A dual ionospheric sounding system monitor for HF RTCE

1994 ◽  
Author(s):  
M. Ripley
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.

scholarly journals Longitudinal differences observed in the ionospheric F-region during the major geomagnetic storm of 31 March 2001

2004 ◽  
Vol 22 (9) ◽  
pp. 3221-3229 ◽  
Author(s):  
Y. Sahai ◽  
P. R. Fagundes ◽  
F. Becker-Guedes ◽  
J. R. Abalde ◽  
G. Crowley ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Recovery Period ◽  
Negative Phase ◽  
Quiet Period ◽  
Geomagnetic Disturbances ◽  
Low Latitude ◽  
F Region ◽  
Similarities And Differences ◽  
Worldwide Network ◽  
Ionospheric Sounding

Abstract. A new ionospheric sounding station using a Canadian Advanced Digital Ionosonde (CADI) was established for routine measurements by the "Universidade do Vale do Paraiba (UNIVAP)" at São José dos Campos (23.2° S, 45.9° W), Brazil, in August 2000. A major geomagnetic storm with gradual commencement at about 01:00 UT was observed on 31 March 2001. In this paper, we present and discuss salient features from the ionospheric sounding measurements carried out at S. J. Campos on the three consecutive UT days 30 March (quiet), 31 March (disturbed) and 1 April (recovery) 2001. During most of the storm period, the foF2 values showed negative phase, whereas during the two storm-time peaks, large F-region height variations were observed. In order to study the longitudinal differences observed in the F-region during the storm, the simultaneous ionospheric sounding measurements carried out at S. J. Campos, El Arenosillo (37.1° N, 6.7° W), Spain, Okinawa (26.3° N, 127.8° E), Japan and Wakkanai (45.5° N, 141.7° E), Japan, during the period 30 March-1 April 2001, have been analyzed. A comparison of the observed ionospheric parameters (h'F and foF2) in the two longitudinal zones (1. Japanese and 2. Brazilian-Spanish) shows both similarities and differences associated with the geomagnetic disturbances. Some latitudinal differences are also observed in the two longitudinal zones. In addition, global ionospheric TEC maps from the worldwide network of GPS receivers are presented, showing widespread TEC changes during both the main and recovery phases of the storm. The ionospheric sounding measurements are compared with the ASPEN-TIMEGCM model runs appropriate for the storm conditions. The model results produce better agreement during the quiet period. During the disturbed period, some of the observed F-region height variations are well reproduced by the model results. The model foF2 and TEC results differ considerably during the recovery period and indicate much stronger negative phase at all the stations, particularly at the low-latitude ones.

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