Determination of permittivity variations in the troposphere by scatter-propagation methods

Gjessing, Dag T.

doi:10.1049/pi-c.1962.0062

Cited by 4 publications

(5 citation statements)

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“…For a line of sight path (if a scatter experiment could be realized on such a path), it is the horizontal component of the three-dimensional spectrum that matters. If the path length is large, it is the component along a direction which is close to being vertical that has the dominating influence (Gjessing, 1962). In conclusion we note: (a) Refraction effects have a marked influence on the structure deductions in a field-strength correlation experiment (see Equations (16) and (17)).…”

Section: (~(K)~k-")mentioning

confidence: 83%

“…Hence by means of the group of experiments in their simplest form here discussed, one cannot distinguish between a thin layer and homogeneous turbulence. There are experimental refinements, such as beamswinging refinements (Gjessing, 1962) which increase the diagnostic potential of the simple techniques considerably. Still, the six techniques do not appear to lend themselves readily to the Af-~ 500 MHz study at hand.…”

Section: Discussionmentioning

confidence: 99%

“…Admittedly there are special sets of e.g., beamswinging experiments, that at least in principle can reveal the differences (see e.g., Gjessing, 1962) but on the basis of simple single experiments and reasonable beamwidths, it is very difficult to analyse a single-layer structure.…”

Section: Time Delay Measurementsmentioning

confidence: 99%

“…It can be shown (Gjessing, 1962) If, however, we have access to the absolute Doppler frequency at the receiver, i.e., we can measure not only the Doppler spread, but also the shift Fo, we can obtain information about the mean cross-path wind by pointing narrow-beam antennas off the great-circle bearing by an amount a which should be at least a couple of beamwidths.…”

Section: Measurement Of Air Velocity From Doppler Measurementsmentioning

confidence: 99%

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On the use of forward scatter techniques in the study of turbulent stratified layers in the troposhere

Gjessing

1973

Boundary-Layer Meteorol

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Abstract. This review paper considers the potentials of forward scatter radio techniques as a diagnostic tool in the study of stratified turbulent layers. Seven classes of experimental techniques have been considered (beamswinging, multifrequency, vertical and horizontal field strength correlation, coupling loss, pulse delay and bandwidth measurements). All these techniques with the exception of bandwidth and delay experiments measure directly or indirectly the irregularity spectrum of refractive index. Bandwidt hand delay distributions are determined by the vertical distribution of the refractivity irregularities. Thus for the purpose of obtaining information about a layered structure where our interest is focused on the vertical refractivity distribution rather than on the averaged spectral properties of the structure, the last two categories of experiments appear to represent a powerful tool. If one is interested in the spectral properties, multifrequency and beamswinging experiments are of great potential value whereas other experiments such as that measuring coupling loss are largely influenced by pure refraction effects.

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Section: (~(K)~k-")mentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Time Delay Measurementsmentioning

confidence: 99%

Section: Measurement Of Air Velocity From Doppler Measurementsmentioning

confidence: 99%

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On the use of forward scatter techniques in the study of turbulent stratified layers in the troposhere

Gjessing

1973

Boundary-Layer Meteorol

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“…The work reported herein is essentially concerned with a study of the theory of different line-of-sight experiments in the optical frequency range that will be useful in investigating the fine structure of the atmosphere. Several workers have investigated, both in theory and practice, the use of electromagnetic signals as a means of studying the atmospheric microstructure [Bolgiano, 1963;Gjessing, 1962]. These methods were based on the theoretical prediction that the received signal in a beyond-the-horizon propagation link is a function of the permittivity spectrum, q•(K), where 2.…”

Section: Introductionmentioning

confidence: 99%

The feasibility of laser experiments for measuring atmospheric turbulence parameters

Strohbehn¹

1966

J. Geophys. Res.

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An investigation of the feasibility of several line‐of‐sight propagation experiments utilizing lasers in studying atmospheric turbulence has shown that it is possible, theoretically, to find the permittivity spectrum, Φ(K), or its associated correlation function from measurements of the correlation function of amplitude, phase, or angle of arrival over parallel line‐of‐sight paths. Although the phase variations are relatively insensitive to variations in the assumed permittivity spectrum, the angle‐of‐arrival and amplitude measurements are more sensitive and hence would be more suitable for attempting to determine Φ (K) experimentally. From the point of view of communications analysis, the results show that the assumed Φ (K) is not too important in the analysis of phase variations but is quite important in the analysis of angle‐of‐arrival and amplitude variations.

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Scattering of radio waves by a moving atmospheric rippled layer: A simple model-experiment

Gjessing

Irgens²

1964

IEEE Trans. Antennas Propagat.

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The results from a simple, light analog modelexperiment are presented. Employing sinusoidal layers made from tinfoil it is found that the experimental results compare favourably with those obtained theoretically [l]. Experiments are then performed using layers of irregular shape. These experiments show that one would expect an atmospheric layer with irregular boundary to give rise to the same general type of permittivity field, from the point of view of degree of isotropy, as that observed in practical transhorizon experiments 131.

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Determination of permittivity variations in the troposphere by scatter-propagation methods

Cited by 4 publications

References 4 publications

On the use of forward scatter techniques in the study of turbulent stratified layers in the troposhere

On the use of forward scatter techniques in the study of turbulent stratified layers in the troposhere

The feasibility of laser experiments for measuring atmospheric turbulence parameters

Scattering of radio waves by a moving atmospheric rippled layer: A simple model-experiment

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