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Papers by Hendrik Lübberstedt

OHB System’s Small Geostationary Satellite (SGEO) is approaching the first flight for Hispasat HA... more OHB System’s Small Geostationary Satellite (SGEO) is approaching the first flight for Hispasat HAG1 mission. Assembly, Integration and Testing/Validation (AIT/AIV) activities are currently ongoing at satellite level. The elect ronic units of the electric propulsion subsystem (EPPS) have been integrated on the platform and functional tests have been performed. The development is driving towards the integration of the propulsion module, which includes the tanks, the propellant supply ass embly and the cold gas thrusters. The electric thrusters will be mounted in the final sta ges of the integration phase. The paper gives an overview of the SGEO performance and focuses on the development status of the EPPS. The evolution of the satellite platform towar ds a full electric propulsion design is outlined.

56th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law, 2005

54th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law, 2003

ABSTRACT Active post-mission disposal of space structures will have an increased importance in th... more ABSTRACT Active post-mission disposal of space structures will have an increased importance in the future in order to keep the Earth orbit in an acceptable condition for the safe operation of manned and unmanned missions. The objective of the performed European Space Agency study on End-of-Life (EoL-) de-orbiting Strategies was to provide an overview and assessment of propulsion-related methods to de-orbit spacecraft in LEO, or spacecraft which pass through LEO, to assess their applicability to different spacecraft-mission combinations and to establish a know-how basis of End-of-Life de-orbit strategies. The assessment strategy is demonstrated on the example of reference satellites.

Small Satellites for Earth Observation, 2005

After an introduction into the complex task of mission design for satellite constellations, this ... more After an introduction into the complex task of mission design for satellite constellations, this paper provides an overview of the platform concepts for constellation satellites that have been developed at OHB-System. The objectives of these constellations cover Earth Observation, Communication, Navigation, and Reconnaissance. For the SAFIR-2 satellite system OHB performed the development of the gravity-gradient stabilised micro-satellite, which provides global bi-directional telecommunication services. Within the INES study, OHB performed the predevelopment of a LEO constellation for the European Global Navigation Satellite System. INES was configured as a 63/9/3 Walker constellation of three-axis stabilised mini-satellites. OHB-System, as the European service provider of the ORBCOMM communications system, recently has performed a predevelopment of a next generation mini-satellite bus to replace the current Microstar™ platform. SAR-Lupe is a satellite constellation for synthetic aperture reconnaissance, which is scheduled for launch later this year. It consists of up to five spacecraft in three different polar orbit planes, at an altitude of 500 km. The ESA mission named Swarm aims at the mapping of the geomagnetic field with unprecedented accuracy. OHB-System has performed the design development of these spacecraft, the main scientific instrument of which is a magnetometer package carried on an articulated boom.

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2011

Thales Electron Devices GmbH TEDG has developed and is currently qualifying a novel type of ion p... more Thales Electron Devices GmbH TEDG has developed and is currently qualifying a novel type of ion propulsion system based on High Efficie ncy Multistage Plasma Thrusters HEMPTs. This so-called HEMPT Assembly will be integrated on OHB-System AG’s SmallGEO geo-stationary telecommunication platform to perform attitude and orbit control maneuvers for the Hispasat AG1 mission. The HEMPT Assembly consists of four HEMPT Modules and one Power Supply and Control Unit PSCU which supplies the HEMPT Modules with electric power and controls their operation. The so-called HEMPTIS program (HEMP Thruster In orbit verification on SmallGEO) initiated by German Space Agency DLR includes all associated component development, system engineering, testing and qualification activities, and the delivery of the r espective flight units. Currently, the HEMPT Assembly is undergoing the Critical Design Review CDR. All relevant activities to demonstrate the compliance of the HEMPT Assembly with the satellite requirements have been mostly accomplished and production of qualification and flight hardware has been started.

Acta Astronautica, 2005

This paper gives an overview of OHB-Systems prime earth observation activities including optical,... more This paper gives an overview of OHB-Systems prime earth observation activities including optical, infrared and radar systems. It covers in particular the commercial EKOSAT/DIAMANT programme. Further short summaries of the European science missions SPECTRA and FOCUS as well as the German surveillance mission SAR-Lupe are presented. EKOSAT/DIAMANT is designed to fill the gap between modern high spatial resolution multispectral systems and hyperspectral systems with moderate spatial resolution. EKOSAT/DIAMANT shall provide advanced geo-information products based on the Multi-Spectral High-Resolution Sensor (MSRS), which was developed by a German-Israelean consortium. There is currently no remote-sensing system operational with comparable features and capabilities concerning vegetation related applications especially in the field of environmental issues, agriculture and water bodies. The operational demonstrator mission EKOSAT is a Korean-Israelean-German-Russian initiative that aims in utilising the existing proto-flight model of the Korean multipurpose satellite KOMPSAT-1 for a fast in orbit deployment of the MSRS sensor. DIAMANT names the future full operational system based on dedicated small satellites. The basic constellation relying on 2-3 satellites which is extended on market demand.

This paper presents the Magnetic NanoProbe Swarm ission utilising a constellation of several swar... more This paper presents the Magnetic NanoProbe Swarm ission utilising a constellation of several swarms of nano satellites in order to acquire simultanous measurements of the geomagnetic field resolving the local field gradients. The space segment comprises of up to 4 S/C swarms each consisting of up to 6 nano satellites (NanoProbes) and 1 mother spacecraft (MSC) to be launched with a single launcher in polar low Earth orbits. The NanoProbes, equipped with magnetometer payloads operate in the vicinity of the MSCs. The MSCs will eject the NPs after acquisition of the initial orbits, provide control and maintenance of the swarm constellation and serve as communication relay to the ground. The systems design relies on near to medium term technology.

38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2002

Active post-mission disposal of space structures will have an increased importance in the future ... more Active post-mission disposal of space structures will have an increased importance in the future in order to keep the Earth orbit in an acceptable condition for the safe operation of manned and unmanned missions. In a European Space Agency study jointly performed by industry and the German Aerospace Center, propulsive end-of-life de-orbiting concepts are elaborated. Two options, a direct, controlled deorbit as well as a transfer to a limited lifetime orbit are considered. The suitability of various propulsion system options is assessed based on a set of evaluation criteria. These parameters are not limited to a mere comparison of the propulsion system but cover the impact on the entire satellite system as a whole. The assessment strategy is demonstrated by the example of reference satellites.

46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2010

Acta Astronautica, 2005

The initial EKOSAT (ELOP-KARI-OHB-Satellite) mission, planned to be launched as in-orbit demonstr... more The initial EKOSAT (ELOP-KARI-OHB-Satellite) mission, planned to be launched as in-orbit demonstrator of the Multi-Spectral Remote-sensing System (MSRS), is enhanced by the space-proven Hot-Spot-Recognition System (HSRS) from DLR. HSRS is currently demonstrating its advanced High-Temperature Event detection and analysis capabilities on the German Bispectral InfraRed Detection (BIRD) satellite. MSRS, developed by OHB and ELOP, provides high-resolution super-spectral data (VIS/NIR) for ecological applications. Joint operation of MSRS and HSRS will deliver for the first time simultaneously high-resolution super spectral and hot-spot data of hazard events. A feasibility study based on the existing KOMPSAT-1 flight spare model from KARI as spacecraft bus shows that EKOSAT-IR will facilitate a fast in-orbit deployment of MSRS and HSRS at a comparably low-cost. Based mainly on existing ground infrastructure, EKOSAT-IR will demonstrate and deliver new super-spectral and infrared Earth observation products for Earth Watch and GMES objectives as well as for upcoming commercial markets.

Acta Astronautica, 2005

This paper presents the Magnetic NanoProbe Swarm mission utilising a constellation of several swa... more This paper presents the Magnetic NanoProbe Swarm mission utilising a constellation of several swarms of nano satellites in order to acquire simultanous measurements of the geomagnetic field resolving the local field gradients. The space segment comprises of up to 4 S/C swarms each consisting of up to 6 nano satellites (NanoProbes) and 1 mother spacecraft (MSC) to be launched with a single launcher in polar low Earth orbits. The NanoProbes, equipped with magnetometer payloads operate in the vicinity of the MSCs. The MSCs will eject the NPs after acquisition of the initial orbits, provide control and maintenance of the swarm constellation and serve as communication relay to the ground. The systems design relies on near to medium term technology.

OHB System’s Small Geostationary Satellite (SGEO) is approaching the first flight for Hispasat HA... more OHB System’s Small Geostationary Satellite (SGEO) is approaching the first flight for Hispasat HAG1 mission. Assembly, Integration and Testing/Validation (AIT/AIV) activities are currently ongoing at satellite level. The elect ronic units of the electric propulsion subsystem (EPPS) have been integrated on the platform and functional tests have been performed. The development is driving towards the integration of the propulsion module, which includes the tanks, the propellant supply ass embly and the cold gas thrusters. The electric thrusters will be mounted in the final sta ges of the integration phase. The paper gives an overview of the SGEO performance and focuses on the development status of the EPPS. The evolution of the satellite platform towar ds a full electric propulsion design is outlined.

56th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law, 2005

54th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law, 2003

ABSTRACT Active post-mission disposal of space structures will have an increased importance in th... more ABSTRACT Active post-mission disposal of space structures will have an increased importance in the future in order to keep the Earth orbit in an acceptable condition for the safe operation of manned and unmanned missions. The objective of the performed European Space Agency study on End-of-Life (EoL-) de-orbiting Strategies was to provide an overview and assessment of propulsion-related methods to de-orbit spacecraft in LEO, or spacecraft which pass through LEO, to assess their applicability to different spacecraft-mission combinations and to establish a know-how basis of End-of-Life de-orbit strategies. The assessment strategy is demonstrated on the example of reference satellites.

Small Satellites for Earth Observation, 2005

After an introduction into the complex task of mission design for satellite constellations, this ... more After an introduction into the complex task of mission design for satellite constellations, this paper provides an overview of the platform concepts for constellation satellites that have been developed at OHB-System. The objectives of these constellations cover Earth Observation, Communication, Navigation, and Reconnaissance. For the SAFIR-2 satellite system OHB performed the development of the gravity-gradient stabilised micro-satellite, which provides global bi-directional telecommunication services. Within the INES study, OHB performed the predevelopment of a LEO constellation for the European Global Navigation Satellite System. INES was configured as a 63/9/3 Walker constellation of three-axis stabilised mini-satellites. OHB-System, as the European service provider of the ORBCOMM communications system, recently has performed a predevelopment of a next generation mini-satellite bus to replace the current Microstar™ platform. SAR-Lupe is a satellite constellation for synthetic aperture reconnaissance, which is scheduled for launch later this year. It consists of up to five spacecraft in three different polar orbit planes, at an altitude of 500 km. The ESA mission named Swarm aims at the mapping of the geomagnetic field with unprecedented accuracy. OHB-System has performed the design development of these spacecraft, the main scientific instrument of which is a magnetometer package carried on an articulated boom.

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2011

Thales Electron Devices GmbH TEDG has developed and is currently qualifying a novel type of ion p... more Thales Electron Devices GmbH TEDG has developed and is currently qualifying a novel type of ion propulsion system based on High Efficie ncy Multistage Plasma Thrusters HEMPTs. This so-called HEMPT Assembly will be integrated on OHB-System AG’s SmallGEO geo-stationary telecommunication platform to perform attitude and orbit control maneuvers for the Hispasat AG1 mission. The HEMPT Assembly consists of four HEMPT Modules and one Power Supply and Control Unit PSCU which supplies the HEMPT Modules with electric power and controls their operation. The so-called HEMPTIS program (HEMP Thruster In orbit verification on SmallGEO) initiated by German Space Agency DLR includes all associated component development, system engineering, testing and qualification activities, and the delivery of the r espective flight units. Currently, the HEMPT Assembly is undergoing the Critical Design Review CDR. All relevant activities to demonstrate the compliance of the HEMPT Assembly with the satellite requirements have been mostly accomplished and production of qualification and flight hardware has been started.

Acta Astronautica, 2005

This paper gives an overview of OHB-Systems prime earth observation activities including optical,... more This paper gives an overview of OHB-Systems prime earth observation activities including optical, infrared and radar systems. It covers in particular the commercial EKOSAT/DIAMANT programme. Further short summaries of the European science missions SPECTRA and FOCUS as well as the German surveillance mission SAR-Lupe are presented. EKOSAT/DIAMANT is designed to fill the gap between modern high spatial resolution multispectral systems and hyperspectral systems with moderate spatial resolution. EKOSAT/DIAMANT shall provide advanced geo-information products based on the Multi-Spectral High-Resolution Sensor (MSRS), which was developed by a German-Israelean consortium. There is currently no remote-sensing system operational with comparable features and capabilities concerning vegetation related applications especially in the field of environmental issues, agriculture and water bodies. The operational demonstrator mission EKOSAT is a Korean-Israelean-German-Russian initiative that aims in utilising the existing proto-flight model of the Korean multipurpose satellite KOMPSAT-1 for a fast in orbit deployment of the MSRS sensor. DIAMANT names the future full operational system based on dedicated small satellites. The basic constellation relying on 2-3 satellites which is extended on market demand.

This paper presents the Magnetic NanoProbe Swarm ission utilising a constellation of several swar... more This paper presents the Magnetic NanoProbe Swarm ission utilising a constellation of several swarms of nano satellites in order to acquire simultanous measurements of the geomagnetic field resolving the local field gradients. The space segment comprises of up to 4 S/C swarms each consisting of up to 6 nano satellites (NanoProbes) and 1 mother spacecraft (MSC) to be launched with a single launcher in polar low Earth orbits. The NanoProbes, equipped with magnetometer payloads operate in the vicinity of the MSCs. The MSCs will eject the NPs after acquisition of the initial orbits, provide control and maintenance of the swarm constellation and serve as communication relay to the ground. The systems design relies on near to medium term technology.

38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2002

Active post-mission disposal of space structures will have an increased importance in the future ... more Active post-mission disposal of space structures will have an increased importance in the future in order to keep the Earth orbit in an acceptable condition for the safe operation of manned and unmanned missions. In a European Space Agency study jointly performed by industry and the German Aerospace Center, propulsive end-of-life de-orbiting concepts are elaborated. Two options, a direct, controlled deorbit as well as a transfer to a limited lifetime orbit are considered. The suitability of various propulsion system options is assessed based on a set of evaluation criteria. These parameters are not limited to a mere comparison of the propulsion system but cover the impact on the entire satellite system as a whole. The assessment strategy is demonstrated by the example of reference satellites.

46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2010

Acta Astronautica, 2005

The initial EKOSAT (ELOP-KARI-OHB-Satellite) mission, planned to be launched as in-orbit demonstr... more The initial EKOSAT (ELOP-KARI-OHB-Satellite) mission, planned to be launched as in-orbit demonstrator of the Multi-Spectral Remote-sensing System (MSRS), is enhanced by the space-proven Hot-Spot-Recognition System (HSRS) from DLR. HSRS is currently demonstrating its advanced High-Temperature Event detection and analysis capabilities on the German Bispectral InfraRed Detection (BIRD) satellite. MSRS, developed by OHB and ELOP, provides high-resolution super-spectral data (VIS/NIR) for ecological applications. Joint operation of MSRS and HSRS will deliver for the first time simultaneously high-resolution super spectral and hot-spot data of hazard events. A feasibility study based on the existing KOMPSAT-1 flight spare model from KARI as spacecraft bus shows that EKOSAT-IR will facilitate a fast in-orbit deployment of MSRS and HSRS at a comparably low-cost. Based mainly on existing ground infrastructure, EKOSAT-IR will demonstrate and deliver new super-spectral and infrared Earth observation products for Earth Watch and GMES objectives as well as for upcoming commercial markets.

Acta Astronautica, 2005

This paper presents the Magnetic NanoProbe Swarm mission utilising a constellation of several swa... more This paper presents the Magnetic NanoProbe Swarm mission utilising a constellation of several swarms of nano satellites in order to acquire simultanous measurements of the geomagnetic field resolving the local field gradients. The space segment comprises of up to 4 S/C swarms each consisting of up to 6 nano satellites (NanoProbes) and 1 mother spacecraft (MSC) to be launched with a single launcher in polar low Earth orbits. The NanoProbes, equipped with magnetometer payloads operate in the vicinity of the MSCs. The MSCs will eject the NPs after acquisition of the initial orbits, provide control and maintenance of the swarm constellation and serve as communication relay to the ground. The systems design relies on near to medium term technology.