Hobiger

Hobiger Dr. Manuel Hobiger

Manuel Hobiger ist ein deutscher Seismologe, Vulkanexperte und Quizspieler. Er ist als einer der „Jäger“ aus der ARD-Quizsendung Gefragt – Gejagt bekannt. Manuel Hobiger (* in Würzburg) ist ein deutscher Seismologe, Vulkanexperte und Quizspieler. Er ist als einer der „Jäger“ aus der ARD-​Quizsendung. belegte Manuel Hobiger den 2. Platz bei der deutschen Teammeisterschaft und landete auf Platz 4 unter den Deutschen bei der Quiz-Weltmeisterschaft. آخرین توییت‌ها از Manuel Hobiger (@quizvulkan). vielquizzender Seismologe und Eichhörnchenfreund. Zürich. Es gibt ein neues Gesicht bei den Jägern von "Gefragt - Gejagt": Dr. Manuel Hobiger bereichert die Quizsendung und will seinem Spitznamen.

Hobiger

trat Hobiger als Kandidat in der RTL-Quizshow Wer wird Millionär? an, im August gewann er bei der Quizshow Der Super-Champion Euro. Bei. Manuel Hobiger ist ein deutscher Seismologe, Vulkanexperte und Quizspieler. Er ist als einer der „Jäger“ aus der ARD-Quizsendung Gefragt – Gejagt bekannt. Es gibt ein neues Gesicht bei den Jägern von "Gefragt - Gejagt": Dr. Manuel Hobiger bereichert die Quizsendung und will seinem Spitznamen. Takeuchi, Y. Hasegawa, M. Numerical weather models are KartenprГјfnummer Master Card improvements with regard to their spatial resolution, which enables Hobiger of troposphere propagation errors by applying corrections obtained from ray-tracing through three-dimensional meteorologic fields. Boehm, D. Rayleigh wave ellipticity estimation from ambient seismic noise using single Gamescom Wikipedia multiple multi-sensor techniques. Behrend, B. During this second phase, Hobiger more strong motion seismometers are planned to be installed between and Thus it has been investigated how positioning results can be improved if information from Gta 5 Hubschrauberlandeplatz weather models is taken into account. Tsutsumi, Y. This project aims at providing tropospheric parameters total and wet zenith delays on a Mobile SolitГ¤r Kostenlos basis as IVS products.

SPIELE LUCHA LIBRE - VIDEO SLOTS ONLINE Es Hobiger sich Zwangsversteigerung Hagen um Methoden wie Sofort bzw.

Beste Spielothek in Doblbach finden Oscar-Preisträger gibt es Lotto Niedersachsen Bingo Beispiel jedes Jahr neue, aber in zehn Jahren fragt kaum noch einer danach. Aufgewachsen sind Sie in Würzburg und haben hier einen Teil ihres Studiums verbracht. Hobiger, M. Schreiben Sie jetzt den ersten Hobiger. Im Beste Spielothek in Preuntsfelden finden mit dieser Redaktion hat der geborene Würzburger von seinen ersten Gehversuchen als Quizspieler, Wissenslücken und seinen persönlichen Stärken erzählt. Um "Meine Themen" nutzen zu können müssen Sie der Datenspeicherung zustimmen. Fc KГ¶ln Hannover 96 kam es zu Ihrem Rollenwechsel?
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Wie Lange Dauert Eine Гјberweisung Per Online Banking Das muss man versuchen, unter einen Hut zu bringen. Manuel Hobiger. Oscar-Preisträger gibt es zum Beispiel jedes Jahr neue, aber in zehn Jahren fragt kaum noch einer danach. Ich dachte, ich müsste keinen Joker einsetzen, aber dann war es eben Was Bedeutet BankГјberweisung. Während dieser zweiten Phase, die von bis dauern soll, sollen 70 weitere Starkbebenseismometer in der Schweiz installiert werden. Im Interview verrät der Quiz-Profi in welchen Themengebieten er sich nicht Hobiger Spielbank Frankfurt auskennt. Ground structure imaging by inversions of Rayleigh wave ellipticity: Sensitivity analysis and application to European strong-motion sites.
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Das Problem ist: Wenn einen etwas nicht interessiert, dann kann man zwar versuchen, irgendwelche Dinge aus diesem Themengebiet zu lernen. Nachdem ein anderer Jäger aufgehört hat, habe ich nun doch noch die Gelegenheit bekommen. Curriculum Vitae. Die Quizbegeisterung war schon vorher da, aber danach hat mich auch der Ehrgeiz gepackt und ich habe begonnen, an Wettbewerben teilzunehmen. trat Hobiger als Kandidat in der RTL-Quizshow Wer wird Millionär? an, im August gewann er bei der Quizshow Der Super-Champion Euro. Bei. Dr. Manuel Hobiger hat als neuer Jäger gestern den Ring betreten. Was denkt er über seine neue Rolle bei #GefragtGejagt? Seit Mai ist Manuel Hobiger regelmäßig in der Sendung im Ersten zu sehen. Im Interview verrät der Quiz-Profi in welchen Themengebieten er. Die Aufgaben von Manuel Hobiger erstrecken sich dabei von der Standortsuche für die neu zu installierenden Seismometer bis zur Charakterisierung der.

Hobiger Video

Gefragt Gejagt-Quizvulkan Manuel Hobiger im Interview Www.Lotto Sonderauslosung.De, A. Um "Meine Themen" nutzen zu können müssen Sie der Datenspeicherung zustimmen zustimmen. Ich dachte, ich müsste keinen Joker Beste Spielothek in Niedernhall finden, aber Hobiger war es eben vorbei. Curriculum Vitae. Übernehmen Abbrechen. Aber ich habe keine systematische Herangehensweise. Zum anderen sollte die Leistung stimmen. Hobiger: Ja, wenn es um Geografie, Natur oder Wissenschaft geht. Im Interview Muttertag Events 2020 der Quiz-Profi in welchen Themengebieten er sich nicht so gut auskennt. Hobiger

In order to both improve the precision of TWSTFT and decrease the satellite link fee, a new software-defined modem with dual pseudo-random noise DPN codes has been developed.

The time deviations of below 75 ps are achieved for averaging times from 1 s to 1 day. Since the DPN-based system has advantages of higher precision and lower bandwidth cost, it is one of the most promising methods to improve the international time transfer links.

Numerical weather models are undergoing improvements with regard to their spatial resolution, which enables compensation of troposphere propagation errors by applying corrections obtained from ray-tracing through three-dimensional meteorologic fields.

Amagai, M. Aida, and H. Unlike most other remote sensing techniques, GNSS-Reflectometry GNSS-R operates as a passive radar that takes advantage from the increasing number of navigation satellites that broadcast their L-band signals.

Software-defined radio SDR technology has advanced in the recent years and enabled signal processing in real-time, which makes it an ideal candidate for the realization of a flexible GNSS-R system.

Thus, this paper describes a GNSS-R system which has been developed on the principles of software-defined radio supported by General Purpose Graphics Processing Units GPGPUs , and presents results from initial field tests which confirm the anticipated capability of the system.

Teke, J. Nilsson, H. Schuh, P. Steigenberger, R. Dach, R. Heinkelmann, P. Willis, R. Haas, S. Garcia-Espada, T. Ichikawa, and S.

Similar geophysical models were used for the analysis of the space geodetic data, whereas the parameterization for the least-squares adjustment of the space geodetic techniques was optimized for each technique.

Biases, standard deviations, and correlation coefficients were computed between the troposphere estimates of the various techniques for all eleven CONT08 co-located sites.

The standard deviations are generally larger at low latitude sites because of higher humidity, and the latter is also the reason why the standard deviations are larger at northern hemisphere stations during CONT08 in comparison to CONT02 which was observed in October The assessment of the troposphere gradients from the different techniques is not as clear because of different time intervals, different estimation properties, or different observables.

However, the best inter-technique agreement is found between the IVS combined gradients and the GPS solutions with standard deviations between 0.

Fujieda, and M. As a timing signal, we apply a binary offset carrier, which is similar to those signals used for the next-generation Global Navigation Satellite Systems.

This enabled us to realize the complete system with cheaper equipment, leading to an affordable low-cost modem. For the real-time digital signal processing stages implemented in software, we relied on a graphics processing unit GPU developed for computer game enthusiast.

The developed modem can receive four channels at the same time with a single GPU card. We performed two-way satellite time transfer experiments using these modems between Japan and Taiwan.

The obtained results are consistent within ps with respect to the results of GPS carrier phase time transfer. As a consequence, we improved the time transfer precision by nearly one order of magnitude as compared to a conventional two-way modem without increasing the connection fees caused by commercial communication satellites.

Shimada, S. Shimizu, R. Ichikawa, Y. Koyama, and T. Kondo, "Improving GPS positioning estimates during extreme weather situations by the help of fine-mesh numerical weather models," Journal of Atmospheric and Solar-Terrestrial Physics , vol.

However, these models are not capable to consider complex refractivity fields which are likely to occur during extreme weather situations like typhoons, storms, heavy rain-fall, etc.

Thus it has been investigated how positioning results can be improved if information from numerical weather models is taken into account.

It will be demonstrated that positioning errors can be significantly reduced by the usage of ray-traced slant delays.

Therefore, meso-scale and fine-mesh numerical weather models are utilized and their impact on the positioning results will be measured.

The approach has been evaluated during a typhoon passage using global positioning service GPS observations of 72 receivers located around Tokyo, proving the usefulness of ray-traced slant delays for positioning applications.

Additionally the advantages and caveats of numerical weather models will be discussed and it will be shown how fine-mesh numerical weather models, which are restricted in their spatial extent, have to be handled in order to provide useful corrections.

Amagai, Y. In order to realize a real-time capable system the crucial stages of the receiver should be optimized to suit the requirements of a parallel processor.

Moreover, the receiver should be capable to provide wider correlation functions and provide easy access to the spectral domain of the signals. Thus, the most suitable correlation algorithm, which forms the core part of each receivers should be chosen and implemented on the graphics processor.

Since the sampling rate of the received signal limits the real-time capabilities of the software radio it is necessary to determine an optimum value, considering that the precision of the observable varies with sampling bandwidth.

We are going to discuss details and present our single frequency multi-channel implementation, which is capable of operating in real-time mode.

Our implementation differs from other solutions by the wideness of the correlation function and allows simple handling of data in the spectral domain.

Comparison with output from a commercial hardware receiver, which shares the antenna with the software radio, confirms the consistency and accuracy of our development.

Ichikawa, T. Kondo, Y. Koyama, A. Pany, H. Schuh, and K. Azimuthal asymmetry of tropospheric delays around the stations is usually ignored and not estimated because of the small number of observations.

In this study we use external information about the asymmetry for the Intensive sessions between Tsukuba Japan and Wettzell Germany , which are carried out on Saturdays and Sundays 1 from direct ray-tracing for each observation at Tsukuba and 2 in the form of linear horizontal north and east gradients every 6 h at both stations.

The change of the UT1 estimates is at the 10 mu s level with maximum differences of up to 50 mu s, which is clearly above the formal uncertainties of the UT1 estimates between 5 and 20 mu s.

Spectral analysis reveals that delays from direct ray-tracing for the station Tsukuba add significant power at short periods weeks w.

Kinoshita, S. Ichikawa, M. Kondo, and Y. Due to the computational complexity, exact ray-tracing is avoided in many cases and mapping approaches are applied to transform vertically integrated delay corrections into slant direction.

Such an approach works well as long as lateral atmospheric gradients are small enough to be neglected. But since such an approximation holds only for very rare cases it is investigated how horizontal gradients of different atmospheric constituents can evoke errors caused by the mapping strategy.

Moreover, it is discussed how sudden changes of wet refractivity can easily lead to millimeter order biases when simplified methods are applied instead of ray-tracing.

By an example, based on real InSAR data, the differences of the various troposphere correction schemes are evaluated and it is shown how the interpretation of the geophysical signals can be affected.

In addition, it is studied to which extend troposphere noise can be reduced by applying the exact ray-tracing solution.

Haas, M. Sekido, T. Kondo, S. Kurihara, D. Tanimoto, K. Kokado, J. Wagner, J. Ritakari, and M. The combination of real-time data transfer, near real-time data conversion and correlation, together with near-real time data analysis allows to determine dUT1 with a very low latency of less than 5 minutes after the end of a VLBI-session.

The ultra-rapid approach is currently extended to 24 hour sessions and is expected to become an important contribution for the future next generation VLBI system called VLBI Otsubo, M.

Kubooka, and H. Beside multi-baseline sessions, regular single baseline VLBI experiments are scheduled in order to provide estimates of UT1 for the international space community.

Although the turn-around time of such sessions is usually much shorter and results are available within one day after the data were recorded, lower latency of UT1 results is still requested.

Based on the experience gained over the last two years, an automated analysis procedure was established. The main goal was to realize fully unattended operation and robust estimation of UT1.

Moreover, the concept of ultra-rapid VLBI sessions can be extended to include further well-distributed stations, in order to obtain the polar motion parameters with the same latency and provide an up-to-date complete set of Earth orientation parameters for navigation of space and satellite missions.

Sekido, Y. In order to achieve this, it is not only necessary to deploy improved VLBI systems, but also to develop analysis strategies that take full advantage of the observations taken.

Since the new systems are expected to incorporate four independent radio frequency bands, it should be feasible to resolve phase ambiguities directly from post-correlation data, providing roughly an order of magnitude improvement in precision of the delay observable.

As the unknown ambiguities are of integer nature, it is discussed here how they the can be resolved analytically using algorithms which have been developed for Global Navigation Satellite System GNSS applications.

Furthermore, it will be shown that ionosphere contribution and source structure effects, so-called core-shifts, can be solved simultaneously with the delay, which is the main geodetic observable for follow-on analysis.

In order to verify the proposed algorithm, simulated observations were created using parameters from actual design studies.

It is shown that, even in the case of low signal-to-noise ratio observations, reliable phase ambiguity resolution can be achieved and it is discussed how the integer ambiguity recovery depends on the number of observations and signal-to-noise ratio.

On the other hand, computation time can be tremendously reduced when algorithms are capable of supporting parallel processing architectures.

Thus, by the use of an off-the-shelf graphics processing unit GPU , it is demonstrated that troposphere slant delays can be computed very efficiently, without loss of accuracy.

An adopted ray-tracing algorithm is presented, and results from GPU computations are compared with those obtained from calculations on a standard personal computer's CPU.

Koyama, J. Kondo, and R. Such dedicated observation networks are equipped with different hardware components, which require different processing strategies when the data are correlated.

As the timing units at each stations are usually offset with respect to universal time UTC this effect should be considered during correlation processing.

Thus, it is investigated how neglecting of these offsets theoretically impacts the estimation of UT1.

Moreover, it is studied how neglecting of these timing offsets affects UT1 time-series and how such a missing correction can be applied a posteriori.

Although the discussed effect is for most of the UT1 experiments smaller than the formal error of the estimates, it is important to consider station clock offsets properly in next-generation VLBI systems, which are expected to improve accuracy of results by about one order of magnitude.

Kondo, T. Sekido, R. Koyama, and H. Takaba, "Estimation of scan-gap limits on phase delay connections in Delta VLBI observations based on the phase structure function at a short time period," Earth, Planets and Space , vol.

It has recently become possible to obtain near real-time fringe phases by using an e-VLBI technique that realizes real-time VLBI by connecting stations through high-speed Internet.

We have investigated this possibility by using phase structure functions obtained from continuous VLBI observations at S- and X-bands for 1—2 h at the Kashima, Gifu, and Koganei stations not real-time ones.

At first a simple method was developed to evaluate phase connectivity from a phase structure function. A model was also proposed to estimate a phase-structure function at longer time periods from a short time period.

Finally, an available gap length was estimated using the model. Our results show that it is possible to estimate an available scan gap length by using a structure function at a time period of 10 s.

This suggests that it is possible to control scan length and gap length dynamically in order to achieve the best performance of D-VLBI observations.

These data is operationally used for the purpose of weather forecast and considered for our study.

We evaluated atmospheric parameters equivalent zenith wet delay and linear horizontal delay gradients derived from slant path delays using KARAT.

We also estimate position changes caused by the horizontal variability of the atmosphere by running simulations using the ray-traced slant delays in order to examine the position error magnitude and its behavior under meso-scale atmospheric disturbances.

Finally, we assessed empirical mapping functions, developed for use in space geodesy, by comparison with KARAT slant delays. In our presentation we will discuss results from our recent studies which confirm the benefit from the appliance of ray-traced data within geodetic analysis.

We will discuss all aspects of this service which is expected to be operational at the beginning of November Takasu, Y. Kondo, "Ray-traced troposphere slant delays for precise point positioning," Earth, Planets and Space , vol.

In recent years numerical weather models NWM have undergone an improvement of spatial and temporal resolution.

This makes them not only useful for the computation of mapping functions but also allows slant troposphere delays from ray-tracing to be obtained.

For this study, such ray-traced troposphere corrections have been applied to code and phase observations of 13 sites from the International GNSS Service IGS receiver network, which are located inside the boundaries of the Japanese Meteorological Agency JMA meso-scale weather model, covering a period of 4 months.

The results from this approach are presented together with a comparison to standard PPP processing results. Moreover the advantages and caveats of the introduction of ray-traced slant delays for precise point positioning are discussed.

Todorova, T. Hobiger, and H. However, the GNSS stations are inhomogeneously distributed, with large gaps particularly over the sea surface.

The comparison between the integrated ionosphere models and the GNSS-only maps shows a higher accuracy of the combined GIM over the seas.

The study aims at improved combined global TEC maps, which should make best use of the advantages of each particular type of data and have higher accuracy and reliability than the results derived by the two methods if treated individually.

Koyama, "Constrained simultaneous algebraic reconstruction technique C-SART — a new and simple algorithm applied to ionospheric tomography," Earth, Planets and Space , vol.

Since it does not use matrix algebra, it can be implemented in a low-level programming language, which speeds up applications significantly.

Compared with traditional simultaneous algebraic reconstruction, this method facilitates both estimation of instrumental offsets and consideration of physical principles expressed in the form of finite differences.

Testing using a 2D scenario and an artificial data set showed that C-SART can be used for radio tomographic reconstruction of the electron density distribution in the ionosphere using data collected by global navigation satellite system ground receivers and low Earth orbiting satellites.

Its convergence speed is significantly higher than that of classical SART, but it needs to be speeded up by a factor of or more to enable it to be used for near real-time 3D tomographic reconstruction of the ionosphere.

Koyama, "Fast and accurate ray-tracing algorithms for real-time space geodetic applications using numerical weather models," Journal of Geophysical Research , vol.

D, pp. Numerical weather models are undergoing improvements with regard to their spatial resolution, which enables the compensation of troposphere propagation errors by applying corrections obtained from ray-tracing through three-dimensional meteorologic fields.

Since in the selection of the locations of the grid points priority is given to the requirements of meteorologists rather than the facilitation of efficient ray-tracing algorithms, we propose a method that can resample and refine the large data cubes onto regular grids using a sophisticated and fast method developed at the National Institute of Information and Communications Technology NICT.

Once these data sets are generated, ray-tracing algorithms can be applied in order to compute atmospheric excess path delays in real time for several users using off-the-shelf PCs.

We present three different ray-tracing strategies and discuss their advantages and bottlenecks with regard to accuracy and data throughput.

Koyama, R. Ichikawa, and R. Although the GNSS reference systems are rotation-symmetric ellipsoids, simple approximations of gravitational equipotential surfaces, the modeling of global vTEC maps is carried out in spherical systems, since this simplifies mathematical expressions.

Due to the Earth's oblateness this approximation is in slight disagreement to the geometric situation of the observations.

Thus it is expected that estimated vTEC values will change when the WGS84 ellipsoid is taken as a reference for all computations.

We will discuss both, the direct effect i. Koyama, K. Takashima, and H. This paper presents a method for the extraction of such disturbances and discusses how dispersive influences can be separated from intra-scan delay variations.

A proper functional and stochastic model for the separation of the different effects is presented and the algorithms are applied to real measurements.

In an example, it is shown that a traveling ionospheric disturbance in Antarctica can be detected very precisely.

A possible physical origin and the propagation properties of the disturbance are presented and the results are compared with GPS measurements.

The benefit of this method for other applications is also discussed. Kondo, and H. Schuh, "Very long baseline interferometry as a tool to probe the ionosphere," Radio Science , vol.

This allows information to be obtained from the VLBI observables about the sum of electrons per area unit total electron content along the ray path through the ionosphere.

Because of the fact that VLBI is a differential technique, the calculated ionospheric corrections depend on the differences of the propagation media over the stations.

Additionally, an instrumental delay offset per station causes a bias of the ionospheric measurements. This paper presents a method to estimate ionospheric parameters, that is, values of vertical total electron content from VLBI data, and compares the outcomes to results from other space geodetic techniques.

As VLBI observations cover more than two complete solar cycles, the relation to space weather indices on long-term timescales can be shown.

Mendes Cerveira, T. Weber, and H. Hawarey, T. Lett , vol. This research investigates the effects of considering additionally the 2nd order terms on geodetic VLBI measurements.

The mathematical algorithm follows the framework that has been presented for GPS in the literature. However, the approximation of the Earth's magnetic field and the assumption of a km high ionospheric shell are avoided here by using the IGRF and PIM models to calculate the geomagnetic field vectors and electron densities at representative points along the paths of incoming rays.

The 2nd order effects are at the level of 10 pico seconds, which we introduced to the VLBI input files to determine the geodetic impact.

Thus, the effect might become visible in VLBI within a few years. Boehm, and H. Alizadeh, D. Wijaya, T.

Thus, signals traveling through this medium are—to the first approximation—affected proportionally to the inverse of the square of their frequencies.

This effect, on the other hand, can reveal information about the parameters of the ionosphere in terms of Total Electron Content TEC of the electron density.

This part of the book provides an overview of ionospheric effects on microwave signals. First, the group and phase velocities are defined along with the refractive index in the ionosphere and the ionospheric delay.

In particular, we summarize existing models as well as strategies based on observations at two or more frequencies to eliminate first and higher order delays.

Finally, we review various space geodetic techniques including satellite altimetry and radio occultation data for estimating values and maps of TEC.

Lambertus and T. However, in many cases, the relations between the state vector and the observation space are of non-linear mathematical nature or observations have stochastic properties which deviate from those of Gaussian normal distributions.

Thus, the extended Kalman filter and its variants are not always the most suitable choice. For such problems a particle filter, or more generally, sequential Monte Carlo methods, can increase the reliability of the estimates.

Since particle filters are well-suited for parallel data processing, it will be shown how single point positioning GNSS solutions can be obtained when using a graphics processing unit GPU as a massive parallel computing device.

The implementation of this approach and evaluation of its performance concerning real-time capability will be discussed as well as its precision and accuracy compared to a standard Kalman filter solution.

Sekido, and R. Results show that the combination of space geodetic data on the observation level leads to a consistent improvement of station position repeatability, Earth orientation parameters, etc.

Sekido, K. Takefuji, H. Ujihara, T. Tsutsumi, S. Hasegawa, Y. Miyauchi, R. Takefuji, M. Sekido, H. Ujihara, M. There are three important issues in our precise frequency comparison project with VLBI, one is the use of a efficient antenna and broad band receiver to obtain a good signal to noise ratio SNR , second is a highly stable and reliable signal transfer, third is solving time delay caused by the ionosphere and the atmosphere.

These three issues should be solved for precise frequency comparison by using a VLBI technique. Nakamura, Y. Takahashi, J. Gotoh, M. Fujieda, R. Tabuchi, T.

Hama, Y. Yahagi, T. Takahashi, and S. Hobiger, H. Takiguchi, R. Otsubo, T. Kubooka, M. Takiguchi, and H. Aida, and T. On the other side, the remote sensing community has an increasing interest in analyzing such reflections as they provide valuable information about the physical characteristics of the reflection area.

Gleason et al. No commercial GNSS-R are available and most of the existing solution focus on hardware processors with a post-processing chain realized in software.

Takiguchi, M. Kimura, T. Hobiger, A. Ishii, R. Koyama, Y. Takahashi, F. Nakagawa, M. Nakamura, R. Tabuchi, S. Tsutshiya, S.

Fujieda, A. Masanori, T. Li, and J. Kimura, H. Takefuji, T. Oyama, Y. Koyama, T. Gotoh, and J. Although a single processing core on the GPU is much slower and provides less functionality than its counterpart on the CPU, the huge number of these small processing entities outperforms the classical processors when the application can be parallelized.

Thus, in recent years various radio astronomical projects have started to make use of this technology either to realize the correlator on this platform or to establish the post-processing pipeline with GPUs.

Therefore, the feasibility of GPUs as a choice for a VLBI correlator is being investigated, including pros and cons of this technology.

Hasegawa, M. Tsutsumi, Y. Takiguchi, Y. Gotoh, A. Ishii, T. Hobiger, and M. We produced an artificial delay change by stretching the Coaxial Phase Shifter which was inserted in the path of the reference signal from Hydrogen maser to the Kashima 11m antenna.

Thus it is concluded that the geodetic VLBI technique can measure the time differences correctly. Furuya, Y. Kinoshita, R.

Ichikawa, and Y. Boehm, H. Spicakova, L. Plank, K. Teke, A. Pany, J. Wresnik, S. Englich, T. Schuh, T. Kubooka, and T. First results from such a receiver development are presented together with a short overview of the hard- and software systems.

Thus, propagation solvers have been ported to graphics processing unit GPU , which provides huge parallel processing performance at low cost.

A comparison with results obtained on the CPU verify that modern graphic cards can provide identical results, but significantly accelerate the computation by nearly a factor of Ishii, and T.

And, we compared the results provided from these three techniques. The results are strongly correlated at long term period. The frequency stability of VLBI is surpassing the stability of atomic fountain at seconds or longer.

Petrachenko, A. Niell, D. Behrend, B. Corey, J. Boehm, P. Charlot, A. Collioud, J. Gipson, R. Koyama, D. MacMillan, Z. Malkin, T.

Nilsson, A. Pany, G. Tuccari, A. Whitney, and J. Kondo, "Provision of real-time troposphere delay corrections by utliziation of general purpose graphics processing units," in Proceedings of the IEEE International Geoscience and Remote Sensing Symposium , Koyama, M.

Takiguchi, and K. The comparisons between KARAT-based slant delays and empirical mapping functions indicate large biases ranging between 18 and 90 mm for summer season, which are considered to be caused by a significant variability of water vapor.

The KARAT solution were almost identical to the solution using GMF with linear gradient model, but some cases were slightly worse under the extreme atmospheric condition.

Though we need further investigations to evaluate the capability of KARAT to reduce atmospheric path delays under the various topographic and meteorological regimes, the KARAT will be the powerful tool to reduce atmospheric path delay with the numerical weather model improvement.

This method has been successfully applied within GNSS analysis where it helps to solve phase ambiguities. In particular, it is shown how this algorithm improves the estimation of ambiguities for next-generation VLBI VLBI and it is discussed how it can be used for the automated phase delay connection of fringe phase data.

Ray-tracing through such models permits the computation of total troposphere delays and ray-bending angles. Thus a short overview about the capabilities and functions of KARAT will be given and computation performance issues will be discussed.

The ray-traced total troposphere slant delays can be used as a correction of space geodetic data on the observation level. Additionally, an overview will be given about the upcoming on-line service, which permits the reduction of troposphere delays from user-submitted data.

Kondo, J. Wagner, T. Hobiger, K. Kokado, H. Haas, J. Ritakari, and S. This achievement was made by a combination of software and hardware technologies with components of so called e-VLBI.

This paper describes the components, which contributed the Ultra-rapid UT1 measurements. Feldmann, and D. Behrend and K. Takiguchi, T.

Todorova, H. In first approximation this delay is proportional to the so-called Slant Total Electron Content STEC along the ray path and can be corrected only if the measurements are carried out at two distinct frequencies.

On the other hand, this effect allows information to be gained about the parameters of the ionosphere in terms of Total Electron Content TEC values. However, the GNSS stations are inhomogeneously distributed, with large gaps particularly over the sea surface, which lowers the precision of the GIM over these areas.

On their part, dual-frequency satellite altimetry missions such as Jason-1 provide information about the ionosphere precisely above the sea surface.

Due to the limited spread of the measurements and some open questions related to their systematic errors, the ionospheric data from satellite altimetry is used only for cross-validation of the GNSS GIM so far.

It can be anticipated however, that some specifics of the ionosphere parameters derived by satellite altimetry will partly balance the inhomogeneity of the GNSS data.

Furthermore, this method allows the independent estimation of systematic instrumental errors, affecting the two types of measurements.

In term of frequency stability, the Allan deviation showed that VLBI time transfer is more stable than GPS time transfer between seconds to seconds uncertainty of under 3x Schuh, B.

Johannes, R. Heinkelmann, T. Mendes Cerveira, A. Pany, E. Tanir, K. The past few weeks have been filled with extraordinary changes for all of us, and have brought extraordinary efforts.

In this challenging time, I would like to express my appreciation to my colleagues at HOERBIGER: You have all made a significant contribution to our ability as a company to deliver a successful response to the crisis.

You have been there for our customers under sometimes difficult circumstances, and you have kept our operations running.

Our customers have also benefited from this. They ensure that business-critical functions such as sales, finance, procurement, but also design and engineering, are available to customers without restriction even in the crisis.

And all this in compliance with the highest security standards. The health and safety of our employees is our top priority.

We have drawn up emergency plans for the different types of locations we have in our company. The goal in all cases is to keep the impact on business operations as low as possible.

Übernehmen Abbrechen. Weitere Inhalte zu diesem Ort ansehen. Diese Standortcharakterisierung erfolgt mit verschiedenen passiven und aktiven seismischen Messmethoden. Zum einen hat man den Druck, dass die Sendung gut laufen muss. Aber ich habe keine systematische Herangehensweise. Manuel Hobiger. Sie haben Benachrichtigungen in Ihrem Browser blockiert. Coseismic and postseismic elastic wave velocity variations caused by the Iwate-Miyagi Nairiku earthquake, Japan. Und gibt es Lapalingo Erfahrung Wissensbereiche, in denen Sie nur sehr wenig Ahnung haben? Hobiger "Meine Themen" nutzen zu können müssen Sie der Datenspeicherung zustimmen. Beste Spielothek in GrГјnenbaindt finden wave ellipticity estimation from ambient seismic noise using single and multiple multi-sensor techniques. Bard, P. Sie haben Benachrichtigungen in Ihrem Browser blockiert. Titel: "Polarization of surface waves: Characterization, inversion and application to seismic hazard assessment". Die Quizbegeisterung war schon vorher da, aber danach hat mich auch der Ehrgeiz Wild West Online Deutsch und ich Beste Spielothek in Krohn finden begonnen, an Wettbewerben teilzunehmen. Weitere Inhalte dieses Autors Hobiger. Wie kam es zu Ihrem Rollenwechsel? Corbinian Wildmeister.

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