scholarly journals Ionospheric Sounding and Tomography by GNSS

10.5772/54589 ◽  
2013 ◽  
Author(s):  
Vyacheslav Kunitsyn ◽  
Elena Andreeva ◽  
Ivan Nesterov ◽  
Artem Padokhi
Keyword(s):  
Ionospheric Sounding

scholarly journals Application of Biphase Complete Complementary Code for Ionospheric Sounding

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2811 ◽  
Author(s):  
Guobin Yang ◽  
Peng Duan ◽  
Chunhua Jiang ◽  
Tongxin Liu ◽  
Ting Lan ◽  
...  
Keyword(s):  
Signal Processing ◽  
Cross Correlation ◽  
Technical Feasibility ◽  
Performance Results ◽  
Ionospheric Sounding

This paper illustrates the processes carried out for the application of biphase complete complementary code (CCC) for ionospheric sounding to address the coherent interference problem in multi-station ionospheric sounding. An algorithm to generate the biphase CCC is described, and the detailed process of waveform construction and signal processing is presented. Characteristics of the autocorrelation and cross-correlation are analyzed through simulations, and the technical feasibility of the application of CCC is explored. Experiments of ionospheric sounding with the CCC are also implemented to verify performance. Results demonstrate that the CCC performs well in multi-station ionospheric sounding, and is capable of eliminating the coherent interference in the network of ionosondes, compared to the conventional complementary code.

scholarly journals A novel dual-channel HF radar system for ionospheric sounding

2018 ◽  
Vol 7 (1) ◽  
pp. 25-30
Author(s):  
Lei Qiao ◽  
Liang Huang ◽  
Xiao Cui
Keyword(s):  
Radar System ◽  
Hf Radar ◽  
Dual Channel ◽  
Ionospheric Sounding

scholarly journals OFDM signal with BPSK modulated subcarriers for multi-carrier ionospheric sounding

2019 ◽  
Vol 30 ◽  
pp. 15006
Author(s):  
Vladimir Ivanov ◽  
Natalya Ryabova ◽  
Alexey Elsukov ◽  
Alexey Laschevsky
Keyword(s):  
Mathematical Model ◽  
Simulation Modeling ◽  
Wide Band ◽  
Ofdm Signal ◽  
Research Findings ◽  
Ionospheric Sounding ◽  
Bpsk Modulation

Paper presents the developed algorithm for multi-carrier simultaneous vertical ionospheric sounding by OFDM signal with BPSK modulation of subcarriers. There is presented a mathematical model, numerical and simulation modeling with the use of USRP platform. Research findings proved the fundamental feasibility of using orthogonal subcarriers for simultaneous sounding of channels over a wide band.

scholarly journals Compatible analysis of vertical and oblique ionospheric sounding data

1996 ◽  
Vol 39 (4) ◽  
Author(s):  
I. V. Krasheninnikov ◽  
J. C. Jodogne ◽  
L. F. Alberca
Keyword(s):  
Ray Tracing ◽  
Electron Density ◽  
Ionospheric Sounding ◽  
Small Valley

Examples are presented of the ray-tracing synthesis of multifrequency Oblique Sounding (OS) data on the Dourbes (Belgium) í Roquetes (Spain) path using electron density height profiles derived from Vertical Sounding (VS) measurements at both terminals. Comparison with the measured OS ionograms provides a means of assessing the accuracy of the VS true-height procedure POLAN. Particular attention was paid to a consideration of the E-F1 valley, that as concluded is often less deep than currently supposed, when derived using both ordinary and extraordinary components of the VS ionograms. Also, it was found that the peak of the F1 -layer should be expressed more distinctly (sometimes with a small valley between the F1 and F2 layers) though the corresponding VS ionograms may have no discontinuity in the region.

scholarly journals Automatic estimation of dynamics of ionospheric disturbances with 1–15 minute lifetimes as derived from ISTP SB RAS fast chirp-ionosonde data

2018 ◽  
Vol 4 (1) ◽  
pp. 76-84
Author(s):  
Олег Бернгардт ◽  
Oleg Berngardt ◽  
Татьяна Бубнова ◽  
Tatyana Bubnova ◽  
Алексей Подлесный ◽  
...  
Keyword(s):  
Experimental Data ◽  
High Repetition Rate ◽  
Ionospheric Disturbances ◽  
Characteristic Parameters ◽  
Effective Height ◽  
High Repetition ◽  
Automatic Estimation ◽  
Vertical Drift ◽  
Electron Density Irregularities ◽  
Ionospheric Sounding

We propose and test a method of analyzing ionograms of vertical ionospheric sounding, which is based on detecting deviations of the shape of an ionogram from its regular (averaged) shape. We interpret these deviations in terms of reflection from the electron density irregularities at heights corresponding to the effective height. We examine the irregularities thus discovered within the framework of a model of a localized uniformly moving irregularity, and determine their characteristic parameters: effective heights and observed vertical velocities. We analyze selected experimental data for three seasons (spring, winter, autumn) obtained nearby Irkutsk with a fast chirp ionosonde of ISTP SB RAS in 2013–2015. The analysis of six days of observations conducted in these seasons has shown that in the observed vertical drift of the irregularities there are two characteristic distributions: wide velocity distribution with nearly 0 m/s mean and with standard deviation of ~250 m/s and narrow distribution with nearly –160 m/s mean. The analysis has demonstrated the effectiveness of the proposed algorithm for the automatic analysis of vertical sounding data with high repetition rate.

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