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Papers by Christoph Reigber
Eos, Transactions American Geophysical Union, 1998
A major geodynamic study has provided significant new information about the location of active pl... more A major geodynamic study has provided significant new information about the location of active plate boundaries in and around Southeast Asia, as well as deformation processes in the Sulawesi region of Indonesia and tectonic activity in the Philippine archipelago. Results also have confirmed the existence of the so-called Sunda Block, which appears to be rotating with respect to adjacent plates.The
Lecture Notes in Earth Sciences, 1989
Manifestations of such forces and processes which are derivable from near Earth satellite observa... more Manifestations of such forces and processes which are derivable from near Earth satellite observations are irregular variations in the orientation of the Earth in space (including both changes of the direction of the rotation axis and variations in the rotational speed), vertical and horizontal ...
Geophysical Research Letters, 1996
The passive laser satellite GFZ‐1 (215 mm diameter, 21 kg mass, 60 retroreflectors) is orbiting t... more The passive laser satellite GFZ‐1 (215 mm diameter, 21 kg mass, 60 retroreflectors) is orbiting the Earth since April 1995. GFZ‐1 was placed in a circular, medium‐inclination orbit with an initial altitude of 390 km, the lowest ever flown for a geodetic satellite. GFZ‐1 is ...
International Association of Geodesy Symposia, 2000
The paper discusses various scientific/technical issues as network distribution, requirements for... more The paper discusses various scientific/technical issues as network distribution, requirements for autonomous and permanently operating GPS stations, near real time data transfer and operational requirements and data flow for a GPS ground station network being currently installed in preparation of the CHAMP mission.
The German geoscience satellite CHAMP was launched more than two years ago on July 15, 2000 into ... more The German geoscience satellite CHAMP was launched more than two years ago on July 15, 2000 into a quasi polar circular orbit at 450 km altitude. One of the mission goals is to better map the gravity field of the Earth through GPS/CHAMP satellite- to-satellite tracking data and on-board STAR accelerometer data. The GPS SST data provide almost continuous informat
The restitution of the CHAMP orbit during launch and early orbit phase in a fast and reliable man... more The restitution of the CHAMP orbit during launch and early orbit phase in a fast and reliable manner was only possible on the basis of data from two microwave tracking systems: the skin radar tracking and the high-low GPS-CHAMP SST tracking, not yet calibrated. Soon SLR tracking joined in and the on-board GPS data could be calibrated in the following weeks with the help of the SLR data. Nowadays, during the operational phase, SLR data are used to evaluate the precise orbit recovery before solving for the gravity field and to assess the quality of the solution. Based primarily on CHAMP observations, a new class of gravity field models can be computed. The EIGEN-1S and the EIGEN-2 models are published, both showing an order of magnitude accuracy improvement in comparison to former global gravity models from space. As such the long wavelength geoid becomes recoverable from just a few months of CHAMP data only and, by this, temporal variations of the geoid will become detectable by evaluating the full mission time span.
Sterne und Weltraum
ABSTRACT
The radio holography methodology may be applied in the scientific programs for future small satel... more The radio holography methodology may be applied in the scientific programs for future small satellite that will use radio signals emitted by radio navigation, radio communication satellites for precise measuring effects of radio waves propagation at low elevation angles and for global monitoring of radio communication channels passed through the atmosphere and ionosphere. Another task consists in monitoring of the wave phenomena in the atmosphere and ionosphere which may be important for telecommunication conditions in the difficult accessible regions (communications with air-planes in polar and sea zones, at small elevation angles, communications through the ionosphere between two satellites). Radio holography has been shown to provide a high angular and vertical resolution corresponding to high precision level of radio navigational radio field. For example, a weak signal reflected from the surface of the sea has been observed. As the second example a radio hologram of the ionospheric D-layer is considered. Wave structures in the concentration of the plasma with a vertical spatial period of 0.5-5 km, and variations in the electron density gradient from ±5⋅ 10 3 to ±8⋅ 10 3 electrons/(cm 3 km), were retrieved from analysis of the radio hologram. The features in the vertical profile of the gradient of electron density may be connected with the breaking of gravity waves in the temperature inversion region at the heights 70 -80 km. Radio holography shows its effectiveness for precise measuring effects of radio wave propagation and monitoring radio channels in the ionosphere and troposphere.
Title: Further evaluation of the GRIM 2 earth gravity field model. ... Origin: STI. NASA/STI Keyw... more Title: Further evaluation of the GRIM 2 earth gravity field model. ... Origin: STI. NASA/STI Keywords: ASTRONOMICAL MODELS, EARTH GRAVITATION, GEODETIC SATELLITES, GEOIDS, GEOPOTENTIAL, GRAVIMETRY, SATELLITE TRACKING, DEEP SPACE NETWORK, GEOS ...
13 different arcs of the satellites GEOS 2, BE-C, D1-D, and Anna 1b, which are in shallow resonan... more 13 different arcs of the satellites GEOS 2, BE-C, D1-D, and Anna 1b, which are in shallow resonance with the 13th-order harmonics in the geopotential were used for an analysis of the long period changes in the mean longitude in the sense of a boundary value problem. By this analysis 47 condition equations for even and odd degree harmonics of order 13 were derived.
The variation in the mean longitude for six satellites GEOS 2, BE-C, D1-D, Anna 1b, Oscar 07, and... more The variation in the mean longitude for six satellites GEOS 2, BE-C, D1-D, Anna 1b, Oscar 07, and Thor Able Star in stable near-resonant orbits have been analyzed to derive 35 condition equations for even and odd degree harmonics of order 13 in the geopotential. From each satellite the amplitude spectrum of the resonance effect was obtained and a set of 35 condition equations was derived for the 13th-order harmonics. These equations have been solved by least squares calculation for an increasing number of unknowns. The recommended solution, going up to 30 is given. In addition, the normal equations of this solution were combined to all derived normal equation subsystems in the global solution in order to strengthen the 13th-order coefficients determination.
Eos, Transactions American Geophysical Union, 1998
A major geodynamic study has provided significant new information about the location of active pl... more A major geodynamic study has provided significant new information about the location of active plate boundaries in and around Southeast Asia, as well as deformation processes in the Sulawesi region of Indonesia and tectonic activity in the Philippine archipelago. Results also have confirmed the existence of the so-called Sunda Block, which appears to be rotating with respect to adjacent plates.The
Lecture Notes in Earth Sciences, 1989
Manifestations of such forces and processes which are derivable from near Earth satellite observa... more Manifestations of such forces and processes which are derivable from near Earth satellite observations are irregular variations in the orientation of the Earth in space (including both changes of the direction of the rotation axis and variations in the rotational speed), vertical and horizontal ...
Geophysical Research Letters, 1996
The passive laser satellite GFZ‐1 (215 mm diameter, 21 kg mass, 60 retroreflectors) is orbiting t... more The passive laser satellite GFZ‐1 (215 mm diameter, 21 kg mass, 60 retroreflectors) is orbiting the Earth since April 1995. GFZ‐1 was placed in a circular, medium‐inclination orbit with an initial altitude of 390 km, the lowest ever flown for a geodetic satellite. GFZ‐1 is ...
International Association of Geodesy Symposia, 2000
The paper discusses various scientific/technical issues as network distribution, requirements for... more The paper discusses various scientific/technical issues as network distribution, requirements for autonomous and permanently operating GPS stations, near real time data transfer and operational requirements and data flow for a GPS ground station network being currently installed in preparation of the CHAMP mission.
The German geoscience satellite CHAMP was launched more than two years ago on July 15, 2000 into ... more The German geoscience satellite CHAMP was launched more than two years ago on July 15, 2000 into a quasi polar circular orbit at 450 km altitude. One of the mission goals is to better map the gravity field of the Earth through GPS/CHAMP satellite- to-satellite tracking data and on-board STAR accelerometer data. The GPS SST data provide almost continuous informat
The restitution of the CHAMP orbit during launch and early orbit phase in a fast and reliable man... more The restitution of the CHAMP orbit during launch and early orbit phase in a fast and reliable manner was only possible on the basis of data from two microwave tracking systems: the skin radar tracking and the high-low GPS-CHAMP SST tracking, not yet calibrated. Soon SLR tracking joined in and the on-board GPS data could be calibrated in the following weeks with the help of the SLR data. Nowadays, during the operational phase, SLR data are used to evaluate the precise orbit recovery before solving for the gravity field and to assess the quality of the solution. Based primarily on CHAMP observations, a new class of gravity field models can be computed. The EIGEN-1S and the EIGEN-2 models are published, both showing an order of magnitude accuracy improvement in comparison to former global gravity models from space. As such the long wavelength geoid becomes recoverable from just a few months of CHAMP data only and, by this, temporal variations of the geoid will become detectable by evaluating the full mission time span.
Sterne und Weltraum
ABSTRACT
The radio holography methodology may be applied in the scientific programs for future small satel... more The radio holography methodology may be applied in the scientific programs for future small satellite that will use radio signals emitted by radio navigation, radio communication satellites for precise measuring effects of radio waves propagation at low elevation angles and for global monitoring of radio communication channels passed through the atmosphere and ionosphere. Another task consists in monitoring of the wave phenomena in the atmosphere and ionosphere which may be important for telecommunication conditions in the difficult accessible regions (communications with air-planes in polar and sea zones, at small elevation angles, communications through the ionosphere between two satellites). Radio holography has been shown to provide a high angular and vertical resolution corresponding to high precision level of radio navigational radio field. For example, a weak signal reflected from the surface of the sea has been observed. As the second example a radio hologram of the ionospheric D-layer is considered. Wave structures in the concentration of the plasma with a vertical spatial period of 0.5-5 km, and variations in the electron density gradient from ±5⋅ 10 3 to ±8⋅ 10 3 electrons/(cm 3 km), were retrieved from analysis of the radio hologram. The features in the vertical profile of the gradient of electron density may be connected with the breaking of gravity waves in the temperature inversion region at the heights 70 -80 km. Radio holography shows its effectiveness for precise measuring effects of radio wave propagation and monitoring radio channels in the ionosphere and troposphere.
Title: Further evaluation of the GRIM 2 earth gravity field model. ... Origin: STI. NASA/STI Keyw... more Title: Further evaluation of the GRIM 2 earth gravity field model. ... Origin: STI. NASA/STI Keywords: ASTRONOMICAL MODELS, EARTH GRAVITATION, GEODETIC SATELLITES, GEOIDS, GEOPOTENTIAL, GRAVIMETRY, SATELLITE TRACKING, DEEP SPACE NETWORK, GEOS ...
13 different arcs of the satellites GEOS 2, BE-C, D1-D, and Anna 1b, which are in shallow resonan... more 13 different arcs of the satellites GEOS 2, BE-C, D1-D, and Anna 1b, which are in shallow resonance with the 13th-order harmonics in the geopotential were used for an analysis of the long period changes in the mean longitude in the sense of a boundary value problem. By this analysis 47 condition equations for even and odd degree harmonics of order 13 were derived.
The variation in the mean longitude for six satellites GEOS 2, BE-C, D1-D, Anna 1b, Oscar 07, and... more The variation in the mean longitude for six satellites GEOS 2, BE-C, D1-D, Anna 1b, Oscar 07, and Thor Able Star in stable near-resonant orbits have been analyzed to derive 35 condition equations for even and odd degree harmonics of order 13 in the geopotential. From each satellite the amplitude spectrum of the resonance effect was obtained and a set of 35 condition equations was derived for the 13th-order harmonics. These equations have been solved by least squares calculation for an increasing number of unknowns. The recommended solution, going up to 30 is given. In addition, the normal equations of this solution were combined to all derived normal equation subsystems in the global solution in order to strengthen the 13th-order coefficients determination.