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Development and Implementation of an Image-Processing-Based Horizon Sensor for Sounding Rockets

Barf, Jochen (2017) Development and Implementation of an Image-Processing-Based Horizon Sensor for Sounding Rockets. Master's, Julius-Maximilians-Universität Würzburg, Luleå Tekniska Universitet.

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Official URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65553

Abstract

In this thesis a new flexible and robust horizon sensor software for sounding rockets is presented. It operates on image data in the visible spectrum of light and provides two axis attitude information. After a short analysis of the current available technology, the novel algorithm is explained in detail and the new mathematical concept is thoroughly defined. It features a very specialised and optimized edge detection, outlier detection, fisheye distortion compensation and a plausibility check. Moreover, it can cope with strong disturbances introduced by the Sun and inhomogeneities of the reflectance of the Earth while maintaining a linear runtime in the number of pixels. No a priori knowledge apart from the altitude is required by the algorithm. With simulations using Google Earth Pro, the major influential factors to the accuracy and their impact are determined. The software in C++ was implemented for the DSP Blackfin 561 and the RODOS realtime kernel. A tool that simulates an ethernet camera was developed in order to validate the functionality of the software on the DSP. To determine the intrinsic parameters of an optical system, a program that analyses images of chessboard patterns was implemented using OpenCV. The evaluation determined an accuracy better than 1° in the simulation with a sample time between 0:2s and 1s, depending on the set of parameters. The minimum altitude of 25km and the rate of false positive detections of 5% were determined with real footage of a sounding rocket flight from GoPro cameras.

Item URL in elib:https://elib.dlr.de/115725/
Document Type:Thesis (Master's)
Title:Development and Implementation of an Image-Processing-Based Horizon Sensor for Sounding Rockets
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Barf, Jochenjochen.barf (at) dlr.deUNSPECIFIED
Date:2017
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:130
Status:Published
Keywords:Horizon Sensor, Attitude Determination, Sounding Rocket, Camera, Visible Spectrum, Robust Algorithm, Embedded System
Institution:Julius-Maximilians-Universität Würzburg, Luleå Tekniska Universitet
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > Space Flight Technology
Deposited By: Braun, Dr. Benjamin
Deposited On:22 Nov 2017 16:05
Last Modified:31 Jul 2019 20:13

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