B. Eissfeller - Academia.edu (original) (raw)

Papers by B. Eissfeller

SIGLEAvailable from TIB Hannover: F03B1022 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Tec... more SIGLEAvailable from TIB Hannover: F03B1022 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman

An encouraging concept for position determination of geostationary satellites is the use of the G... more An encouraging concept for position determination of geostationary satellites is the use of the Global Positioning System (GPS). Although the geostationary orbit is well beyond the orbits of the GPS Navstar satellites (i.e. 20 000 km), it is possible to use GPS - as demonstrated with the GPS experiment on board of the German Small Satellite Equator-S. The experiment data have significant impact for the future use of GPS receivers on-board geostationary satellites. In the past, GPS receivers have only been used well below the orbital altitude of the GPS satellites. The reception of GPS signals at greater altitudes has been demonstrated within the Equator-S GPS experiment. As part of this, GPS signals have also been received from the antenna side lobes of the GPS satellites. The maximum altitude where the GPS receiver provided measurements was about 61 000 km.

HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific ... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et a ̀ la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

As humanity faces a century with growing population and simultaneously increasing energy and food... more As humanity faces a century with growing population and simultaneously increasing energy and food necessity, the availability of resources on Earth is becoming an urging problem. The availability and usage of space resources as a possible solution for diminishing terrestrial materials is a controversially, but yet not a newly discussed topic. The project KaNaRiA (from its German acronym: ‘Kognitionsbasierte, autonome Navigation am Beispiel des Ressourcenabbaus im All’) takes up this issue and deals with the design and implementation of a simulator for an autonomous mission targeting asteroid resource extraction. In this paper, an argumentation on the motivation for mining space bodies in general and asteroids in particular is given with a literature retrospective. The KaNaRiA mission is introduced paying special attention to the mission concept and the available and eligible target asteroids. The research institutions contributing to KaNaRiA are presented together with a description...

The evaluation of existing line characteristics and geometric track irregularities, being perhaps... more The evaluation of existing line characteristics and geometric track irregularities, being perhaps dangerous for dynamic safety of railway systems, becomes more and more evident with rising use of tilting trains like the German ICE3 or ICT, as the resulting irregularities may lead to the danger of train derailment. To identify track defects, a new approach of measuring technique using differential GPS and an inertial navigation system to determine the absolute position and ultrasonic devices to determine the peculiar properties of the geometric track quality was developed. By combination of differential GPS (DGPS) and inertial navigation system (INS) the position and the rigid body motions of a measurement platform at a self propelled draisine is determined. This platform is used additionally as a base for measuring the relative position of the left and right railhead vertically and laterally by ultrasonic sensors, so that their position can be described in an earth fixed co-ordinate...

GNSS has deeply entered the consumer market. It is already widely used in car navigation systems,... more GNSS has deeply entered the consumer market. It is already widely used in car navigation systems, cell phones, and various other applications of daily life. More sophisticated applications for professional and reliability critical applications like road tolling, anti-theft systems and tracking of the transport of hazardous material have already been implemented or are under development. The wide range of GNSS based applications nevertheless also attracted the appearance of jamming devices, which showed the inherent weakness of current satellite navigation systems: the extremely low signal power. ‘Privacy Protection Devices’, small mobile jammers, have appeared on the market and also the possibility of spoofing has already been demonstrated, e.g. in [7]. It is probably only a matter of time until also low-cost spoofing devices will appear on the market. To sustain the navigation capabilities even under harsh signal environments, as well as intentional interference, it is necessary to...

ABSTRACT The successfully usage of spaceborne GPS receivers for orbit- and attitude determination... more ABSTRACT The successfully usage of spaceborne GPS receivers for orbit- and attitude determination has in the past mainly been applied for spacecraft in near-circular Low Earth Orbits (LEO), e.g. TOPEX/POSEIDON, RADCAL. However, no experience exists of using GPS signals for Spacecraft navigation in altitudes above the GPS (20.000 km), such as the Geostationary Orbit (GTO). In this context, EQUATOR-S with it`s highly ellipitcal orbit offers a unique possibility in order to increases significantly the experience concerning GPS visibility, signal reception and GPS based navigation. The application of GPS based spacecraft navigation in GEO`s and GEO`s will bring advantages in many aspects. Besides orbit/attitude determination, GPS offers a potential for increasing command capabilities and decreasing ground station support. This will lead to a reduction of mission cost especially for LEOP phase of geostationary satellites. This paper describes first experiences in operating a GPS receiver in a highly elliptical orbit and presents first results of GPS visibilty and signal reception conditions within this orbit.

2010 5th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC), 2010

This paper focuses the attention on the problem of Radio Frequency Interference (RFI) mitigation ... more This paper focuses the attention on the problem of Radio Frequency Interference (RFI) mitigation in the framework of GNSS. The paper concentrates on interference mitigation algorithms to be applied within the digital part of a GNSS receiver. The first part of the paper focuses on the mitigation of RFI based on Wavelets. The theoretical fundamentals of the approach are presented,

2012 6th ESA Workshop on Satellite Navigation Technologies (Navitec 2012) & European Workshop on GNSS Signals and Signal Processing, 2012

ABSTRACT Every GNSS user is interested in having high accuracy PVT solutions. However, for most m... more ABSTRACT Every GNSS user is interested in having high accuracy PVT solutions. However, for most mass market applications like location based services or road navigation, having a first position fix within few seconds is more important than waiting some time for an accurate solution. One of the biggest contributions to the TTFF is the time needed to retrieve the navigation data coming with the data message. The concept presented in this paper aims at improving the TTFF performance of navigation receivers by defining a set of clock and ephemeris data (CED) with reduced size. This newly defined message types could be added into the transmission schemes of today's and future GNSS to allow for higher CED repetition rates and thus shorter TTFF. Like other parameters, satellite ephemeris and clock corrections are delivered to the users in binary form. The reduction of the size of these data is therefore corresponding to a reduction of the accuracy with which the parameters describing the satellite's orbit and clock drift are represented and delivered to the users. The idea behind the concept of transmitting reduced CED is that mass market users might tolerate an initial degraded accuracy to have the possibility of a faster first position fix. In order to simplify the generation of this new set of data, rather than computing new parameters from scratch, a very straightforward approach is proposed. The algorithm should take the broadcast CED that are already available in the satellites and obtain the new parameters by a simple reduction of the number of bits assigned to them. The concept has been implemented with an experimental design based on the current data of the GPS L1 C/A code signal, aiming at minimizing the number of bits while not exceeding a horizontal position error of 100 m. After achieving a volume reduction of about 52%, the compliance to the requirement was verified by applying the reduction algorithm to the CED issues broadcast by GPS during the last 10 years, and- estimating the horizontal user position error for each of them over the four hours of their validity interval. Some application possibilities for the proposed concept are mentioned, like the inclusion of this data into the transmission pattern of todays and future GNSS signals, increasing the CED repetition rates. In particular the suitability for a new kind of acquisition aiding signal has been underlined. Concerning future work on this concept, there are already plans for a detailed design, tailored to specific GNSS messages, like the Galileo I/NAV. Moreover advanced optimization techniques for the implementation of the reduction algorithm will be investigated.

Experience with the ASN-16 GLONASS (Russian Global Space Navigation System), a slow sequencing C/... more Experience with the ASN-16 GLONASS (Russian Global Space Navigation System), a slow sequencing C/A code receiver working on one channel, is described. It is basically designed for airborne applications but can also be used in terrestrial and maritime applications. It consists of a navigation computer; an RF unit, a control and display unit as well as antenna and preamplifier. An ARINC 429 compatible interface enables data transfer between receiver and external units (input of inertial aiding data, output of position, velocity, and time). A software upgrade also provides access to ephemeris, almanac, pseudorange, and pseudodoppler measurements. The ASN-16 equipment is described on hardware and software level. The first results of test measurements and material on the actual GLONASS constellation is presented. During the test period horizontal position errors of up to 30 m were measured within 24 hours in stationary mode.

IAIN World Congress/US ION …, 2000

A GNSS-2 has to overcome the basic deficiencies, ie the lack of integrity, availability, continui... more A GNSS-2 has to overcome the basic deficiencies, ie the lack of integrity, availability, continuity and accuracy in the Signal-In-Space (SIS), of present satellite navigation systems as the US Global Positioning System (GPS) and the Russian Global ...

2010 5th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC), 2010

2012 6th ESA Workshop on Satellite Navigation Technologies (Navitec 2012) & European Workshop on GNSS Signals and Signal Processing, 2012

IAIN World Congress/US ION …, 2000