Nikita Konkin
My scientific publications with a short analysis — summary, strengths, weaknesses, and suggestions.
The diurnal course of the coherence bandwidth of a transionospheric channel is decomposed into trend, seasonality and residual; the trend is extracted with a Hodrick — Prescott ...
The diurnal course of the MUF from a chirp ionosonde is smoothed with a Savitzky — Golay filter, outliers are found with an isolation forest, and XGBoost and linear regression t...
A month of five-minute MUF values on a 2,600 km mid-latitude path, XGBoost with hyperparameters tuned through hyperopt, and a mean-absolute-error threshold of 1 MHz: the tuned m...
An ionosonde on a USRP N210 transmits a multi-carrier signal of eight orthogonal subcarriers in a 200 kHz band, each with a 13-chip Barker code, and measures the impulse respons...
A passive chirp ionosonde on a USRP N210 estimates SNR and scattering parameters across the whole set of adjacent 3 kHz channels on the Cyprus — Yoshkar-Ola path. 1728 ionograms...
The coherence bandwidth is taken as the optimal frequency band of a satellite communication channel, and diagnostic maps from GLONASS/GPS data as the instrument for monitoring i...
Software and an AutoIt algorithm for building electronic diagnostic coherence-bandwidth maps from GPS/GLONASS data, with a PostgreSQL database used as an index over the intermed...
An algorithm and a working GNU Radio flowgraph for stepping the operating frequency of a panoramic SDR ionosonde across 0–30 MHz on the USRP platform: a sample count tags the st...
A hardware-and-software complex for building regional coherence-bandwidth maps from GLONASS/GPS data, with a separate derivation of how the stochastic TEC error propagates into ...
The paper derives the phase-dispersion parameters of a trans-ionospheric channel from an expansion of the refractive index and evaluates numerically which approximation matters ...
A short conference abstract in which Konkin, as first author, compactly sets out the algorithm for building diagnostic coherence-bandwidth maps for microwave-band trans-ionosphe...
The consolidated version of the work, bringing together both strands of the coherence-bandwidth study — oblique and trans-ionospheric sounding — into a single methodology: from ...
The CriMiCo'2016 conference paper — a fuller version of the coherence-bandwidth study, running from a parabolic ionosphere model and model ionograms to coherence-bandwidth maps ...
An engineering paper: an automated pipeline and animated diagnostic maps of coherence bandwidth built from GNSS data, the IRI model, and oblique sounding. The contribution is th...