Cockrell School of Engineering University of Texas at Austin
UT Aerospace Engineering and Engineering Mechanics Center for Space Research logo
Dr. Srinivas Bettadpur

Dr. Srinivas Bettadpur

Director,
Center for Space Research


GENERAL RESEARCH INTERESTS

Space Geodesy and Spaceflight Mechanics; Earth System Science from space.

CURRENT RESEARCH THRUSTS (December 2020)

Some are mature, others are nascent - all of these feature dynamics, modeling, estimation and interpretation...

  • Dynamics of the Earth system from satellite gravity measurements
    • Solve the challenges of mass flux estimation, validation and interpretation in near real-time
    • Use of the global, space-based methods to solving problems at the smallest regional scales
    • Best representation of gravity information for diverse Earth sciences & applications
    • What does this tell us about the dynamics of the Earth system?
  • Global Space Geodesy and Orbit Determination
    • Multi-technique mm-level positioning and global reference frames
    • Can we achieve the 1-mm precision orbits? How can we even tell?
  • Regional Applications of Global Methods
    • Using remote sensing for understanding the water cycle in Texas and northern Mexico
    • A Gulf of Mexico reference frame for natural (inundation) hazards
  • How do we apply tomorrow's technologies for space-based gravity & Earth system science?
    • Use of laser interferometry, cold-atom technologies, precise clocks, drag-free flight, etc...

ACTIVE RESEARCH PROJECTS

GRACE Follow-On (https://gracefo.jpl.nasa.gov/) - The NASA/GFZ GRACE-FO mission launched on May 22, 2018. We are now focused on research into the estimation of Earth gravity models from GRACE-FO microwave and laser-ranging interferometer data; assessing its quality and continuity with respect to the 15-year data record from GRACE-FO; and improvements of methods and models for Earth gravity field determination in near real time. An important component of this research is also the development and operation of the Global Flux eXploratory (GFX), where we run the MITgcm, forced by CFS/GDAS atmospheric fields to reproduce the non-tidal variations in the atmosphere and ocean, for real-time applications.

GRACE (http://www2.csr.utexas.edu/grace/) - The NASA/DLR GRACE mission ended in late 2017.

Cold-Atom Technology & Space Geodesy - This is funded through a SURP grant from JPL, for the development of science applications and space mission architecture for mass change measurement using cold atom interferometer techniques. We also continue to study of this technique for applications other than mass change measurement.

Terrestrial Reference Frames (TRF) and mm-Metrology at McDonald Observatory - This project is currently funded by the NGA (2020-22), studying scale instability in multi-technique reference frames, and related topics in fundamental science and metrological techniques for the TRF. The work started through a NASA-ROSES grant, which ended in Feb 2019, which looked at mm-precision laser metrology to aid the realization of next generation terrestrial reference frames. This research is associated with the establishment and growth of the McDonald Geodetic Observatory and affiliated research.

Following projects are now concluded, but my hope is that the accomplishments from these projects will lead to more interesting work in these areas in the future.

GSFC/Drought & Flood - This collaboration with Matt Rodell (Hydrological Sciences Branch at GSFC) deals with the use of GRACE and GRACE-FO data with the lowest possible latency, tuned for North American flood and drought applications.

Water Cycle in Texas & Northern Mexico - In collaboration with MAGIC group at (UTCSR), we are expanding research into the joint use of GRACE/GRACE-FO, NDVI (from MODIS), precipitation and other available remote sensing resources for the characterization and understanding of the water cycle in Texas and Northern Mexico. A post-doc joined in 2016 and is helping us take this to the next phase of expansion.

Bangladesh & GRACE - This collaboration with colleagues at LDEO (Columbia University) is completed, and led to us testing the smallest spatio-temporal resolutions to which water loads could be meaningfully extracted from the GRACE data.

Drag-Free Systems for Satellite Gravity - A collaboration with colleagues at JPL, this project is wrapping up a study on the specification of requirements for a drag-free system for next generation gravity field measurement missions. The outcomes should inform future space mission design studies.

OGMOC - With this collaboration with TU-Munich and DTU, lasting through mid-2017, we looked at optimal combination of GRACE and GOCE data for the purpose of obtaining the best estimates of geostrophic ocean currents using satellite altimetry and the geoid.