Space Science Reviews

, Volume 108, Issue 1–2, pp 385–392 | Cite as

Possible Future Use of Laser Gravity Gradiometers

  • P. L. Bender
  • R. S. Nerem
  • J. M. Wahr


With the GRACE mission under way and the GOCE mission well along in the design process, detailed questions concerning the type of future mission that may follow them have arisen. It is generally agreed that determining the time variations in the Earth's gravity field with as high spatial and temporal resolution as is feasible will be the main driver for such a mission. The possible use of laser heterodyne measurements between separate satellites in such a mission has been discussed by a number of people. The first suggestion of emphasizing time variation measurements in a laser mission was the TIDES concept presented in 1992 by Colombo and Chao. Then, in 2000, a GRACE Follow-On mission using laser measurements between two drag-free satellites was discussed by Watkins el al. (2000).

More recently, the possibility of utilizing laser measurements between more than two satellites in order to determine two or more components of the gravity gradient tensor simultaneously has been proposed by Balmino. This approach may be desirable in order to reduce the aliasing of time variations between geopotential terms of different degree and order, as well as to improve the resolution in longitude, despite the cost of the additional satellites. In this paper, we discuss specific possible mission geometries for measuring the two diagonal in-plane components of the gravity gradient tensor simultaneously. This could be done, for example, by laser heterodyne measurements between two pairs of satellites in coplanar and nearly polar orbits.


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  1. Balmino, G.: 2002, private communication.Google Scholar
  2. Bender, P. L.: 1985, ‘Laser Doppler experiment option for a 200–250 km altitude,’ Geopotential Research Mission (abstract), EOS, Trans. Amer. Geophys. Union 66, 242.Google Scholar
  3. Bender, P.L.: 1992, ‘Integrated laser Doppler method for measuring planetary gravity fields,’ in From Mars to Greenland: Charting Gravity With Space and Airborne Instruments, IAG Symposium No. 110, Springer-Verlag, 63-72.Google Scholar
  4. Bender, P.L., Hall, J. L., Ye, J., and Klipstein, W. M.: 2002, ‘Satellite-satellite laser links for future gravity missions,’ in Space Sci. Rev., this volume.Google Scholar
  5. Breakwell, J. V.: 1979, ‘Satellite determination of short wavelength gravity variations,’ J. Astronaut. Sci. 27, 329-344.MathSciNetGoogle Scholar
  6. Colombo, O. L. and Chao, B. F.: 1992, ‘Global gravitational change from space in 2001,’ IAG Symp. 112, Potsdam.Google Scholar
  7. De Bra, D. B.: 1998, ‘Design considerations for drag free satellites,’ in Laser Interferometer Space Antenna, Amer. Inst. Phys. Conf. Proc. 456, W. M. Folkner, Ed., AIP, Woodbury, N.Y., 199-206.Google Scholar
  8. Folkner, W. M.: 1995, private communication.Google Scholar
  9. Folkner, W. M., Hechler, F., Sweetser, T. H., Vincent, M. A., and Bender, P. L.: 1997, ‘LISA orbit selection and stability,’ Class. & Quantum Grav. 14, 1405-1410.CrossRefADSGoogle Scholar
  10. Jennrich, O., Stebbins, R. T., Bender, P. L., and Pollack, S.: 2001, ‘Demonstration of the LISA phase measurement principle,’ Class. & Quantum Grav. 18, 4159-4164.MATHCrossRefADSGoogle Scholar
  11. Lange, B.: 2001, ‘Managing spherical proof masses in drag-free satellites with application to the LISA experiment,’ Class. & Quantum Grav. 18, 4153-4158.MATHCrossRefADSGoogle Scholar
  12. Lange, B.: 2002, ‘Drag-free performance in a LISA mission with spherical proof masses,’ Class. & Quantum Grav. 19, 1739-1743.CrossRefADSGoogle Scholar
  13. LISA Study Team: 2000, ‘LISA Laser Interferometer Space Antenna: a Cornerstone Mission for the Observation of Gravitational Waves,’ ESA-SCI(2000)11, European Space Agency.Google Scholar
  14. MBB: 1978, ‘SLALOM Mission/System Definition — Final Report,’ European Space Agency Contract No. 3483/78/F/DK(SC), Messerschmitt-Boelkow-Blohm GMBH, Ottobrunn/Muenchen.Google Scholar
  15. Schumaker, B. L.: 1990, ‘Scientific Applications of Frequency-Stabilized Laser Technology in Space,’ Jet Propulsion Laboratory Pub. 90-50, Caltech, Pasadena, CA, pp. 133-146.Google Scholar
  16. Thompson, P. F., Bettadpur, S. V., Kim, J., and Watkins, M. M.: 2000, ‘Short period time variations in the gravity field and their impact on GRACE science,’ Trans. of the AGU (EOS),81, F310.Google Scholar
  17. Watkins, M. M., Folkner, W. M., Chao, B., and Tapley, B. D.: 2000, ‘EX-5: A laser interferometer follow-on to the GRACE mission,’ presented at GGG2000, Banff, Canada, 31 July–5 August, 2000 (unpublished).Google Scholar

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • P. L. Bender
    • 1
  • R. S. Nerem
    • 2
  • J. M. Wahr
    • 3
  1. 1.JILA, National Institute of Standards and Technology and University of ColoradoBoulderUSA (
  2. 2.Colorado Center for Astrodynamics Research and Aerospace Engineering Sciences DepartmentUniversity of ColoradoBoulderUSA (
  3. 3.Cooperative Institute for Research in Environmental Sciences and Physics Department, University of ColoradoBoulderUSA (

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