Accuracy of satellite Doppler data for ionospheric study, navigation, and geodesy

Willman, Joseph F.; Tucker, A. J.

doi:10.1029/ja073i001p00385

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…These techniques provide additional means of improving accuracy of results obtained from refracted Doppler measurements. The improvement in the determination of the columnar electron concentration by using three-frequency Doppler data has been presented tWillman and Tucker, 1968]. The influence of refraction effects in geodetic studies will be presented in a future article.…”

Section: Curves Inmentioning

confidence: 99%

Analysis of ionospheric contributions to the Doppler shift of CW signals from artificial Earth satellites

Tucker¹,

Fannin²

1968

J. Geophys. Res.

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Radio signals from artificial earth satellites propagated through the earth’s ionosphere are subjected to phase delay, refraction, and attenuation. These effects cause uncertainties in the determination of the vacuum Doppler shift of CW signals. To understand the nature of these ionospheric contributions to the Doppler shift, a theoretical expression for the refracted Doppler shift that is an inverse power series in terms of the frequency of the signal has been derived. A computer program has been written that uses ray theory in conjunction with a model ionosphere to evaluate each term of this expression. The nature of each term is discussed, and its relative importance is shown. The ionospheric contributions that are proportional to (1/ƒ) and (1/ƒ³), which result from phase delay and refraction, respectively, are the predominate terms; therefore the effects of refraction on a radio signal can be connected by using three‐frequency Doppler data. The ionospheric contribution that is proportional to (1/ƒ²) is insignificant. Three‐frequency Doppler data were recorded to evaluate the refraction effects in the refracted Doppler data. Two sets of experimental data are included that show the refraction effects.

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Section: Curves Inmentioning

confidence: 99%

Analysis of ionospheric contributions to the Doppler shift of CW signals from artificial Earth satellites

Tucker¹,

Fannin²

1968

J. Geophys. Res.

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“…-1 A stability of 1 p a r t in lo1' in the oscillator is equivalent t o 3 c m s e c and t h e r e is abundant evidence that the Doppler data can be acquired to an a c c u r a c y of 1 to 2 cm s e c ionospheric effects (Willman and Tucker, 1968;Tucker and Fannin, 1968; B e r b e r t , Applied Physics Laboratory, 1968).…”

Section: Introductionmentioning

confidence: 99%

Measurable Effect of General Relativity in Satellite Orbits

Gaposchkin

Wright

1969

Nature

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Satellite geodesy: Methods

Chovitz

1971

EoS Transactions

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General Theory. Analytic solutions for the motion of a near‐earth satellite are of practical importance for orbit prediction and establishment of reference orbits I (intermediaries) for minimizing perturbations from which the geodetic information is extracted. The best known ones currently in use at various computing laboratories are those of Brouwer and Vinti. Bonavito et al. [1969] favor Vinti's method because of its apparently better speed and accuracy. However, this preference has been questioned by Break‐ well and Vagners [1970], who claim that it is possible to choose initial conditions for the generation of a Brouwer orbit that keep the errors within acceptable bounds. The Vinti solution has been generalized to hold for triaxially ellipsoidal coordinates [Madden, 1970] so that the equatorial ellipticity can be made part of the reference potential. Deprit and Rom [1970] have refined Brouwer's solution to higher orders of the oblateness by the application of Lie transforms and by the development of requisite literal expansions on a computer. A new intermediary that has received much favorable attention because of its ability to generate higher‐order terms in relatively simple fashion is Aksnes' [Garfinkel and Aksnes, 1970].

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Accuracy of satellite Doppler data for ionospheric study, navigation, and geodesy

Cited by 5 publications

References 17 publications

Analysis of ionospheric contributions to the Doppler shift of CW signals from artificial Earth satellites

Analysis of ionospheric contributions to the Doppler shift of CW signals from artificial Earth satellites

Measurable Effect of General Relativity in Satellite Orbits

Satellite geodesy: Methods

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