Excel file with the results of the optimization of the Earth Observation Data (EOD) Processing an... more Excel file with the results of the optimization of the Earth Observation Data (EOD) Processing and Distribution pilot case using the ENTICE middleware. The EOD pilot consists of four virtual machines: process4EO, monitor4EO, archive4EO, user4EO. The metrics used to measure the optimization of each virtual machine are the sizes, creation times, delivery times, deployment time. Finally, the percentaje reductions were calculated.
<em>Processing and distribution of big space data still implies the treatment of massive an... more <em>Processing and distribution of big space data still implies the treatment of massive and large-sized data obtained from Earth Observation satellite recordings. Remote sensing industries implement on-site conventional infrastructures to acquire, store, process and distribute the geo-information generated. However, these solutions present several drawbacks: (i) the cost of acquiring recent Earth images is limiting, (ii) clients have no direct and fast access to needed data as information is processed and distributed spontaneously, and (iii) the service is not flexible, in other words, it does not cover significant changes in the demand of services and the access to the information presents large latencies. Deimos' research focuses on the development of future internet technologies in order to improve Earth Observation (EO) services and reduce the associated costs. In particular, a cloud infrastructure based on OpenNebula is used, and the Deimos-2 PDGS is optimised by using the ENTICE open source middleware. Experimental results of the implemented system are presented.</em>
In this article, a new method to control a flexible robotic arm using a conventional direct curre... more In this article, a new method to control a flexible robotic arm using a conventional direct current (DC) motor with a gear actuator strongly affected by non-linear friction torque is proposed. This control method does not require friction compensation and hence the estimation of this term because the control scheme is robust with respect to this effect. In addition, the only variables to measure are the motor shaft and tip angular positions. Velocity measurements, which always introduce errors and noises, are not required. The use of filters to estimate velocities and bounded derivatives are not needed. The Generalized Proportional Integral GPI controller is designed using a two-stage design procedure entitling an outer loop, designed under the assumption of no motor dynamics, and subsequently an inner loop which forces the motor response to track the control input position reference trajectory derived in the previous design stage. Velocity measurements, which always introduce error...
Earth observation (EO) with satellites has been applied in different fields such as environment m... more Earth observation (EO) with satellites has been applied in different fields such as environment monitoring, natural disasters response, emergencies management, civil security, intelligence, maritime surveillance, and many others. Some of the application fields are very demanding in terms of system revisit time and product delivery time. This is the case of responses to natural disasters. However EO still presents critical challenges to overcome in order to cover the actual demand of services: (i) high revisit time, (ii) high response time, and (iii) easy and instant access to EO products. To increase the revisit time and broaden the applications of the remote sensing, new space concepts such as constellations and formations of satellites have been developed. However, the traditional ground infrastructures, which are required to process and store data, are expensive. Moreover, their limited scalability as well as their limited flexibility to manage large and variable amounts of imagery data shall also be considered. Along this work, we propose a cloud infrastructure for data management to be validated with a constellation of 17 satellites acquiring the Earth’s surface on a daily basis in order to offer high added value services for highly demanding applications. The satellites download the raw data images in a network of 12 ground stations distributed around the world to provide global coverage. The cloud system is based on previous works carried out by the research group. Thus the cloud infrastructure is tested and evaluated for its use in the EO sector and applied to different realistic scenarios, including an intensive comparison with a traditional system responding to the Lorca’s earthquake, which occurred in Spain in 2011.
The aim of this work is to demonstrate the use of additive manufacturing with thermoplastic mater... more The aim of this work is to demonstrate the use of additive manufacturing with thermoplastic material in the whole functional structure of spacecraft and to mechanically qualify it for space flight. For such purpose, an 8 U CubeSat structure was manufactured in polyetherimide (PEI) ULTEM™ through 3D printing and passed several vibration tests. The results are compared with those obtained in the qualification of the same structure manufactured in aluminum alloy AA-6082 T651 through a conventional CNC method. The qualification consisted of passing the vibration requirements in quasi-static, sine, and random tests to fly in PSLV launcher. Finally, a robustness test for the 3D-printed structure is included, and all the results are analyzed. This study is being part of the H2020 European Project ReDSHIFT (Project ID 687500)
The aim of this work is to demonstrate the use of additive manufacturing with thermoplastic mater... more The aim of this work is to demonstrate the use of additive manufacturing with thermoplastic material in the whole functional structure of spacecraft and to mechanically qualify it for space flight. For such purpose, an 8 U CubeSat structure was manufactured in polyetherimide (PEI) ULTEM™ through 3D printing and passed several vibration tests. The results are compared with those obtained in the qualification of the same structure manufactured in aluminum alloy AA-6082 T651 through a conventional CNC method. The qualification consisted of passing the vibration requirements in quasi-static, sine, and random tests to fly in PSLV launcher. Finally, a robustness test for the 3D-printed structure is included, and all the results are analyzed. This study is being part of the H2020 European Project ReDSHIFT (Project ID 687500)
In this paper we describe a procedure for parameters identification using an on-line, non asympto... more In this paper we describe a procedure for parameters identification using an on-line, non asymptotic, algebraic identification method for a continuous time constant linear system. We make a specific application in the determination of the parameters of a DC servo motor model. The method is suitable for simultaneously identifying, both, the viscous friction coefficient and the inertia of the motor. It is found that the proposed method is computationally faster and more robust with respect to system noises than conventional methods. The identification algorithm has been verified by both simulation and experimental results. In addition, the identification of the coulomb's friction coefficient of the servo motor model has been investigated.
Conventional Earth Observation Payload Data Ground Segments (PDGS) continuously receive variable ... more Conventional Earth Observation Payload Data Ground Segments (PDGS) continuously receive variable requests for data processing and distribution. However, their architecture was conceived to be on the premises of satellite operators and, for instance, has intrinsic limitations to offer variable services. In the current chapter, we introduce cloud computing technology to be considered as an alternative to offer variable services. For that purpose, a cloud infrastructure based on OpenNebula and the PDGS used in the Deimos-2 mission was adapted with the objective of optimizing it using the ENTICE open source middleware. Preliminary results with a realistic satellite recording scenario are presented
To extend missions lifetime at very low altitudes, an efficient propulsion system is required to ... more To extend missions lifetime at very low altitudes, an efficient propulsion system is required to compensate for aerodynamic drag. One solution is Atmosphere-Breathing Electric Propulsion (ABEP). It collects atmospheric particles to be used as propellant for an electric thruster. The system ideally nullifies the requirement of onboard propellant storage. An ABEP system can be applied to any celestial body with atmosphere (Mars, Venus, Titan, etc.), enabling new mission at low altitude ranges for longer times. Challenging is operation of the thruster on reactive chemical species, such as atomic oxygen (AO), that is highly present in low Earth orbit, as they cause erosion of (not only) propulsion system components, i.e. acceleration grids, electrodes, neutralizers, and discharge channels of conventional EP systems. For this reason, a contactless plasma thruster is developed: the RF helicon-based plasma thruster (IPT). The paper describes the thruster design, implementation, and first i...
Orbiting at lower orbital altitudes, where the residual atmosphere is source of aerodynamic drag ... more Orbiting at lower orbital altitudes, where the residual atmosphere is source of aerodynamic drag requires an efficient drag-compensation system for satellite lifetime extension. One solution is proposed by using Atmosphere-Breathing Electric Propulsion (ABEP), a system that collects atmospheric particles and directly uses them as propellant for an electric thruster. Challenging is also the presence of reactive chemical species at low altitudes, such as atomic oxygen. This is an erosion source of (not only) the propulsion system components, i.e. acceleration grids, electrodes and discharge channels of conventional EP systems such as Radio frequency ion thrusters (RIT) and Hall-effect thrusters (HET). The thruster for an ABEP is proposed to be an Inductive Plasma Thruster (IPT) based on an electrodeless design. Hereby the first step is an efficient plasma source working on atmospheric propellant. Starting from IPG6-S as test-bed, a small scale inductively heated plasma generator at IR...
The treatment of massive and large-sized data obtained from Earth Observation satellite recording... more The treatment of massive and large-sized data obtained from Earth Observation satellite recordings still presents a critical challenge. Remote sensing industries implement on-site conventional infrastructures to acquire, store, process and distribute the geo-information generated. However these solutions are not flexible neither easily scalable. The presented research focuses in the development of future internet technologies in order to improve Earth Observation (EO) services and to highly reduce the costs associated with on premises deployment. On the one hand, the EOD pilot case consists of the deployment in cloud of the gs4EO software, commercialized by Deimos. EOD pilot proposes several scenarios, all of them built with 4EO products: archive4EO collects data from different sources and triggers the processing of the raw data using process4EO; monitor4EO monitors all the process, and the resulting data is accessible using user4EO services (http://www.entice-project.eu/eodusecase)...
D. González, V. Cañas, J. Becedas, R. M. Domínguez, P. C. E. Roberts, N. H. Crisp, V. T. A. Oiko,... more D. González, V. Cañas, J. Becedas, R. M. Domínguez, P. C. E. Roberts, N. H. Crisp, V. T. A. Oiko, S. Edmondson, S. D. Worrall, S. Haigh, K. Smith, R. E. Lyons, S. Livadiotti, C. Huyton, L. A. Sinpetru, A. Striker, S. Rodriguez-Donaire, D. Garcia-Almiñana, M. Sureda, D. Kataria, G. H. Herdrich, F. Romano, Y. Chan, A. Boxberger, S. Fasoulas, C. Traub, R. Outlaw, V. Hanessian, A. Mølgaard , J. Nielsen, M. Bisgaard, R. Villain, J. S. Perez, A. Conte, B. Belkouchi, A. Schwalber, B. Heißerer
D. González, V. Cañas, J. Becedas, R. M. Domínguez, P. C. E. Roberts, N. H. Crisp, V. T. A. Oiko,... more D. González, V. Cañas, J. Becedas, R. M. Domínguez, P. C. E. Roberts, N. H. Crisp, V. T. A. Oiko, S. Edmondson, S. D. Worrall, S. Haigh, K. Smith, R. E. Lyons, S. Livadiotti, C. Huyton, L. A. Sinpetru, A. Striker, S. Rodriguez-Donaire, D. Garcia-Almiñana, M. Sureda, D. Kataria, G. H. Herdrich, F. Romano, Y. Chan, A. Boxberger, S. Fasoulas, C. Traub, R. Outlaw, V. Hanessian, A. Mølgaard , J. Nielsen, M. Bisgaard, R. Villain, J. S. Perez, A. Conte, B. Belkouchi, A. Schwalber, B. Heißerer
Challenging space mission scenarios include those in very low Earth orbits, where the atmosphere ... more Challenging space mission scenarios include those in very low Earth orbits, where the atmosphere creates significant drag to the S/C and forces their orbit to an early decay. For drag compensation, propulsion systems are needed, requiring propellant to be carried on-board. An atmosphere-breathing electric propulsion system (ABEP) ingests the residual atmosphere through an intake and uses it as propellant for an electric thruster. Theoretically applicable to any planet with atmosphere, the system might allow drag compensation for an unlimited time without carrying propellant. A new range of altitudes for continuous operation would become accessible, enabling new scientific missions while reducing the required effort for the launcher by achieving these low orbits. Preliminary studies have shown that the collectible propellant flow for an ion thruster in low Earth orbit (LEO) might not be enough, and that electrode erosion due to aggressive gases, such as atomic oxygen, will limit the ...
Excel file with the results of the optimization of the Earth Observation Data (EOD) Processing an... more Excel file with the results of the optimization of the Earth Observation Data (EOD) Processing and Distribution pilot case using the ENTICE middleware. The EOD pilot consists of four virtual machines: process4EO, monitor4EO, archive4EO, user4EO. The metrics used to measure the optimization of each virtual machine are the sizes, creation times, delivery times, deployment time. Finally, the percentaje reductions were calculated.
<em>Processing and distribution of big space data still implies the treatment of massive an... more <em>Processing and distribution of big space data still implies the treatment of massive and large-sized data obtained from Earth Observation satellite recordings. Remote sensing industries implement on-site conventional infrastructures to acquire, store, process and distribute the geo-information generated. However, these solutions present several drawbacks: (i) the cost of acquiring recent Earth images is limiting, (ii) clients have no direct and fast access to needed data as information is processed and distributed spontaneously, and (iii) the service is not flexible, in other words, it does not cover significant changes in the demand of services and the access to the information presents large latencies. Deimos' research focuses on the development of future internet technologies in order to improve Earth Observation (EO) services and reduce the associated costs. In particular, a cloud infrastructure based on OpenNebula is used, and the Deimos-2 PDGS is optimised by using the ENTICE open source middleware. Experimental results of the implemented system are presented.</em>
In this article, a new method to control a flexible robotic arm using a conventional direct curre... more In this article, a new method to control a flexible robotic arm using a conventional direct current (DC) motor with a gear actuator strongly affected by non-linear friction torque is proposed. This control method does not require friction compensation and hence the estimation of this term because the control scheme is robust with respect to this effect. In addition, the only variables to measure are the motor shaft and tip angular positions. Velocity measurements, which always introduce errors and noises, are not required. The use of filters to estimate velocities and bounded derivatives are not needed. The Generalized Proportional Integral GPI controller is designed using a two-stage design procedure entitling an outer loop, designed under the assumption of no motor dynamics, and subsequently an inner loop which forces the motor response to track the control input position reference trajectory derived in the previous design stage. Velocity measurements, which always introduce error...
Earth observation (EO) with satellites has been applied in different fields such as environment m... more Earth observation (EO) with satellites has been applied in different fields such as environment monitoring, natural disasters response, emergencies management, civil security, intelligence, maritime surveillance, and many others. Some of the application fields are very demanding in terms of system revisit time and product delivery time. This is the case of responses to natural disasters. However EO still presents critical challenges to overcome in order to cover the actual demand of services: (i) high revisit time, (ii) high response time, and (iii) easy and instant access to EO products. To increase the revisit time and broaden the applications of the remote sensing, new space concepts such as constellations and formations of satellites have been developed. However, the traditional ground infrastructures, which are required to process and store data, are expensive. Moreover, their limited scalability as well as their limited flexibility to manage large and variable amounts of imagery data shall also be considered. Along this work, we propose a cloud infrastructure for data management to be validated with a constellation of 17 satellites acquiring the Earth’s surface on a daily basis in order to offer high added value services for highly demanding applications. The satellites download the raw data images in a network of 12 ground stations distributed around the world to provide global coverage. The cloud system is based on previous works carried out by the research group. Thus the cloud infrastructure is tested and evaluated for its use in the EO sector and applied to different realistic scenarios, including an intensive comparison with a traditional system responding to the Lorca’s earthquake, which occurred in Spain in 2011.
The aim of this work is to demonstrate the use of additive manufacturing with thermoplastic mater... more The aim of this work is to demonstrate the use of additive manufacturing with thermoplastic material in the whole functional structure of spacecraft and to mechanically qualify it for space flight. For such purpose, an 8 U CubeSat structure was manufactured in polyetherimide (PEI) ULTEM™ through 3D printing and passed several vibration tests. The results are compared with those obtained in the qualification of the same structure manufactured in aluminum alloy AA-6082 T651 through a conventional CNC method. The qualification consisted of passing the vibration requirements in quasi-static, sine, and random tests to fly in PSLV launcher. Finally, a robustness test for the 3D-printed structure is included, and all the results are analyzed. This study is being part of the H2020 European Project ReDSHIFT (Project ID 687500)
The aim of this work is to demonstrate the use of additive manufacturing with thermoplastic mater... more The aim of this work is to demonstrate the use of additive manufacturing with thermoplastic material in the whole functional structure of spacecraft and to mechanically qualify it for space flight. For such purpose, an 8 U CubeSat structure was manufactured in polyetherimide (PEI) ULTEM™ through 3D printing and passed several vibration tests. The results are compared with those obtained in the qualification of the same structure manufactured in aluminum alloy AA-6082 T651 through a conventional CNC method. The qualification consisted of passing the vibration requirements in quasi-static, sine, and random tests to fly in PSLV launcher. Finally, a robustness test for the 3D-printed structure is included, and all the results are analyzed. This study is being part of the H2020 European Project ReDSHIFT (Project ID 687500)
In this paper we describe a procedure for parameters identification using an on-line, non asympto... more In this paper we describe a procedure for parameters identification using an on-line, non asymptotic, algebraic identification method for a continuous time constant linear system. We make a specific application in the determination of the parameters of a DC servo motor model. The method is suitable for simultaneously identifying, both, the viscous friction coefficient and the inertia of the motor. It is found that the proposed method is computationally faster and more robust with respect to system noises than conventional methods. The identification algorithm has been verified by both simulation and experimental results. In addition, the identification of the coulomb's friction coefficient of the servo motor model has been investigated.
Conventional Earth Observation Payload Data Ground Segments (PDGS) continuously receive variable ... more Conventional Earth Observation Payload Data Ground Segments (PDGS) continuously receive variable requests for data processing and distribution. However, their architecture was conceived to be on the premises of satellite operators and, for instance, has intrinsic limitations to offer variable services. In the current chapter, we introduce cloud computing technology to be considered as an alternative to offer variable services. For that purpose, a cloud infrastructure based on OpenNebula and the PDGS used in the Deimos-2 mission was adapted with the objective of optimizing it using the ENTICE open source middleware. Preliminary results with a realistic satellite recording scenario are presented
To extend missions lifetime at very low altitudes, an efficient propulsion system is required to ... more To extend missions lifetime at very low altitudes, an efficient propulsion system is required to compensate for aerodynamic drag. One solution is Atmosphere-Breathing Electric Propulsion (ABEP). It collects atmospheric particles to be used as propellant for an electric thruster. The system ideally nullifies the requirement of onboard propellant storage. An ABEP system can be applied to any celestial body with atmosphere (Mars, Venus, Titan, etc.), enabling new mission at low altitude ranges for longer times. Challenging is operation of the thruster on reactive chemical species, such as atomic oxygen (AO), that is highly present in low Earth orbit, as they cause erosion of (not only) propulsion system components, i.e. acceleration grids, electrodes, neutralizers, and discharge channels of conventional EP systems. For this reason, a contactless plasma thruster is developed: the RF helicon-based plasma thruster (IPT). The paper describes the thruster design, implementation, and first i...
Orbiting at lower orbital altitudes, where the residual atmosphere is source of aerodynamic drag ... more Orbiting at lower orbital altitudes, where the residual atmosphere is source of aerodynamic drag requires an efficient drag-compensation system for satellite lifetime extension. One solution is proposed by using Atmosphere-Breathing Electric Propulsion (ABEP), a system that collects atmospheric particles and directly uses them as propellant for an electric thruster. Challenging is also the presence of reactive chemical species at low altitudes, such as atomic oxygen. This is an erosion source of (not only) the propulsion system components, i.e. acceleration grids, electrodes and discharge channels of conventional EP systems such as Radio frequency ion thrusters (RIT) and Hall-effect thrusters (HET). The thruster for an ABEP is proposed to be an Inductive Plasma Thruster (IPT) based on an electrodeless design. Hereby the first step is an efficient plasma source working on atmospheric propellant. Starting from IPG6-S as test-bed, a small scale inductively heated plasma generator at IR...
The treatment of massive and large-sized data obtained from Earth Observation satellite recording... more The treatment of massive and large-sized data obtained from Earth Observation satellite recordings still presents a critical challenge. Remote sensing industries implement on-site conventional infrastructures to acquire, store, process and distribute the geo-information generated. However these solutions are not flexible neither easily scalable. The presented research focuses in the development of future internet technologies in order to improve Earth Observation (EO) services and to highly reduce the costs associated with on premises deployment. On the one hand, the EOD pilot case consists of the deployment in cloud of the gs4EO software, commercialized by Deimos. EOD pilot proposes several scenarios, all of them built with 4EO products: archive4EO collects data from different sources and triggers the processing of the raw data using process4EO; monitor4EO monitors all the process, and the resulting data is accessible using user4EO services (http://www.entice-project.eu/eodusecase)...
D. González, V. Cañas, J. Becedas, R. M. Domínguez, P. C. E. Roberts, N. H. Crisp, V. T. A. Oiko,... more D. González, V. Cañas, J. Becedas, R. M. Domínguez, P. C. E. Roberts, N. H. Crisp, V. T. A. Oiko, S. Edmondson, S. D. Worrall, S. Haigh, K. Smith, R. E. Lyons, S. Livadiotti, C. Huyton, L. A. Sinpetru, A. Striker, S. Rodriguez-Donaire, D. Garcia-Almiñana, M. Sureda, D. Kataria, G. H. Herdrich, F. Romano, Y. Chan, A. Boxberger, S. Fasoulas, C. Traub, R. Outlaw, V. Hanessian, A. Mølgaard , J. Nielsen, M. Bisgaard, R. Villain, J. S. Perez, A. Conte, B. Belkouchi, A. Schwalber, B. Heißerer
D. González, V. Cañas, J. Becedas, R. M. Domínguez, P. C. E. Roberts, N. H. Crisp, V. T. A. Oiko,... more D. González, V. Cañas, J. Becedas, R. M. Domínguez, P. C. E. Roberts, N. H. Crisp, V. T. A. Oiko, S. Edmondson, S. D. Worrall, S. Haigh, K. Smith, R. E. Lyons, S. Livadiotti, C. Huyton, L. A. Sinpetru, A. Striker, S. Rodriguez-Donaire, D. Garcia-Almiñana, M. Sureda, D. Kataria, G. H. Herdrich, F. Romano, Y. Chan, A. Boxberger, S. Fasoulas, C. Traub, R. Outlaw, V. Hanessian, A. Mølgaard , J. Nielsen, M. Bisgaard, R. Villain, J. S. Perez, A. Conte, B. Belkouchi, A. Schwalber, B. Heißerer
Challenging space mission scenarios include those in very low Earth orbits, where the atmosphere ... more Challenging space mission scenarios include those in very low Earth orbits, where the atmosphere creates significant drag to the S/C and forces their orbit to an early decay. For drag compensation, propulsion systems are needed, requiring propellant to be carried on-board. An atmosphere-breathing electric propulsion system (ABEP) ingests the residual atmosphere through an intake and uses it as propellant for an electric thruster. Theoretically applicable to any planet with atmosphere, the system might allow drag compensation for an unlimited time without carrying propellant. A new range of altitudes for continuous operation would become accessible, enabling new scientific missions while reducing the required effort for the launcher by achieving these low orbits. Preliminary studies have shown that the collectible propellant flow for an ion thruster in low Earth orbit (LEO) might not be enough, and that electrode erosion due to aggressive gases, such as atomic oxygen, will limit the ...
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