Postdoctoral Researcher

The Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences is the national centre for research into the geosphere. With around 1,650 employees, we develop a sound understanding of systems and processes of the solid Earth as well as strategies and options for action to counter global change, understand natural hazards and sustainably secure energy and raw material requirements.

For section Section 1.2: Global Geomonitoring and Gravity Field, we are looking for a:
Postdoctoral researcher (f_m_x) for GENESIS-D project

**Reference Number 9895**:
Join us in an exciting opportunity to advance global space geodesy with cutting-edge technology

The primary goal of ESA’s GENESIS satellite mission is to significantly improve global geodetic reference frames. These serve as a foundation for precise positioning and Earth monitoring and are determined using four space geodetic techniques: DORIS (Doppler Orbitography and Radio positioning Integrated by Satellite), GNSS (Global Navigation Satellite Systems), SLR (Satellite Laser Ranging), and VLBI (Very Long Baseline Interferometry). The GENESIS satellite will enable linking all four techniques on a single satellite platform (“co-location in space”).

Currently, this combination is achieved by linking station coordinates using "local ties" at specific co-location sites and by determining Earth Orientation Parameters as "global ties". However, the innovative GENESIS satellite will enable a new approach: linking all four techniques on a single satellite platform (“co-location in space”), offering a unique opportunity to achieve unprecedented precision and reliability.

Join a diverse and collaborative team. As a part of the GENESIS-D project, you will have the opportunity to lead realistic simulations using GFZ’s advanced EPOS (Earth Parameter and Orbit System) software for identifying and resolving systematic errors between the four techniques. Your work will help shaping the future of geodetic research by achieving the highest precision possible to support deriving a more accurate and stable TRF which meets the requirements of the Global Geodetic Observing System (GGOS).

**Your responsibilities**:

- **Calculation** of various orbits of the GENESIS mission which serve for simulation of systematic error-free observations of the four space geodetic techniques complemented by realistic noise model assumptions
- **Analyze and evaluate** real observations from existing ground and space segments, using them as valuable training data for the project’s simulations and contributing to a deeper understanding of the data
- **Create** reference solutions reflecting a realistic simulated current state of the ground and space segments, which is actually used for e.g. the determination of reference frames
- **Integrate** these reference solutions with simulated GENESIS scenarios to assess the impact of the GENESIS mission on a single technology or in combinations of up to all four techniques
- **Investigate the influence** of various systematic errors, such as disturbing forces or space tie errors, on orbit determination and the resulting reference frames, to develop strategies for enhancing the mission’s accuracy and stability
- **Collaborate** with colleagues in the GENESIS-D project group and contribute to the IAG (International Association of Geodesy) GENESIS working group on behalf of GFZ Potsdam

**Your qualifications**:

- **University degree (Master, Diplom or equivalent)** in geodesy, space engineering, astronomy or a related discipline
- **In depth experience with orbit determination** as well as simulation, combination and real data** analysis of space geodetic data** DORIS, GNSS, SLR and VLBI for improving TRFs, either proven by PhD topic, research projects or publications
- Familiarity with **geodetic reference frames** and knowledge of **current developments** in the field
- Strong proficiency **in least squares adjustment **(observation level) and** linear algebra** (normal equation level)
- Hands-on experience with** data processing in Linux environments** and **shell scripting.**:

- Proficiency in **programming languages** such as MATLAB, FORTRAN, C++, C#, SQL, Python, scientific programming and HPC
- Good **command of English** (written and spoken)
- **Ability to work independently**, paired with a proactive mindset
- **Strong team skills **and a willingness to **engage in a multidisciplinary team** environment, actively collaborating with internal and external partners

**Start date**: As soon as possible
**Fixed-term**:30.09.2027, with possibility of extension
**Salary**: The salary group is determined on the basis of the Collective Wage Agreement and the respective personal qualifications and may be classed up to salary group 13 according to “TVöD Bund (Tarifgebiet West)”
**Working hours**: Vollzeit (derzeit 39 h/Woche)
**Place of work**: Oberpfaffenhofen

**What we offer**:

- Ambitious and varied tasks in a dynamic and inte