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Experimental Advanced RNP to xLS Approaches with Vertical Path Coding and Automatic Landings

Dautermann, Thomas and Geister, Robert Manuel and Ludwig, Thomas and Blase, Tobias (2018) Experimental Advanced RNP to xLS Approaches with Vertical Path Coding and Automatic Landings. The Aeronautical Journal. Cambridge University Press. DOI: 10.1017/aer.2018.87 ISSN 0001-9240

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Official URL: https://www.cambridge.org/core/journals/aeronautical-journal

Abstract

We report on the flight test results of an Airbus 320 during novel advanced required navigation performance (RNP) procedures which contain a fixed radius turn (RF) that delivers the aircraft onto a short instrument landing system (ILS) precision final. Moreover the advanced RNP part contains altitude constraints and/or a coded vertical path angle. The approaches were flown automatically with guidance and autothrust as computed by the flight management system. We investigated the use of the fixed radius in conjunction with vertical path options onto (a) the performance of the speed profile for arrival time optimization (b) the vertical path during the RNP part of the procedure and (c) the performance of the autoland capability after a curved transition onto an ILS. For the trials, we designed five instrument approaches to a runway equipped with ILS. A RF curve terminates at the ILS intercept point at heights of 550ft, 750ft, 1000ft, 1500ft and 2000ft above aerodrome level and each approach had four different initial approach fixes which corresponded to a track angle change of 30,60,90 and 180 degrees during the constant radius turn-to-final. We constructed the procedure such that the altitude constraints at initial, intermediate and final approach fix describe a continuous vertical path with minus two degrees inclination, transitioning to the minus three degree glide path of the ILS and intercepting the glide path from below. In all cases, the land mode of the flight guidance computer became active between 316 and 381ft radar altitude. The vertical path following error depended on the coding of the procedure in the database. With coded vertical path angle and altitude constraints, the vertical path following error was never greater than +57 meters (above desired flight path) during the RNP part when flown by the automatic flight guidance system without any pilot intervention.

Item URL in elib:https://elib.dlr.de/105112/
Document Type:Article
Title:Experimental Advanced RNP to xLS Approaches with Vertical Path Coding and Automatic Landings
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dautermann, ThomasThomas.Dautermann (at) dlr.dehttps://orcid.org/0000-0001-9469-5613
Geister, Robert Manuelrobert.geister (at) dlr.dehttps://orcid.org/0000-0003-0433-1635
Ludwig, ThomasThomas.Ludwig (at) dlr.dehttps://orcid.org/0000-0003-3882-8359
Blase, TobiasTobias.Blase (at) dlr.deUNSPECIFIED
Date:2018
Journal or Publication Title:The Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1017/aer.2018.87
Publisher:Cambridge University Press
ISSN:0001-9240
Status:Published
Keywords:RNP, ILS, A320, ATRA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Efficient Flight Guidance
Location: Braunschweig
Institutes and Institutions:Institute of Flight Control > Pilot Assistance
Deposited By: Dautermann, Dr. Thomas
Deposited On:09 Nov 2016 17:35
Last Modified:25 Sep 2018 14:33

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