Letter | Published:

Comparison of Earth rotation as inferred from radio interferometric, laser ranging and astrometric observations

Naturevolume 302pages509511 (1983) | Download Citation

Subjects

Abstract

New techniques are being developed to improve the spatial and temporal resolutions achievable in measurements of the rotation vector of the Earth. Such improvements are expected to expose fine details of this rotation and to aid in understanding their physical causes. Although not yet fully developed, two of these techniques are now in routine use: radio interferometry and laser ranging. In the former technique, antennas up to thousands of kilometres apart are used to observe compact extragalactic radio sources. The differences in arrival time of the signals propagating from each source to the antennas, measured by the method of very-long-baseline interferometry (VLBI), are sensitive to variations in each of the components of the Earth's rotation vector. In the latter technique, lasers are used to measure the distance (range) to artificial Earth satellites (satellite laser ranging, SLR) and to optical retroreflectors on the Moon (lunar laser ranging, LLR). To assess the accuracy being achieved in the measurement of Earth rotation it is useful to compare results obtained with these different techniques. National programmes and international cooperation, exemplified by the International Astronomical Union/International Union of Geodesy and Geophysics project MERIT1,2, are encouraging the collection of data suitable for accurate intercomparisons. Here we compare results for a 400-day period from late September 1980 to December 1981, for which data from all three types of measurements are available. We also compare corresponding results from classical astrometric observations which demonstrate the degree of improvement in accuracy afforded by the new techniques.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Wilkins, G. A. & Feissel, M. (eds) Project MERIT: Report on the Short Campaign and Grasse Workshop with Observations and Results on Earth-Rotation During 1980 August–October (Royal Greenwich Observatory, Herstmonceux, 1982).

  2. 2

    Wilkins, G. A. (ed.) Project MERIT: A Review of the Techniques to be Used During Project MERIT to Monitor the Rotation of the Earth (Royal Greenwich Observatory, Herstmonceux, 1980).

  3. 3

    Robertson, D. S. & Carter, W. E. in High Precision Earth Rotation and Earth–Moon Dynamics (ed. Calame, O.) 97–122 (Reidel, Dordrecht, 1982).

  4. 4

    Tapley, B. D., Schutz, B. E. & Eanes, R. J. Proc. 4th IAG Laser Ranging Workshop, 523–567 (University of Texas, Austin, 1981).

  5. 5

    Schutz, B. E., Tapley, B. D. & Eanes, R. J. in A. Rep. 1980 D27–D36 (Bureau International de l'Heure, Paris, 1981).

  6. 6

    Langley, R. B., King, R. W., & Shapiro, I. I. J. geophys. Res. 86, 11913–11918 (1981).

  7. 7

    Langley, R. B., King, R. W., Morgan, P. J. & Shapiro, I. I. in High Precision Earth Rotation and Earth–Moon Dynamics (ed. Calame, O.) 25–30 (Reidel, Dordrecht, 1982).

  8. 8

    Feissel, M. in A. Rep. 1980, 1981 (Bureau International de l'Heure, Paris, 1981, 1982).

  9. 9

    A. Rep. 1981 (Bureau International de l'Heure, Paris, 1982).

Download references

Author information

Author notes

    • R. B. Langley

    Present address: Department of Surveying Engineering, University of New Brunswick, Frederiction, New Brunswick, Canada, E3B 5A3

    • I. I. Shapiro

    Present address: Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, 02138, USA

Affiliations

  1. National Geodetic Survey, National Ocean Service, NOAA, Rockville, Maryland, 20852, USA

    • D. S. Robertson
    •  & W. E. Carter
  2. Department of Aerospace Engineering and Engineering Mechanics, University of Texas at Austin, Austin, Texas, 78712, USA

    • R. J. Eanes
    • , B. E. Schutz
    •  & B. D. Tapley
  3. Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA

    • R. W. King
    • , R. B. Langley
    • , P. J. Morgan
    •  & I. I. Shapiro

Authors

  1. Search for D. S. Robertson in:

  2. Search for W. E. Carter in:

  3. Search for R. J. Eanes in:

  4. Search for B. E. Schutz in:

  5. Search for B. D. Tapley in:

  6. Search for R. W. King in:

  7. Search for R. B. Langley in:

  8. Search for P. J. Morgan in:

  9. Search for I. I. Shapiro in:

About this article

Publication history

Received

Accepted

Issue Date

DOI

https://doi.org/10.1038/302509a0

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.