Frequency-Dependent Ionospheric Refraction Effects on the Doppler Shift of Satellite Signals

Willman, Joseph F.

doi:10.1109/taes.1965.4501697

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…The effect of other ionospheric factors on the multi-path time delay and Doppler shift should be considered. Some studies have initially conducted research on this topic [36][37][38], and this field is a future research direction for us.…”

Section: Future Workmentioning

confidence: 99%

Statistical Characteristics of the Multi-Path Time Delay and Doppler Shift of a Radar Wave Propagating Through the Ionosphere

Ma¹,

Guo²,

Su³

2013

PIER

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Abstract-Multi-path time delay spread is a very important factor in the bit error rate of high-frequency ionospheric communication channels and in the target detection performance of over-the-horizon radars. In this study, the probability density distribution of multi-path time delay and Doppler shift of ionospheric radio signal are derived using Rayleigh fading. Moreover, the probability density distribution of time delay, average power of the received signal, and received signal variance are discussed in detail. Using a designed experimental circuit, the measured value of the multi-path time delay spread is obtained from three given radio paths by the sweep-frequency pulse sounding technique. The average value of the multi-path time delay spread that changes with the ratio K, which is the operating frequency of the basic maximum usable frequency, is also analyzed and fitted using the least-squares fitting method. Theoretical and statistical research shows that for a given radio path and specific frequency, the multi-path time delay spread approximately follows a normal distribution. The average time delay spread decreases with the increase in the ratio K; however, it eventually approaches a steady value. The results of this research provide an empirical reference for further prediction and estimation of the time delay spread of a radar wave propagating through the ionosphere.

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Section: Future Workmentioning

confidence: 99%

Statistical Characteristics of the Multi-Path Time Delay and Doppler Shift of a Radar Wave Propagating Through the Ionosphere

Ma¹,

Guo²,

Su³

2013

PIER

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“…Three harmonically related phase-coherent signals also have been used in other studies [Willman, 1963[Willman, , 1965. These signals allowed the measurement of the vacuum Doppler shift, the time rate of change of the columnar electron concentration, and a residual ionospheric contribution.…”

Section: Introductionmentioning

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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The effects of propagation of radio waves in a three-dimensionally inhomogeneous magnetically active ionosphere

Krokhmalnikov¹,

Solodovnikov²

1972

Radiophys Quantum Electron

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Frequency-Dependent Ionospheric Refraction Effects on the Doppler Shift of Satellite Signals

Cited by 6 publications

References 8 publications

Statistical Characteristics of the Multi-Path Time Delay and Doppler Shift of a Radar Wave Propagating Through the Ionosphere

Statistical Characteristics of the Multi-Path Time Delay and Doppler Shift of a Radar Wave Propagating Through the Ionosphere

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

The effects of propagation of radio waves in a three-dimensionally inhomogeneous magnetically active ionosphere

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