Henry Wegener
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View article: Re-analysing the data processing of the K-band ranging system on GRACE Follow-On
Re-analysing the data processing of the K-band ranging system on GRACE Follow-On Open
The K-Band Ranging System (KBR) is the key payload for measuring inter-satellite distance variations with micrometer accuracy on the GRACE and GRACE Follow-On (GRACE-FO) missions. Alongside KBR, GRACE-FO includes a novel and more precise L…
View article: Triple mirror assembly in the GRACE Follow-On laser ranging interferometer
Triple mirror assembly in the GRACE Follow-On laser ranging interferometer Open
The Gravity Recovery And Climate Experiment (GRACE) Follow-On mission was launched on May 22, 2018, to continue monitoring changes in the gravity field of the Earth by measuring distance variations between two spacecraft that fly 200 km ap…
View article: Design of Dedicated Tilt-to-Length Calibration Maneuvers for LISA
Design of Dedicated Tilt-to-Length Calibration Maneuvers for LISA Open
Tilts of certain elements within a laser interferometer can undesirably couple into measurements as a form of noise, known as tilt-to-length (TTL) coupling. This TTL coupling is anticipated to be one of the primary noise sources in the Las…
View article: In-depth modeling of tilt-to-length coupling in LISA’s interferometers and TDI Michelson observables
In-depth modeling of tilt-to-length coupling in LISA’s interferometers and TDI Michelson observables Open
We present first-order models for tilt-to-length (TTL) coupling in Laser Interferometer Space Antenna (LISA), both for the individual interferometers, as well as in the time-delay interferometry (TDI) Michelson observables. These models in…
View article: In-Depth Modeling of Tilt-To-Length Coupling in LISA's Interferometers and TDI Michelson Observables
In-Depth Modeling of Tilt-To-Length Coupling in LISA's Interferometers and TDI Michelson Observables Open
We present first-order models for tilt-to-length (TTL) coupling in LISA, both for the individual interferometers as well as in the time-delay interferometry (TDI) Michelson observables. These models include the noise contributions from ang…
View article: Scale Factor Determination for the GRACE Follow-On Laser Ranging Interferometer Including Thermal Coupling
Scale Factor Determination for the GRACE Follow-On Laser Ranging Interferometer Including Thermal Coupling Open
The GRACE follow-on satellites carry the very first interspacecraft Laser Ranging Interferometer (LRI). After more than four years in orbit, the LRI outperforms the sensitivity of the conventional Microwave Instrument (MWI). However, in th…
View article: Laser Ranging Interferometer Status
Laser Ranging Interferometer Status Open
<p>The current status of the LRI instrument will be presented. Topics will include a look at in-orbit LRI data following a firmware update in September 2022.</p>
View article: Reprocessing of KBR1B data on GRACE-FO and its advantages
Reprocessing of KBR1B data on GRACE-FO and its advantages Open
<p><span lang="en-US">The K-Band Ranging system (KBR) is the key payload to measure the inter-satellite distance variations with the accuracy of sub-micrometers in GRACE and its successor GRACE-FO missions. In additio…
View article: New Versions of the AEI-derived LRI1B dataset
New Versions of the AEI-derived LRI1B dataset Open
<p>The inter-satellite distance changes of the GRACE Follow-On spacecraft are measured by the main science instrument, the K-Band Ranging (KBR) system, and by the new Laser Ranging Interferometer (LRI), which exhibits a higher precis…
View article: Comparing GRACE-FO KBR and LRI Ranging Data with Focus on Carrier Frequency Variations
Comparing GRACE-FO KBR and LRI Ranging Data with Focus on Carrier Frequency Variations Open
The GRACE Follow-On satellite mission measures distance variations between its two satellites in order to derive monthly gravity field maps, indicating mass variability on Earth on a scale of a few 100 km originating from hydrology, seismo…
View article: Scale Factor Determination for the GRACE-Follow On Laser Ranging Interferometer including Thermal Coupling
Scale Factor Determination for the GRACE-Follow On Laser Ranging Interferometer including Thermal Coupling Open
The GRACE Follow-On satellites carry the very first inter-spacecraft Laser Ranging Interferometer (LRI). After more than four years in orbit, the LRI outperforms the sensitivity of the conventional Microwave Instrument (MWI). However, in t…
View article: Comparing GRACE-FO KBR and LRI ranging data with focus on carrier frequency variations
Comparing GRACE-FO KBR and LRI ranging data with focus on carrier frequency variations Open
The GRACE Follow-On satellite mission measures distance variations between the two satellites in order to derive monthly gravity field maps, indicating mass variability on Earth on a few 100 km scale due to hydrology, seismology, climatolo…
View article: Laser Ranging Interferometers in GRACE-FO and for NGGM - Status
Laser Ranging Interferometers in GRACE-FO and for NGGM - Status Open
<p>The Laser Ranging Interferometer (LRI) onboard the GRACE Follow-On mission is operational for almost four years. It provides high-quality ranging data with a noise below 1 nm/&#8730;Hz at Fourier frequencies around 1 Hz, as we…
View article: Derivation of an alternative GRACE Follow-On LRI1B data product
Derivation of an alternative GRACE Follow-On LRI1B data product Open
<p>The Gravity Recovery and Climate Experiment (GRACE) was a space mission from 2002-2017. While the two identical satellites were orbiting the Earth one after the other, the inter-satellite distance variations caused by the Earth's …
View article: Laser Ranging Interferometer on GRACE Follow-On: Current Status
Laser Ranging Interferometer on GRACE Follow-On: Current Status Open
<p>The GRACE Follow-On satellites were launched <span>on</span> <span>22</span>nd May <span>2018</span> <span>to</span> <span>continue</span> the measurement of Earth&#8…
View article: Thermal Influence on the LRI Scale Factor
Thermal Influence on the LRI Scale Factor Open
<p>In this talk we present the current status of our investigations regarding variations of the LRI scale factor with spotlight on the thermal environment of the LRI. Furthermore, we describe an alternative derivation of the scale fa…
View article: Coupling of Pointing Angles and Angular Rates in the GRACE Follow-On Laser Ranging Interferometer
Coupling of Pointing Angles and Angular Rates in the GRACE Follow-On Laser Ranging Interferometer Open
<p>The Laser Ranging Interferometer (LRI) of the GRACE Follow-On (GFO) mission has successfully shown its capability of continuously measuring the inter-satellite biased range with higher precision than the established microwave rang…
View article: An alternative derivation of the GRACE Follow-On LRI1B product: current status
An alternative derivation of the GRACE Follow-On LRI1B product: current status Open
<p align="justify"><span lang="en-GB">The new Laser Ranging Interferometer (LRI) on GRACE Follow-On is measuring, just like the microwave instrument (MWI), the distance variations between the two satellites,…
View article: Scale Factor of the Laser Ranging Interferometer in GRACE Follow-On
Scale Factor of the Laser Ranging Interferometer in GRACE Follow-On Open
<p>The Laser Ranging Interferometer onboard GRACE-FO is a novel instrument, that measures&#160; the inter-spacecraft distance up to nanometer precision with high reliability. An important quantity for this precise measurement is …
View article: Tilt-to-Length Coupling in the GRACE Follow-On Laser Ranging Interferometer
Tilt-to-Length Coupling in the GRACE Follow-On Laser Ranging Interferometer Open
The Laser Ranging Interferometer onboard the Gravity Recovery and Climate Experiment Follow-On satellites is the first laser interferometer in space measuring satellite-to-satellite distance variations. One of its main noise sources at low…
View article: In-Orbit Performance of the GRACE Follow-on Laser Ranging Interferometer
In-Orbit Performance of the GRACE Follow-on Laser Ranging Interferometer Open
The Laser Ranging Interferometer (LRI) instrument on the Gravity Recovery and Climate Experiment (GRACE) Follow-On mission has provided the first laser interferometric range measurements between remote spacecraft, separated by approximatel…
View article: Towards a tilt-to-length coupling calibration on the GRACE follow-on laser ranging instrument
Towards a tilt-to-length coupling calibration on the GRACE follow-on laser ranging instrument Open
The Laser Ranging Instrument (LRI) measures the biased range between the two GRACE Follow-On spacecraft (launched in May 2018) using laser interferometry. It is the first of its type and serves as a technology demonstrator. Here we present…
View article: Towards a tilt-to-length coupling calibration on the grace follow-on laser ranging instrument
Towards a tilt-to-length coupling calibration on the grace follow-on laser ranging instrument Open
The Laser Ranging Instrument (LRI) measures the biased range between the two GRACE Follow-On spacecraft (launched in May 2018) using laser interferometry. It is the first of its type and serves as a technology demonstrator. Here we present…
View article: Instrument data simulations for GRACE Follow-on: observation and noise models
Instrument data simulations for GRACE Follow-on: observation and noise models Open
The Gravity Recovery and Climate Experiment (GRACE) mission has yielded data on the Earth's gravity field to monitor temporal changes for more than 15 years. The GRACE twin satellites use microwave ranging with micrometre precision to meas…
View article: Instrument Data Simulations for GRACE Follow-on: Observationand Noise Models
Instrument Data Simulations for GRACE Follow-on: Observationand Noise Models Open
The Gravity Recovery and Climate Experiment (GRACE) mission has yielded data on the Earth's gravity field to monitor temporal changes for more than fifteen years now. The GRACE twin satellites use microwave ranging with micrometer precisio…
View article: Basic Mock Data Challenge 1
Basic Mock Data Challenge 1 Open
The data are the results of a pure dynamic orbit integration, in which only a static Earth’s gravity field model is taken as the force model. Hence other disturbing forces such as tides, drag, solar radiation pressure etc. are not included…