, thus predicting the economic benefits of IR-based EVS for that site.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Runway infrared range concept for EVS


    Contributors:

    Conference:

    Enhanced and Synthetic Vision 2008 ; 2008 ; Orlando,Florida,United States


    Published in:

    Publication date :

    2008-04-15





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Runway infrared range concept for EVS [6957-01]

    Kerr, J.R. / Society of Photo-optical Instrumentation Engineers | British Library Conference Proceedings | 2008


    Super Close Runway Operations (SupeRO): A New Concept to Increase Runway Capacity

    Knabe, Franz / Dreyzehner, Tim / Korn, Bernd | IEEE | 2022


    Examining runway visual range system

    Engineering Index Backfile | 1953