A5062787933- Advanced Frequency and Time Standards
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Solar and Space Plasma Dynamics
- Geophysics and Sensor Technology
- Inertial Sensor and Navigation
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Radioactive Decay and Measurement Techniques
- Planetary Science and Exploration
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Gamma-ray bursts and supernovae
- earthquake and tectonic studies
- Astronomy and Astrophysical Research
Leibniz University Hannover
2020-2024
For over two decades, satellite gravimetry missions have been measuring the Earth’s gravity field globally providing valuable observations for geosciences. Successor are already in development to extend this time series. Future objectives include achieving higher spatial and temporal resolutions of products as well enhancing measurement accuracy, currently constraint by, among other aspects, instrument performances. While some adaptations made or foreseen upcoming MAGIC...
Recent advances in cold atom interferometry have cleared the path for space applications of quantum inertial sensors, whose level stability is expected to increase dramatically with longer interrogation times accessible space. In this study, an in-orbit model developed a Mach-Zehnder-type cold-atom accelerometer. Performance tests are realized under different assumptions about positioning and rotation compensation method, impact various sources errors on instrument evaluated. Current future...
Accelerometers are an essential component of satellite gravimetry missions, as the non-gravitational forces acting on satellites must be known in order to determine Earth's gravity field. However, accelerometers currently use one limiting factors regarding accuracy determined field, which opens up room for improvement. Among other techniques, quantum-based promising candidates applied future. In achieve required technology readiness level operation space, a pathfinder mission is planned...
Satellite gravity missions are a powerful tool to measure the global Earth’s field and consequently provide important information for geosciences. However, improvements in spatial temporal resolution required many applications. Simulation studies performed quantify influence of improved sensors, orbit parameters measurement concepts on recovered solution. The investigations focus primarily accelerometers by evaluating concept Cold Atom Interferometry (CAI) their combination with...
Cold atom interferometry (CAI)-based quantum accelerometers are very promising for future satellite gravity missions thanks to their strength in providing long-term stable and precise measurements of non-gravitational accelerations. However, limitations due the low measurement rate existence ambiguities raw sensor call hybridization accelerometer (Q-ACC) with a classical one (e.g., electrostatic) higher bandwidth. While previous studies have so far considered simple noise models Q-ACC...
<div> <p>Satellite gravimetry missions like GRACE and now GRACE-FO measure the global gravity field its variations in time. Gravity solutions are typically estimated monthly, but a higher accuracy better temporal resolution is required for various applications geosciences. With addition of laser ranging interferometer (LRI) to GRACE-FO, significant improvement over concerning inter-satellite was achieved. The determination non-gravitational forces acting on...
A big interest exists in geoscience disciplines to know the mass variations of Earth with high resolution and accuracy. For monitoring climate change processes at required level, it is essential select appropriate sensor technology satellite missions. Future missions will strongly depend on advancement novel dedicated observation concepts Earth's gravitational field.The first objective this study characterize various quantum hybrid gradiometer describe their respective error properties. As a...
<p>In the past three decades, optical clocks and frequency transfer techniques have experienced a rapid development. They are approaching fractional uncertainty of 1.0x10<sup>-18</sup>, corresponding to about 1.0 cm in height. This makes them promising realize “relativistic geodesy”, it opens new door directly obtain gravity potential values by comparison clock frequencies. Clocks thus considered as novel candidate for...
<p>Satellite gravity missions, like GRACE and Follow-On, successfully map the Earth’s field its changes, but boundaries of spatial temporal resolution need to be pushed further. The major enhancement from GRACE-FO is laser interferometry instrument which enables a much more accurate inter-satellite ranging. However, accelerometers used for observing non-conservative forces have merely been improved are one limiting factor recovery. Inertial sensors based on cold...