Remote Sensing and Skywave Digital Communication from Antarctica

Bergadà, Pau; Deumal, M.; Vilella, C.; Regue, J.-R.; Altadill, D.; Marsal, Santiago

doi:10.3390/s91210136

Cited by 13 publications

(8 citation statements)

References 27 publications

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“…In this paper we compare the behavior of different transmission schemes based on DSSS and OFDM techniques, and we present some conclusions that derive from the data gathered during the 2010/2011 and 2011/2012 Antarctic surveys. Previous results [ Bergadà et al , ] showed preliminary conclusions supported on a reduced frequency and time range.…”

Section: Test Designmentioning

confidence: 80%

Digital transmission techniques for a long haul HF link: DSSS versus OFDM

et al. 2014

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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, 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 (DSSS) and Orthogonal Frequency Division Multiplexing (OFDM), 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 the 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.

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Section: Test Designmentioning

confidence: 80%

Digital transmission techniques for a long haul HF link: DSSS versus OFDM

et al. 2014

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“…The typical pattern of the summer behavior of the ionospheric F2 characteristics and of their variability was evaluated for different Spanish Antarctic surveys, and the differences of the above patterns from survey to survey were related to the different solar activity [54]. Such a pattern at mid-high latitudes of the ASJI was also compared with the summer behavior at other mid-latitude stations and it was noticed a larger post-sunset electron density enhancement at the ASJI than that recorded in other regions.…”

Section: Vertical Ionospheric Soundingmentioning

confidence: 99%

Remote Geophysical Observatory in Antarctica with HF Data Transmission: A Review

et al. 2014

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Abstract:The geophysical observatory in the Antarctic Spanish Station, Juan Carlos I (ASJI), on Livingston Island, has been monitoring the magnetic field in the Antarctic region for more than fifteen years. In 2004, a vertical incidence ionospheric sounder completed the observatory, which brings a significant added value in a region with low density of geophysical data. Although the ASJI is only operative during the austral summer, the geomagnetic station records the data throughout the year. A High Frequency (HF) transmission system was installed in 2004 in order to have the geomagnetic data available during the whole year. As the power supply is very limited when the station is not operative, we had to design a low-power HF transceiver with a very simple antenna, due to environmental aspects. Moreover, the flow of information was unidirectional, so the modulation had to be extremely robust since there is no retransmission in case of error. This led us to study the main parameters of the ionospheric channel and to design new modulations specially adapted to very low signal to noise scenarios with high levels of interference. In this paper, a review of the results of our remote geophysical observatory and associated transmission system in Antarctica during the last decade is presented.

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“…The system was designed to satisfy a project born in 2003 with a double objective: to transmit the data from remote sensors located at the Spanish Antarctic Station Juan Carlos I directly to Spain but implementing a long-haul oblique ionospheric sounder also. For more details on the system we refer the reader to [14,15].…”

Section: System Descriptionmentioning

confidence: 99%

Interannual Variation of a 12,760 km Transequatorial Ionospheric Channel Availability and Its Dependence on Ionization

Orga

Altadill

Hervás

et al. 2016

Proceedings of the 1st International Electronic Conference on Atmospheric Sciences

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Abstract:The ionosphere provides a channel able for long-haul and Non-Line-Of-Sight (NLOS) communications. Nonetheless, the amount of ionization depends on the Sun activity, whose diurnal and seasonal cycles transform the channel constantly. La Salle and the Observatori de l'Ebre have been sounding a 12,760 km ionospheric channel from Antarctica (62.7°S, 299.6°E) to Spain (41.0°N, 1.0°E) in order to find this evidence and to analyze the characteristics of this particular channel. The final goal of the project is to establish a stable communications link to be used as backup or for low rate data transmission. The aim of this paper is to prove the relation between the channel availability and the Sun phenomena affecting the ionization in four consecutive sounding campaigns.

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Remote Sensing and Skywave Digital Communication from Antarctica

Cited by 13 publications

References 27 publications

Digital transmission techniques for a long haul HF link: DSSS versus OFDM

Digital transmission techniques for a long haul HF link: DSSS versus OFDM

Remote Geophysical Observatory in Antarctica with HF Data Transmission: A Review

Interannual Variation of a 12,760 km Transequatorial Ionospheric Channel Availability and Its Dependence on Ionization

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