Accession Number : AD0783632

Title :   Slant Visual Range (SVR)/Approach Light Contact Height (ALCH) Management System: Evaluation in Fog.

Descriptive Note : Final rept. on Phase 2.


Report Date : JUL 1974

Pagination or Media Count : 134

Abstract : Systems with potential for predicting SVR/ALCH were tested at the National Aviation Facilities Experimental Center (NAFEC), Federal Aviation Administration, Department of Transportation, Atlantic City, New Jersey. These systems' estimation of the slant path transmittance were compared to data being generated by NBS transmissometers located at several levels on nearby 160-foot towers. The transmittance values predicted by the systems being evaluated were used to compute RVR and SVR data. The results of these computations were compared to the actual RVR-SVR calculated based upon NBS transmissometer measurement. The report contains data on the stratification of the fogs observed at NAFEC during the test duration. Pilot eye response is considered with emphasis on techniques of determining the pilot's adaptational level. The pilot's adaptation level calculation is combined with (1) the extinction rate measurements, (2) pilot's eye response and (3) the geometry of the scenario in order to form ALCH and SVR algorithms. (Author)

Descriptors :   *Air traffic control systems, *Slant range, Visibility, Fog, Meteorological instruments, Measurement

Subject Categories : Meteorology
      Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE