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Preventing Dynamic Rollover in Brownout

Gatter, Alexander (2019) Preventing Dynamic Rollover in Brownout. In: 45th European Rotorcraft Forum 2019, ERF 2019. 45th Conference on European Rotorcraft Forum, 17.-20. Sep. 2019, Warschau, Polen.

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The Institute of Flight Systems at the DLR (German Aerospace Center) site in Braunschweig, Germany is trying to find ways to improve the safety of helicopter operations. One very dangerous type of operation that is the landing of a helicopter. Loss of situational awareness can lead to unwanted contact with objects or a dynamic rollover when touching the ground. This paper presents research with optical navigation methods that has been conducted towards minimizing the danger of a dynamic rollover in bad visual conditions. Optical navigation is a method that is often used for navigating small unmanned aircraft. However, the so far conducted research in that field usually focuses on undegraded visual environment. Most of the optical navigation methods are designed to work with images that can fully be evaluated. In this paper, a set of existing optical navigation methods is tested towards the ability to work in degraded visual environment. Further, a self-developed method is presented that has been designed to be abe to work in scenarios where most parts of an image cannot be evaluated. The methods are tested on recorded flight test data. These flight test data are modified with a set of masks that simulate a visibility impairment. The conducted tests show that existing optical navigation methods do struggle when the complete image area cannot be evaluated. The evaluation of the self-developed method shows that it is not affected by impaired sight. However, its performance in situations with non-restricted sight shows to be behind the performance of some of the existing methods.

Item URL in elib:https://elib.dlr.de/129271/
Document Type:Conference or Workshop Item (Speech)
Title:Preventing Dynamic Rollover in Brownout
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gatter, Alexanderalexander.gatter (at) dlr.dehttps://orcid.org/0000-0002-6228-7890
Date:September 2019
Journal or Publication Title:45th European Rotorcraft Forum 2019, ERF 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Dynamic Rollover, Brownout, DVE, Optical Navigation, Image Processing
Event Title:45th Conference on European Rotorcraft Forum
Event Location:Warschau, Polen
Event Type:international Conference
Event Dates:17.-20. Sep. 2019
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 - Human factors and safety in Aeronautics (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Gatter, Alexander
Deposited On:10 Jan 2020 17:55
Last Modified:10 Jan 2020 17:55

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