On some relationships between correlation analysis and similar-fade analysis results of drift measurements in the lower ionosphere

Sprenger, K.; Schminder, R.

doi:10.1016/0021-9169(69)90107-x

Cited by 28 publications

(17 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, the maximum cross correlation will be at τ m = 0. Sprenger and Schminder (1969) argued that the simple similar fades approach produces a result very similar to the "apparent velocity" derived in the FCA method, whereas the velocity obtained from averaging the drift vectors produces a result in a term more similar to the "true velocity" in the FCA method. In this, the technique is similar to the simplest imaging Doppler interferometer (IDI) techniques, which we discuss below, and which produce a term similar to the apparent velocity.…”

Section: Spaced Antenna Analysis Techniquesmentioning

confidence: 98%

“…For completeness, we have included two techniques in this table that are no longer used. These are the LF ionospheric drift experiment (see Sprenger and Schminder 1969;Jacobi 2014) which used transmitters of opportunity, in the form of commercial broadcast radio transmitters, and the "partial reflection experiment" (PRE) radar for measuring electron densities which was established near Tromsø, Norway in 1975 (see Brekke et al 1985). This radar was the last of the large dedicated instruments for measuring electron densities in the lower ionosphere (see Belrose 1970 for a summary of instruments existing at that time).…”

Section: Mf and Hf Radar Techniques For The Mlt Regionmentioning

confidence: 99%

“…Similar fades The oldest and simplest analysis technique for spaced antenna data is the "method of similar fades" (see e.g., Mitra 1949;Krautkrämer 1950;Sprenger and Schminder 1969). This approach involves measuring Fig.…”

Section: Spaced Antenna Analysis Techniquesmentioning

confidence: 99%

“…A more contemporary description is given by Briggs (1984) and Holdsworth and Reid (1995a). However, as explained by Sprenger and Schminder 1969, at that time the FCA was relatively laborious and expensive, and so the simple similar-fade method was often preferred. They also describe another approach used with similar fades.…”

Section: Spaced Antenna Analysis Techniquesmentioning

confidence: 99%

See 3 more Smart Citations

MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

Reid

2015

Prog. in Earth and Planet. Sci.

View full text Add to dashboard Cite

The application of medium-frequency (MF) and high-frequency (HF) partial reflection radar to investigate the neutral upper atmosphere is one of the oldest such techniques still regularly in use. The techniques have been continuously improved and remain a robust and reliable method of obtaining wind velocities, turbulence intensities, electron densities, and measurements of atmospheric structure in the mesosphere lower thermosphere (MLT) region (50 to 110 km). In this paper, we review recent developments, discuss the strengths and weaknesses of the technique, and consider possible improvements.

show abstract

Section: Spaced Antenna Analysis Techniquesmentioning

confidence: 98%

Section: Mf and Hf Radar Techniques For The Mlt Regionmentioning

confidence: 99%

Section: Spaced Antenna Analysis Techniquesmentioning

confidence: 99%

Section: Spaced Antenna Analysis Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

Reid

2015

Prog. in Earth and Planet. Sci.

View full text Add to dashboard Cite

show abstract

“…SPRENGER and SCHMINDER (1969) considered the effects on drift parameters of filtering the fading records. They substracted the running mean from each record which had the effect of removing low frequency component and by varying the width of the running mean, the filter cut off frequency was varied.…”

Section: Thuinba F-region Drift Dependence Of Anisotropy Parameters Omentioning

confidence: 99%

Dependence of the Drift and Anisotropy Parameters of the Ground Diffraction Pattern at the Equator on the E-W and N-S Extent of the Antenna Separation

Misra

1973

J. geomagn. geoelec

View full text Add to dashboard Cite

Simultaneous observations of the ionospheric drift and anisotropy parameters of the ground diffraction pattern at Thumba (0.6S dip) using the spaced receiver technique were conducted at two adjacent receiving aerial systems of different sizes. It is shown that though the apparent drift speed Va shows very little dependence on the size of the triangle, the true drift speed V increases to some extent with the increasing E-W separation of the receiving aerials. The random drift speed V. shows slight decrease with increasing E-W separation while the true and apparent drift directions 5 and ca show almost no dependence. The axial ratio r of the characteristic ellipse shows a positive dependence on the N-S separation of the aerials while the transverse size b shows a small increase with the E-W separation. The orientation of the characteristic ellipse b tends to be more close to magnetic N-S with increasing N-S separation of receiver aerials.

show abstract

Effect of filtering on drift and anisotropy parameters determined by full correlation analysis

Chandra

1989

Proc. Indian Acad. Sci. (Earth Planet Sci.)

View full text Add to dashboard Cite

The effect of low-pass filtering on the various drift and anisotropy parameters obtained by full correlation analysis of spaced receiver records is studied theoretically. assuming Gaussian correlation functions. A decrease in the characteristic velocity V c is shown with increasing filtering, unless V >> V c, when V c increases with filtering. The ratio V,/V however shows an increase as the decrease in the true drift velocity V is steeper than V~. An increase in the size of the ground pattern with increasing filtering is also shown, while the axial ratio for anisotropic patterns shows a decrease. The results are verified with experimental data recorded earlier at Tiruchirapalli.

show abstract

On some relationships between correlation analysis and similar-fade analysis results of drift measurements in the lower ionosphere

Cited by 28 publications

References 8 publications

MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

Dependence of the Drift and Anisotropy Parameters of the Ground Diffraction Pattern at the Equator on the E-W and N-S Extent of the Antenna Separation

Effect of filtering on drift and anisotropy parameters determined by full correlation analysis

Contact Info

Product

Resources

About