Other
Scientific paper
Dec 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967saosr.264.....l&link_type=abstract
SAO Special Report #264 (1967)
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1
Scientific paper
This report gives the results at SAO from Geos 1 data and summarizes the SAO contributions to the geodetic satellite programs as of the end of 1967, just before the initiation of a major solution for geodetic parameters, later published as Special Report 315. (1) Evolution and Integration of Geodetic Research at SAO, by C. A. Lundquist. This paper offers a brief account of geodetic studies at SAO and summarizes the papers that follow. (2) Interstation Connections from Geos 1 Optical Beacon Observations, by J. Rolff. SAO has incorporated Geos 1 optical beacon observations from other agencies into its scientific programs. Useful observations were produced by five stations in Europe. The accuracy of these observations is very promising, but more data are needed before definite results in interstation connections can be established. (3) Dynamical Determination of Station Locations Using Geos 1 Data, by E. M. Gaposchkin. The geodetic satellite Geos 1 is used to determine the location of the observing sites for the Goddard Range and Range Rate system, the Navy TRANET Doppler system, and some cooperating optical observatories. Geos 1 orbits are determined, one per month, for the first 10 months of the satellite. The coordinates are calculated by the dynamical method and are expressed in the C6 system of SAO. Directions determined from simultaneous observations are used to verify some results. The coordinates are suitable for use as an initial set for a more comprehensive global solution using many satellites. The success of the study indicates that such a combination is indeed possible and desirable. (4) Improved Values for Coefficients of Zonal Spherical Harmonics in the Geopotential, by Y. Kozai. Coefficients of zonal spherical harmonics up to the 20th order in the expression of the gravitational potential of the earth are derived from precisely reduced Baker-Nunn observations for 10 artificial satellites with inclinations between 28° and 96° (5) The Earth's Gravitational Field as Derived from a Combination of Satellite Data with Gravity Anomalies, by W. Köhnlein. The Harmonic coefficients of the Earth's Gravitational field are determined from a joint analysis of satellite gravity data with free-air gravity anomalies. The zonal coefficients are considered up to degree 20, whereas the nonzonal coefficients are fully determined up to 15, 15. The results are shown in geoid and gravity contour maps. (6) The Determination of the Radius of the Earth and Other Geodetic Parameters as Derived from Optical Satellite Data, by G. Veis. The availability of new geodetic data, together with some laser ranging to satellites and recent determinations of the value of GM, has made possible a new, highly accurate estimate of the semimajor axis of the earth's ellipsoid, based on the results of the 1966 Smithsonian Institution Standard Earth. At the same time, a number of other geometric parameters have also been determined, giving a consistent set of parameters that define the geometric and dynamic properties of the earth. (7) Jupiter, Florida, Intercomparison Experiment, by E. Horine, J. Latimer, D. LeConte, and M. Wolf. The instrumentation and operational procedures used in the photography of Geos 1 flashes by the Baker-Nunn and K-50 Geodetic cameras at Jupiter, Florida, during the intercomparison experiment in 1966 are described. The six other optical systems participating in the test are summarized. Joint-observational data of the Baker-Nunn and K-50 geodetic cameras are analyzed. (8) Data Preparation and Evaluation for Geos 1 Tracking Systems, by L. H. Solomon. The preparation and use of data from the various tracking systems, particularly electronic systems, carried on Geos 1 are investigated. The data have been converted into a format usable at SAO, the relative accuracies of the several tracking systems have been studied, and the various data have been tested together in determining orbits and station coordinates. (9) Reduction and Accuracy of Baker-Nunn Observations of Geos 1, by K. Lambeck and L. J. McGrath, Jr. The techniques employed in the reduction of Baker-Nunn observations of Geos are briefly discussed. An accuracy study of the observation has been carrried out, and a summary of the results, as applicable to Geos observations, is presented. (10) Geos 1 Orbital Elements and Observations, by B. R. Miller and P. J. Caliri. The first section of this paper lists the mean orbital elements of Goes 1 derived by use of precisely reduced observations of Geos 1 and SAO Differential Orbit Improvement program, written for the CDC 6400 computer. The precisely reduced observations of Geos 1, presented in the second section, are a combination of passive, flash, and range observations taken by the Baker-Nunn cameras, the SAO K-50 cameras, and the SAO laser at Organ Pass, New Mexico. (11) Long-Arc Orbital Analysis of Geos 1, by E. M. Gapsochkin and P. D. Hubley. Numerical results of orbits computed for 30-day arcs presented. It has been found that such orbits are sufficiently accurate to use for geodetic purposes. (Appendix. Compendium of Satellite-Tracking Station Coordinates.)
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