Blar i NTNU Open på forfatter "Gryte, Kristoffer"
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Mapping of Zostera habitat in the Sublittoral Zone using Underwater Hyperspectral Imaging and Unmanned Surface Vehicle
Søreng, Marte Opsahl (Master thesis, 2022)Sjøgressenger over hele verden trues av menneskeskapte habitatødeleggelser og global oppvarming. Det er et behov for kartlegging med høy oppløsning for å øke overvåkningsevnene våre og fylle kunnskapshull knyttet til disse ... -
Model-Based In-Flight Icing Detection for Fixed-Wing UAVs
Tronstad, Phillip Larsen (Master thesis, 2023)Det kommersielle markedet har vært vitne til en bemerkelsesverdig økning i forekomsten av ubemannede fly (UAV-er) i nyere tid. Denne raske veksten har ført til økende bekymring rundt sikker bruk av UAV-er. Blant de ... -
Modeling of the Skywalker X8 Fixed-Wing UAV: Flight Tests and System Identification
Reinhardt, Dirk Peter; Gryte, Kristoffer; Johansen, Tor Arne (Peer reviewed; Journal article, 2022)This paper proposes a combination of wind-tunnel tests and flight experiments to find an aerodynamic model of the Skywalker X8 airframe. The static coefficients resulting from wind-tunnel tests are augmented with a ... -
Modelling and Safety-based Path Planning of Fixed-Wing Unmanned Aerial Vehicle in Icing Conditions
Skogan, Eirik Ishol (Master thesis, 2023)Etter hvert som ubemannede luftfartøyer (UAV) fortsetter å øke i popularitet, utvides bruksområdet deres. Utfordringer knyttet til operasjoner under harde vær- forhold, spesielt ising, dukker opp sammen med nye bruksområder ... -
Optimal Bluetooth Navigation Sensor Placement
Schnell, Andrea (Master thesis, 2023)I løpet av de siste årene har det vært en utvikling innen teknologi som har forårsaket et behov for økende evne til å navigere i ulike miljøer. De velkjente og velbrukte Global Navigation Satellite Systems (GNSS) gir ... -
Outdoor Navigation Using Bluetooth Angle-of-Arrival Measurements
Sollie, Martin Lysvand; Gryte, Kristoffer; Bryne, Torleiv Håland; Johansen, Tor Arne (Journal article; Peer reviewed, 2022) -
Phased Array Radio Navigation System on UAVs: GNSS-based Calibration in the Field
Okuhara, Mika; Bryne, Torleiv Håland; Gryte, Kristoffer; Johansen, Tor Arne (Peer reviewed; Journal article, 2021)With global coverage, high accuracy, and lightweight receivers, global navigation satellite system (GNSS) has been the major positioning solution for unmanned aerial vehicles (UAV). However, GNSS is prone to electromagnetic ... -
Phased Array Radio Navigation System on UAVs: In-flight Calibration
Okuhara, Mika; Bryne, Torleiv Håland; Gryte, Kristoffer; Johansen, Tor Arne (Peer reviewed; Journal article, 2022)Global Navigation Satellite Systems (GNSS) has been the primary positioning solution for Unmanned Aerial Vehicles (UAVs) due to their worldwide coverage, high precision and lightweight receivers. However, GNSS is prone to ... -
Phased Array Radio Navigation System on UAVs: Real-Time Implementation of In-flight Calibration
Okuhara, Mika; Bryne, Torleiv Håland; Gryte, Kristoffer; Johansen, Tor Arne (Peer reviewed; Journal article, 2023)Unmanned aerial vehicles (UAV) require an alternative positioning system to the global navigation satellite systems (GNSS) for safety-critical operations since GNSS is prone to unintentional or malicious electromagnetic ... -
Phased-based Ranging for Navigation
Loftesnes, Hanne Karine (Master thesis, 2023)Det Globale Satelittnavigasjonsssystemet (GSNS) er sårbart for både bevisst og utilsiktet forstyrrelse på grunn av den svake signalstyrken. I kritiske scenarier blir det derfor nødvendig med en alternativ måte å finne ... -
Position Control and Locking of Permanent Magnet Synchronous Motor for Propeller Drives in Drones
Jenssen, Emil (Master thesis, 2022)De siste årene har etterspørselen etter posisjoneringsløsninger for propelldrift i droner økt i industrien, med to velkjente motorapplikasjoner, fremdriftsmotorer og vertikal take-off og landings motorer. Hensikten med ... -
Position Locking for Permanent Magnet Synchronous Machine Propeller Drives in Drones by Hall-Effect Sensor-Assisted Nonlinear Observer
Jenssen, Emil; Gryte, Kristoffer; Suul, Jon Are Wold (Chapter, 2022)The paper presents a hall-effect sensor-assisted non-linear observer-based solution for position locking of a surface-mounted permanent magnet synchronous motor (SMPMSM) propeller drive in drone applications. The purpose ... -
Precision control of fixed-wing UAV and robust navigation in GNSSdenied environments
Gryte, Kristoffer (Doctoral theses at NTNU;2020:198, Doctoral thesis, 2020)Unmanned aerial vehicles (UAVs) have been adopted to a wide range of applications, but fully autonomous flight is still utopian, especially for safety-critical applications. This thesis seeks to close this gap by mainly ... -
Propulsion System Modeling for Small Fixed Wing UAVs
Coates, Erlend Magnus Lervik; Wenz, Andreas Wolfgang; Gryte, Kristoffer; Johansen, Tor Arne (Chapter, 2019)This paper presents a model of an electrical propulsion system typically used for small fixed wing unmanned aerial vehicles (UAVs). Such systems consist of a power source, an electronic speed controller and a brushless DC ... -
Reducing Ground Reflection Multipath Errors for Bluetooth Angle-of-Arrival Estimation by Combining Independent Antenna Arrays
Sollie, Martin Lysvand; Bryne, Torleiv Håland; Gryte, Kristoffer; Johansen, Tor Arne (Peer reviewed; Journal article, 2023)For outdoor navigation using Bluetooth direction finding, elevation angle estimate errors due to ground reflection multipath interference is a significant challenge at low elevation angles. One of the ways to reduce this ... -
Robust and Gain Scheduled Flight Control of Fixed-wing UAVs in Wind and Icing Conditions
Kleiven, Ruben (Master thesis, 2021)Inspirert av de stadig voksende bruksområdene for droner, fokuserer denne oppgaven på robust og "gain scheduled" regulering av fastvingedroner i vind- og isforhold. Hovedmålet for dette arbeidet er å generere et sett med ... -
Robust and Gain Scheduled Flight Control of Fixed-Wing UAVs in Wind and Icing Conditions
Kleiven, Ruben; Gryte, Kristoffer; Johansen, Tor Arne (Journal article; Peer reviewed, 2022) -
Robust Navigation of UAV using Inertial Sensors Aided by UWB and RTK GPS
Gryte, Kristoffer; Hansen, Jakob Mahler; Johansen, Tor Arne; Fossen, Thor I. (Chapter, 2017)Tight integration of ultra wideband (UWB) range measurements with real-time kinematic (RTK) aiding of inertial navigation for increased robustness to GNSS dropouts, is achieved using a double-differenced nonlinear observer. ... -
Single target tracking for Phased Array Radio Navigation
Gillund, Eirik Eikeseth (Master thesis, 2022)Mange ubemannede luftfartøy(UAV) benytter seg av posisjonsmålinger fra et globalt satellittnavigasjonssystem(GNSS) i sine egne navigasjonssystemer. Likevel er GNSS vist å være sårbart for både miljøforstyrrelser og potensielle ... -
A Symmetry Calibration Procedure for Sensor-to-Airframe Misalignments in Wind Tunnel Data
Reinhardt, Dirk Peter; Pedersen, Morten Dinhoff; Gryte, Kristoffer; Johansen, Tor Arne (Chapter, 2022)We propose a calibration method that transforms data from wind tunnel experiments into a coordinate frame where asymmetries with respect to the symmetry plane of most fixed-wing aircraft are minimized in a least-squares ...