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Resonant Perturbations of Existing Satellites (1968)

WAGNER, CARL A. ; DOUGLAS, BRUCE C.

[s.l.] : Nature Publishing Group

Nature 220 (1968), S. 898-899

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] The geopotential coefficients to (15, 15) used in the calculations are those reported by Kohnlein at the Fourteenth General Assembly of the International Union of Geodesy and Geophysics, October 1967. For terms with 15 〈20, the value suggested by Kaula1, Jim^ 0-07 x 10~6, was used. We did not ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/220898a0

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Error analyses of resonant orbits for geodesy (1969)

Douglas, Bruce C. ; Martin, Chreston F. ; Williamson, Ronald G. ; [et al.]

Springer

Celestial mechanics and dynamical astronomy 1 (1969), S. 252-270

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ISSN: 1572-9478

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract An error analysis of resonant orbits for geodesy indicates that attempts to use resonance to recover high order geopotential coefficients may be seriously hampered by errors in the geopotential. This effect, plus the very high correlations (up to .99) of the resonant coefficients with each other and the orbital period in single satellite solutions, makesindividual resonant orbits of limited value for geodesy. Multiple-satellite, single-plane solutions are only a slight improvement over the single satellite case. Accurate determination of high order coefficients from low altitude resonant satellites requires multiple orbit planes and small drift-periods to reduce correlations and effects of errors of non-resonant geopotential terms. Also, the effects of gravity model errors on low-altitude resonant satellites make the use of tracking arcs exceeding two to three weeks of doubtful validity. Because high-altitude resonant orbits are less affected by non-resonant terms in the geopotential, much longer tracking arcs can be used for them.