A comparison of SuperDARN ACF fitting methods

Ribeiro, A. J.; Ruohoniemi, J. M.; Ponomarenko, P. V.; Clausen, L. B. N.; Baker, J. B.; Greenwald, R. A.; Oksavik, K.; Larquier, S. de

doi:10.1002/rds.20031

Cited by 41 publications

(79 citation statements)

References 21 publications

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“…One can see the average linear proportionality of the data obtained in the case of 7-10 pulse sequences, indicating the qualitative applicability of FitACF to interpret the data obtained by new signals, and the correctness of the signals themselves. Similar results were obtained for the LMFIT [Ribeiro et al, 2013] technique.…”

Section: Experimental Results With Quasi-optimal Sounding Sequencessupporting

confidence: 86%

“…At the present time, for regular SuperDARN observations mostly this kind of signals is used [Chisham et al, 2007;Ribeiro et al, 2013]. Examples of other types of sequences can be found, for example, in Schiffler [1996], Greenwald et al [2008], and Spaleta et al [2008].…”

Section: Shortest Superdarn Sounding Sequencesmentioning

confidence: 99%

“…Currently two signal types are used regularly at SuperDARN radars: standard 7-pulse [Schiffler, 1996] and 8-pulse katscan sequences [Ribeiro et al, 2013]. The use of these sequences for the detailed study of the spectral characteristics is almost impossible, since the spectral resolution provided by these sequences is too poor.…”

Section: Introductionmentioning

confidence: 99%

“…It is equivalent to the 100-200 m/s for the speed. One of the typical distributions of the measured parameters for EKB SuperDARN radar (procedure for determining parameters-FitACF [Ribeiro et al, 2013]). …”

Section: Introductionmentioning

confidence: 99%

“…At the moment, the problem of low spectral resolution on SuperDARN radars is solved by complex techniques that allows one to estimate the Doppler drift and the average spectral width of the signal without obtaining the spectrum, but based on the analysis of the correlation function and its phase structure, as well as on the basis of model assumptions [Hanuise et al, 1993;Schiffler et al, 1997;Barthes et al, 1998;Ponomarenko and Waters, 2006;Chisham et al, 2007;Ribeiro et al, 2013]. The fine structure of the spectra is frequently finer than 200 m/s [Huber and Sofko, 2000;Danskin et al, 2004], so for stable recognition and investigation of these structures the standard measurements require improving spectral resolution at least 2-3 times or use model-based inversion techniques [Schiffler et al, 1997;Barthes et al, 1998].…”

Section: Introductionmentioning

confidence: 99%

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Optimal signals of Golomb ruler class for spectral measurements at EKB SuperDARN radar: Theory and experiment

2015

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The requirements for quasi-optimal and optimal sequences for Super Dual Auroral Radar Network (SuperDARN) radar are stated for periodic multipulse sequences of the Golomb ruler class. The requirements are based on finding the sequences that provide the maximal first missing lag in autocorrelation function (ACF) of the received signal. The obtained quasi-optimal signals up to 26-pulse sequence are based on optimal and nearly optimal Golomb rulers. It is shown that standard 7-pulse SuperDARN sequence is one of the quasi-optimal sounding signals, but the 8-pulse katscan SuperDARN signal is not. The characteristics are calculated for quasi-optimal sounding sequences up to 26-pulse one. It is shown that the most effective signals for the spectral measurements (regarding the maximal first missing lag in ACF and minimal sequence length) are 10, 12, 14, 18, 20, 24, and 26 pulse sequences that correspond to the optimal Golomb rulers. We present the results of the first spectral measurements at the Ekaterinburg (EKB) SuperDARN radar with the quasi-optimal 8-and 9-pulse sequences, as well as with the optimal 10-and 12-pulse sequences. A comparison with the results obtained with the standard 7-pulse SuperDARN sequence was made. The continuity of results in amplitude and velocity is shown; the expected improvement in spectral resolution is also demonstrated.

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Section: Experimental Results With Quasi-optimal Sounding Sequencessupporting

confidence: 86%

Section: Shortest Superdarn Sounding Sequencesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimal signals of Golomb ruler class for spectral measurements at EKB SuperDARN radar: Theory and experiment

2015

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Estimating self‐clutter of the multiple‐pulse technique

Reimer

Hussey

2015

Radio Science

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Autocorrelation function (ACF) estimates from voltage data measured by high-frequency ionospheric radar systems that utilize the multiple-pulse technique of Farley (1972) are susceptible to interference from self-clutter. Self-clutter is caused by simultaneous returns from multiple transmitted pulses echoing from unwanted, or ambiguous ranges. Without accurate estimates of self-clutter it is impossible to account for all the uncertainty in estimates of the radar ACF. Voltage-and power-based self-clutter estimators are presented and evaluated using a modified version of the radar data simulator of Ribeiro et al. (2013a) and data from the Super Dual Auroral Radar Network (SuperDARN). It is shown that self-clutter caused by ambiguous ranges filled with ground scatter can be accurately estimated using a voltage-based self-clutter estimator but that for ionospheric origin self-clutter a maximal estimator must be used. Two maximal self-clutter estimators are discussed and verified using the radar data simulator. A discussion of the application of the self-clutter estimator as it is applied to ACFs obtained with Saskatoon SuperDARN radar is also presented.

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Global view of the E region irregularity and convection velocities in the high‐latitude Southern Hemisphere

Forsythe

Makarevich

2017

JGR Space Physics

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Occurrence of the E region plasma irregularities is investigated using two Super Dual Auroral Radar Network (SuperDARN) South Pole (SPS) and Zhongshan (ZHO) radars that sample the same magnetic latitude deep within the high‐latitude plasma convection pattern but from two opposite directions. It is shown that the SPS and ZHO velocity distributions and their variations with the magnetic local time are different, with each distribution being asymmetric; i.e., a particular velocity polarity is predominant. This asymmetry in the E region velocity distribution is associated with the bump‐on‐tail of the distribution near the nominal ion acoustic speed Cs that is most likely due to the Farley‐Buneman instability (FBI) echoes or an inflection point of the distribution below nominal Cs that is most likely due to the gradient drift instability echoes. In contrast, the distribution of the convection velocity component was found to be symmetric, i.e., with no bump‐on‐tail or an inflection point, but with a bias (i.e., uniform shift) toward a particular polarity. It is demonstrated that the asymmetry in the convection pattern between the eastward and westward zonal components is unexpectedly strong, with the westward zonal component being predominant, especially at lower latitudes, while also exhibiting a strong interplanetary magnetic field By dependence. The observations are consistent with the notion that the asymmetry in the E region velocity distribution is highly sensitive to the bias in the convection component caused by the zonal convection component asymmetry and that the bump‐on‐tail or inflection point features may also depend on the irregularity height and the presence of strong density gradients modifying the FBI threshold value.

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A comparison of SuperDARN ACF fitting methods

Cited by 41 publications

References 21 publications

Optimal signals of Golomb ruler class for spectral measurements at EKB SuperDARN radar: Theory and experiment

Optimal signals of Golomb ruler class for spectral measurements at EKB SuperDARN radar: Theory and experiment

Estimating self‐clutter of the multiple‐pulse technique

Global view of the E region irregularity and convection velocities in the high‐latitude Southern Hemisphere

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