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  • Articles  (4)
  • Radio Science  (4)
  • 7535
  • Physics  (4)
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    Digital Transmission Techniques for a Long Haul HF Link: DS-SS vs. OFDM (2014)
    Wiley-Blackwell
    Details
    Publication Date: 2014-07-02
    Description: This paper presents two digital transmission techniques for long haul ionospheric links. Since 2003 we have studied the HF link between the Antarctic Spanish Base, Juan Carlos I, and Spain and we have described the link in terms of availability, signal to noise ratio (SNR) and delay and Doppler power profile. Based on these previous studies we have developed a test bed to investigate two digital transmission techniques, i.e. Direct Sequence Spread Spectrum and Orthogonal Frequency Division Multiplexing, which can provide a low power, low rate ionospheric data link from Antarctica. Symbol length, bandwidth and constellation are some of the features that are analyzed in this work. Data gathered from the link throughout the 2010/2011 and 2011/2012 Antarctic surveys show that spread spectrum techniques can be used to transmit data at low rate when the channel forecast is poor but when the channel forecast is good multicarrier techniques can be used to transmit sporadic bursts of data at higher rate.
    Print ISSN: 0048-6604
    Electronic ISSN: 1944-799X
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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  • 2
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    Vertical and Oblique ionospheric soundings over the long haul HF link between Antarctica and Spain (2015)
    Wiley-Blackwell
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    Publication Date: 2015-08-28
    Description: This paper presents a comparative study between the oblique sounding results, the ITU Rec533 HF prediction model and the vertical sounding results of a transequatorial long haul link. The long haul link is a 12760km link between the Spanish Antarctic Station, SAS, located in the Livingston Island and the Ebro Observatory (OE) in Spain. The data was collected during three consecutive surveys (2009/10, 2010/11 and 2011/12). The ionospheric channel from the SAS to the OE is studied in terms of frequency availability as function of time using the measurements of an oblique incidence sounder (OIS) and measurements of several vertical incidence sounding stations (VIS) placed near the estimated radiopropagation path. The results obtained show promising correlations between VIS and OIS measurements, and led us think that the frequency of largest availability for this particular long haul radio link can be estimated from the VIS sounding measurements.
    Print ISSN: 0048-6604
    Electronic ISSN: 1944-799X
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
    Location Call Number Limitation Availability
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  • 3
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    Polarization Diversity in a Long-Haul Transequatorial HF Link from Antarctica to Spain (2016)
    Wiley-Blackwell
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    Publication Date: 2016-12-13
    Description: This paper describes a set of experiments which examine the feasibility of applying polarization diversity to a 12760 km ionospheric link from Livingston Island (62.6 o S, 60.4 o W), South Shetlands, to Cambrils (41.0 o N, 1.0 o E), Spain. A transmitting monopole and both a monopole and a dipole (inverted-V) at reception are the antennas used in this measurement campaign. Receiving antennas are orthogonal polarized to check whether wave polarization rotation causes differences between simultaneous signals. The results gathered in the paper indicate that there is a marked difference between simultaneous signals at vertical and horizontal polarized antennas, which depends on the hour of the day and the signal frequency. In this low throughput HF data link, polarization diversity could be used to increase SNR and performance through smart combination of receiving signals, due to the low cross-correlation factor between them.
    Print ISSN: 0048-6604
    Electronic ISSN: 1944-799X
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
    Location Call Number Limitation Availability
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    PAPER CURRENT
  • 4
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    Vertical and Oblique Ionospheric Soundings Performance Comparison over the 12,760 km Transequatorial HF Link between Antarctica and Spain (2017)
    Wiley-Blackwell
    Details
    Publication Date: 2017-04-11
    Description: This paper presents the second part of the study of the oblique sounding of a 12,760 km transequatorial ionospheric link between Livingston Island (Antarctica) and Cambrils (CB) in Spain. The study consists of the comparison amongst the oblique sounding results using an inverted V as receiver antenna, the ITU Rec533 HF prediction model and the vertical sounding results on the path of the long-haul channel. The data was collected the last consecutive surveys, when the inverted V antenna was operative (2010-2011, 2011-2012, 2012-2013 and 2013-2014). The ionospheric channel is studied in terms of frequency availability depending on time using the measurements of an oblique incidence sounder (OIS), but also measurements of several vertical incidence sounding stations (VIS) on the path of the long-haul channel. The results obtained show similarities between the VIS and the OIS measurements; following previous studies preliminary results, the experiments conducted led us to think that the frequency of large availability can be estimated depending on the VIS sounding results.
    Print ISSN: 0048-6604
    Electronic ISSN: 1944-799X
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
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