Accession Number : ADA189424

Title :   Microwave Landing System Area Navigation (MLS RNAV) Transformation Algorithms and Accuracy Testing,

Corporate Author : FEDERAL AVIATION ADMINISTRATION TECHNICAL CENTER ATLANTIC CITY NJ

Personal Author(s) : Billman, Barry R. ; Remer, James H ; Chang, Min-Ju

Report Date : JUL 1987

Pagination or Media Count : 150

Abstract : Microwave Landing System Area Navigation (MLS RNAV) is a technique which affords the ability to perform precision navigation in the terminal area of a helicopter or airport. It utilizes the signal coverage provided by the MLS angle data transmitters and associated precision distance measuring equipment (DME/P). Navigation performed using an MLS RNAV system is not limited to approaches along a runway centerline or azimuth radial, but may assume any conceivable flightpath within MLS coverage. Examples of these types of approaches would include curves, segmented and oblique offset (parasite), as well as computed centerline (offset) approaches. The work presented herein treats MLS RNAV from a theoretical perspective. MLS RNAV transformation algorithms are developed and tested under real world and laboratory conditions. Anticipated system accuracy is computed under various anticipated operational scenarios. These scenarios include parasite and computed centerline approaches, including the effects of signal source error. The effects on total system accuracy of offsetting the conical elevation transmitter from the runway centerline are presented. The errors associated with computed centerline approaches when the azimuth is offset from the runway centerline is presented.

Descriptors :   *MICROWAVE LANDING SYSTEMS, ACCURACY, ALGORITHMS, ANGLES, CONICAL BODIES, DATA TRANSMISSION SYSTEMS, DISTANCE MEASURING EQUIPMENT, ELEVATION, ERRORS, FLIGHT PATHS, HELICOPTERS, NAVIGATION, PRECISION, RUNWAYS, SCENARIOS, SIGNALS, SOURCES, TERMINAL FLIGHT FACILITIES, TEST AND EVALUATION, TRANSFORMATIONS(MATHEMATICS), TRANSMITTERS, COMPUTER PROGRAMS, FORTRAN.

Subject Categories : Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE