Enrico Stoll

Enrico Stoll
Technische Universität Braunschweig · Institute of Space Systems

Prof. Dr.-Ing., B.Sc.

About

129
Publications
28,751
Reads
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784
Citations
Additional affiliations
October 2014 - present
Technische Universität Braunschweig
Position
  • Head of Institute
January 2012 - December 2013
Freie Universität Berlin
Position
  • Guest Researcher and Lecturer
July 2011 - August 2011
Universiti Putra Malaysia
Position
  • Guest Reseracher
Education
October 2005 - September 2011
FernUniversität in Hagen & Technische Universität München
Field of study
  • Mathematics
February 2005 - December 2008
Technische Universität München
Field of study
  • Aerospace engineering
October 1999 - November 2004
Technische Universität Dresden
Field of study
  • Aerospace Engineering

Publications

Publications (129)
Article
Initial experiments in the design process of a novel 3D printed conformal propellant tank for small satellites are conducted. Contact angle measurements of static colored water droplets on printed PLA, PMMA, and PETG sample plates are performed. Additionally, the optical characteristics of transparent printed tanks of two to five millimeter wall th...
Article
Characterisation of space debris has become a fundamental task to facilitate sustainable space operations. Ground-based surveillance provides the means to extract key attributes from spacecraft. However, signal inversion attempts are generally under-constrained, which is why an increase in measurement channels through multispectral observations is...
Article
While the quantity of space debris objects is steadily increasing, the necessity for space- or ground-based systems observing and cataloguing these objects grows as well. In principle, observations can be made by radar or optically by telescopes. Optical observations have various advantages over radar, such as low purchase and operating costs combi...
Conference Paper
Full-text available
Robotic systems become more and more important for space applications due to the flexibility in tasks they can perform such as docking assistance, supporting extra-vehicular activities (EVA), as well as maintenance tasks. For these purposes multiple different robotic arms have been developed, especially for missions which are intended to demonstrat...
Conference Paper
Large scale, on-orbit additive manufacturing (AM) and assembly is being considered as a modular and resource saving approach to facilitate permanent human presence in space. To realise this, a novel AM approach to freeform fabricate large, functional structures in space has been developed. Combining the reach of a free-flying CubeSat with a collabo...
Article
Full-text available
The current paradigm in space robotics is the design of specialized robotic manipulators to meet the requirements for a specific mission profile. This research aims to develop a novel concept of a modular robotic arm for multi-purpose and multi-mission use. The overall approach is based on a manipulator formed by serial connection of identical modu...
Conference Paper
The growing demand for cheaper space access calls for a more economically and environmentally sustainable approach for launchers. Concurrently, the shift to smaller satellites and the rise of constellations necessitate launchers capable of precise multi-payload/multi-orbit injection. ASCenSIon (Advancing Space Access Capabilities-Reusability and Mu...
Conference Paper
Reusable Launch Vehicles (RLVs) are not only key for an economically and ecologically sustainable space access but also represent a paramount innovation towards the increasing demand for smaller satellites and mega-constellations. In order to ensure Europe's independent space access capabilities, ASCenSIon (Advancing Space Access Capabilities - Reu...
Conference Paper
Reusable Launch Vehicles (RLVs) are not only key for an economically and ecologically sustainable space access but also represent a paramount innovation towards the increasing demand for smaller satellites and mega- constellations. In order to ensure Europe's independent space access capabilities, ASCenSIon (Advancing Space Access Capabilities - Re...
Article
Full-text available
The feasibility of 3D-printed molds for complex solid fuel block geometries of hybrid rocket engines is investigated. Additively produced molds offer more degrees of freedom in designing an optimized but easy to manufacture mold. The solid fuel used for this demonstration was hydroxyl-terminated polybutadiene (HTPB). Polyvinyl alcohol (PVA) was cho...
Article
In this paper, investigations of two types of lunar regolith simulants, called TUBS-M and TUBST, developed by the Institute of Space Systems (IRAS) at TU Braunschweig are presented. These investigations are focused on the thermal properties, namely the specific heat capacity and the thermal conductivity. Several specimen of TUBS-M and TUBS-T were s...
Article
Full-text available
Unmanned aerial vehicles (UAVs) have been used for increasing research applications in atmospheric measurements. However, most current solutions for these applications are based on a single UAV with limited payload capacity. In order to address the limitations of the single UAV-based approach, this paper proposes a new concept of measurements using...
Article
Full-text available
Mankind is setting to colonize space, for which the manufacturing of habitats, tools, spare parts and other infrastructure is required. Commercial manufacturing processes are already well engineered under standard conditions on Earth, which means under Earth’s gravity and atmosphere. Based on the literature review, additive manufacturing under luna...
Conference Paper
In view of the upcoming mega-constellations, Collision Avoidance Manoeuvres (CAM) become essential to protect both the space environment and the mission of the constellation. However, satellite constellations are usually bound to tight geometrical constraints, which can be disturbed by these manoeuvres. A communications Walker Delta constellation w...
Conference Paper
Orbit Determination is a crucial part of Space Situational Awareness, especially, in the wake of upcoming mega constellations and the general trend towards an increased rate of orbital injection. While there are several initial and statistical orbit determination algorithms, one key aspect is the precise modeling of the process noise to accurately...
Preprint
Patch antennas are compact, less complex, planar structures and therefore, widely used in small satellite missions for telecommand, data link, and intersatellite link, particularly in S- band and X- band. Improved performance of these patch antennas in terms of gain and compactness will di-rectly affect the communication efficiency of small satelli...
Article
ESA, NASA, and other space institutions are planning the return to the Moon. In the next decades, a human outpost on the lunar surface is going to be established to extend the opportunities for science and economy. For this project, new materials, methods, and processes based on In-Situ Resource Utilization (ISRU) are needed. One aspect is the cast...
Preprint
Full-text available
The derivation, implementation, and performance assessment of a differential drag based algorithm, designed for spacecraft formation control using a relative orbital elements formulation, is presented. In contrast to similar approaches found in literature, the underlying motion dynamics model used to derive the control law includes J2 perturbation...
Article
Material processing and material transport systems on Earth are designed for Earth's gravity and atmosphere. In order to pave the way for the future colonization of space, production technologies and transport systems are an essential factor in reducing costs and logistical efforts, such as in-situ resource utilization (ISRU). Laser-based additive...
Article
Full-text available
In this Note, we present a potential field-based sliding surface design principle for spacecraft attitude maneuvers. Based on the proposed design principle, we obtain new results of sliding surfaces using different attitude parameterizations. These new results are shown to be general forms of existing classical sliding surfaces in literature. Furth...
Article
The use of lunar hybrid rockets, that connect the Moon surface with a lunar gateway and provide it with resources, are evaluated. Therefore, the composition of lunar regolith and its use for specific rocket subsystems is assessed. In particular, this work evaluates the use of oxygen and aluminum from regolith as oxidant/fuel mixture as well as the...
Conference Paper
Full-text available
The trend towards smaller satellites and mega-constellations has enormously changed the space sector and its uti-lisation in the last decades, allowing new players to enter the market and to introduce stringent requirements to enable a variety of novel applications. Alongside, also the launcher market is undergoing a transformation epoch: the devel...
Article
Full-text available
Recent developments have seen a trend towards larger constellations of spacecraft, with some proposals featuring constellations of more than 10.000 satellites. While similar concepts for large constellations already existed in the past, traditional satellite deployments hardly ever feature groups of more than 100 satellites. This trend towards cons...
Article
Full-text available
This is the first of two companion papers that investigate the operations of distributed satellite systems. This first article presents a survey of conventional methods of operations of spacecraft constellations, investigates its scalability for growing number of spacecraft, and identifies operational paradigms shift. The second article focuses on...
Article
Full-text available
The development of hybrid rockets offers excellent opportunities for the practical education of students at universities due to the high safety and relatively low complexity of the rocket propulsion system. During the German educational program Studentische Experimental-Raketen (STERN), students of the Technische Universität Braunschweig obtain the...
Conference Paper
Full-text available
The ReDSHIFT (Revolutionary Design of Spacecraft through Holistic Integration of Future Technologies) project was concluded on March 31, 2019. The 3-year project involved 13 European partners and was aimed at studying, implementing and testing novel solutions for space debris mitigation. The focus was on passive means to reduce the impact of Space...
Conference Paper
Full-text available
The space industry is undergoing fundamental shifts in paradigms: From few, large satellite buses to many small satellites; from one ground station to many ground stations, from manual telemetry review to an automated treatment; from long in-orbit lifetimes to shorter periods. At the same time, the announcement of large constellations with several...
Article
One of the common challenges of spaceflight and e-mobility is the energy storage. The operational ranges of spacecraft or electric cars as well as operational usability is strongly dependent on the capacity of the energy storage, which is usually constrained by the mass and volume of the vehicle. For example, the battery mass of large communication...
Article
Rising international interest in scientific and commercial Moon exploration programs require cost-efficient logistical solutions regarding raw- and construction materials for a permanent residence on our Earth’s satellite. Lunar regolith soil is the most abundant resource; its technical exploitation would comprise a major leap forward towards the c...
Conference Paper
Full-text available
We consider a central challenge that is mission critical for the successful operation of large-scale satellite constellations in Low-Earth Orbit: How can we coordinate the short-term download operations for the enormous amounts of generated data, based on wireless line-of-sight connections to a limited number of stationary ground station? These iss...
Article
Full-text available
There has been a long discussion on how the low-gravity effects that LRUs (Lightweight Rover Units) on the Moon will experience, can affect mission planning and surface operations. In particular, the sinkage observed when regolith soil layers collapse under a normal wheel load has been an important source of contradiction in the field of Terramecha...
Article
Full-text available
This paper proposes an adaptive sliding mode control law based on dual quaternions for six-degree-of-freedom proximity operations between a chaser and a target spacecraft. Dual quaternion, a new parameterization to simultaneously describe the translation and the rotation of a rigid body, is used to model the relative motions during proximity operat...
Conference Paper
Full-text available
This paper presents the derivation, implementation, and performance assessment of a differential drag based algorithm, designed for spacecraft formation control. In contrast to similar approaches found in literature, the underlying motion dynamics model used to derive the control law includes J2 perturbation as well as atmospheric drag perturbation...
Article
The area of spaceflight, especially human space flight, experienced a change in the past decades. Due to the privatization of space flight, many advances were provided and human space flight was pushed forward. The number of spaceflight and spaceports has increased as well as the interest in space tourism. General feasibility studies of space touri...
Article
A method to deduce orbit solutions of predetermined accuracy with respect to a reference orbit is presented. The idea is to guarantee the applicability to all orbits and provide both the orbit and the covariance matrix with a constrained method error. Such a solution may be useful, if different users expect different levels of accuracy or have limi...
Article
Full-text available
3D-PIC (Particle In Cell) simulations were performed to emulate the dynamics and collection of plasma particles onto the surface of the UWE-IV, a satellite of miniaturized dimensions (CubeSat) launched in 2018. We review the electrostatic potential, currents collected and plasma disturbances of the CubeSat and characterize them by numerical simulat...
Article
Full-text available
This paper presents the results of a numerical evaluation of the natural lifetime reduction in low Earth orbit, due to dynamical perturbations. The study considers two values for the area-to-mass ratio, a nominal ratio which resembles a typical value of spacecraft in orbit today, and an enhanced ratio which covers the surface augmentation. The resu...
Article
Full-text available
Gain, noise figure (NF), and output power are considered the common performance metrics of an optical fiber amplifier. With an increasing interest of space industry in developing technologies for satellite-ground and intersatellite communication in the optical band, the EDFA (erbium doped fiber amplifier) is needed as power amplifier in space to co...
Conference Paper
A large number of resident space objects (RSO) is located in Earths vicinity. Today, 19206 RSOs, thereof 2027 are active satellites, are trackable. Nevertheless, the number will increase by thousands of additional satellites as the so-called mega constellations are established. This will lead to an increased risk of collisions with other RSOs. The...
Conference Paper
The ReDSHIFT (Revolutionary Design of Spacecraft through Holistic Integration of Future Technologies) project has been approved by the European Community in the framework of the H2020 Protec 2015 call, focused on passive means to reduce the impact of Space Debris by prevention, mitigation and protection. The main innovative aspects of the project c...
Conference Paper
Full-text available
In order to increase the Technology Readiness Level of technologies and algorithms for space applications, the emulation of the free-floating nature of spacecraft is required. In order to replicate this free-floating behaviour, the Institute of Space Systems of Technische Universität Braunschweig has recently implemented the Experimental Laboratory...
Article
The knowledge of the tensile strength of astrophysical dust and ice aggregates is of major importance to understand the early stages of planet formation in our solar system and cometary activity. In this letter, we report on an experimental setup, developed to measure the tensile strength of granular, astrophysical relevant materials, such as water...
Conference Paper
Full-text available
Time-optimal reorientation maneuver in the presence of complex attitude constraints is important for the spacecraft to quickly respond to missions. However, it is difficult to solve the problem even with direct methods, which results from the fact that a feasible initial guess for direct methods is usually not available. This paper proposes a new m...
Article
Future space exploration will focus on destinations beyond the Earth’s orbit, which necessitates new technologies such as In-Space Resource Utilization. This paper presents a technological approach for the processing of lunar regolith via an adapted laser based Additive Layer Manufacturing method, which needs no binding additives or other supply fr...
Article
We present a new global array of small aperture optical telescopes designed to study artificial satellites and the nearby universe: the Falcon Telescope Network (FTN). Developed by the Center for Space Situational Awareness Research in the Department of Physics at the United States Air Force Academy (USAFA), the FTN is composed of 12 observatories...
Article
Full-text available
The H2020 ReDSHIFT project aims at finding passive means to mitigate the proliferation of space debris. This goal is pursued by a twofold research activity based on theoretical astrodynamics, computer simulations and the analysis of legal aspects of space debris, coupled with an experimental activity on advanced additive manufacturing (3D printing)...
Conference Paper
In this paper, the requirements for a mobile robotic prototype with a manipulator arm and a printing head for additive layer manufacturing of lunar regolith simulant are described. The requirements for the rover, the arm, and the printing head are examined separately. The selection process of the hardware is explained based on the requirements and...
Conference Paper
In this paper, the requirements for a mobile robotic prototype with a manipulator arm and a printing head for additive layer manufacturing of lunar regolith simulant are described. The requirements for the rover, the arm, and the printing head are examined separately. The selection process of the hardware is explained based on the requirements and...
Conference Paper
Full-text available
In this paper, the requirements for a mobile robotic prototype with a manipulator arm and a printing head for additive layer manufacturing of lunar regolith simulant are described. The requirements for the rover, the arm, and the printing head are examined separately. The selection process of the hardware is explained based on the requirements and...
Conference Paper
Current discussions within the international space community show a growing interest in a return to the Moon to enable long-term robotic and manned activities on the surface and in lunar orbit. To allow a cost effective exploration and utilization of the lunar surface, processing of local resources (ISRU) is the key to lower transport needs and cos...
Article
Full-text available
The Institute of Space Systems at Technische Universität Braunschweig has long-term experience in the field of space debris modeling. This article reviews the current state of ongoing research in this area. Extensive activities are currently underway to update the European space debris model MASTER. In addition to updating the historical population...
Article
In order to understand the early formation of planets in the solar system and the activity of comets the tensile strength of astrophysical materials is of major importance. Therefore we currently developed a method to measure the tensile strength of ice and dust aggregates. The measured tensile strength for dust aggregates is depending on the grain...
Article
In: VDI technikforum, Vol. 02/2018, pp 4-7, 2018.
Conference Paper
The goal of the Optical Coatings Ultra Lightweight Robust Spacecraft Structures (OCULUS) project is to develop a high-quality metallization process for surface modification of high precise carbon fiber reinforced plastics (CFRP) structures. As a joint research project between the Institute of Space Systems at Technical University of Braunschweig, I...
Article
Full-text available
This paper derives a control concept for formation flight (FF) applications assuming circular reference orbits. The paper focuses on a general impulsive control concept for FF which is then extended to the more realistic case of non-impulsive thrust maneuvers. The control concept uses a description of the FF in relative orbital elements (ROE) inste...