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David Altadill     University Educator/Researcher 
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David Altadill published an article in January 2018.
Top co-authors See all
Adriano Camps

110 shared publications

Universitat Politècnica de Catalunya & IEEC/CTE-UPC, UPC Campus Nord, 08034 Barcelona, Spain

Estefania Blanch

15 shared publications

Observatori de l'Ebre, (OE), CSIC - Universitat Ramon Llull, Roquetes, Spain

Bodo W. Reinisch

11 shared publications

Ivan A. Galkin

11 shared publications

José Miguel Juan

11 shared publications

Universitat Politècnica de Catalunya & IEEC/CTE-UPC, UPC Campus Nord, 08034 Barcelona, Spain

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Publication Record
Distribution of Articles published per year 
(2008 - 2018)
Total number of journals
published in
 
5
 
Publications See all
Article 1 Read 0 Citations Oblique Ionograms Automatic Scaling Algorithm OIASA application to the ionograms recorded by Ebro observatory ionosonde Alessandro Ippolito, David Altadill, Carlo Scotto, Estefania... Published: 01 January 2018
Journal of Space Weather and Space Climate, doi: 10.1051/swsc/2017042
DOI See at publisher website
Article 1 Read 1 Citation Feasibility of precise navigation in high and low latitude regions under scintillation conditions José Miguel Juan, Jaume Sanz, Guillermo Gonzalez-Casado, Adr... Published: 01 January 2018
Journal of Space Weather and Space Climate, doi: 10.1051/swsc/2017047
DOI See at publisher website
Article 1 Read 1 Citation Climatology characterization of equatorial plasma bubbles using GPS data Sergio Magdaleno, Miguel Herraiz, David Altadill, Benito A. ... Published: 01 January 2017
Journal of Space Weather and Space Climate, doi: 10.1051/swsc/2016039
DOI See at publisher website
CONFERENCE-ARTICLE 3 Reads 0 Citations Interannual Variation of a 12,760 km Transequatorial Ionospheric Channel Availability and Its Dependence on Ionization Ferran Orga, David Altadill, Marcos Hervás, Rosa Alsina-Pagè... Published: 15 July 2016
The 1st International Electronic Conference on Atmospheric Sciences, doi: 10.3390/ecas2016-A003
DOI See at publisher website
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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.

Article 0 Reads 5 Citations Narrowband and Wideband Channel Sounding of an Antarctica to Spain Ionospheric Radio Link Marcos Hervás, Rosa Ma Alsina-Pages, Ferran Orga, David Alta... Published: 14 September 2015
Remote Sensing, doi: 10.3390/rs70911712
DOI See at publisher website
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La Salle and Ebro Observatory have been involved in remote sensing projects in Antarctica for the last 11 years (approximately one solar cycle). The Ebro Observatory has been monitoring and analyzing the geomagnetic and the ionospheric activity in the Antarctic Spanish station Juan Carlos I (ASJI) (62.7°S, 299.6°E) for more than eighteen and ten years, respectively. La Salle has two main goals in the project. The first one is the data transmission and reception from Antarctica to Spain to obtain a historical series of measurements of channel sounding of this 12,760-km ionospheric HF (high frequency) radio link. The second one is the establishment of a stable data low power communication system between the ASJI and Cambrils, Spain (41.0°N, 1.0°E), to transmit the data from the remote sensors located on the island. In this paper, both narrowband and wideband soundings have been carried out to figure out the channel availability performed using a frequency range from 2 to 30 MHz with 0.5 MHz step during the 24 h of the day, encompassing wider channel measurements than previously done, in terms of hours and frequency. This paper presents the results obtained for the austral summer in 2014, using a monopole antenna at the transmitter and an inverted V on the receiver side. These results led us to the final physical layer design for the long Remote Sens. 2015, 7 11713 haul link, dividing the day into two parts: daytime, with low data throughput design, and nighttime, reaching high data throughput.
CONFERENCE-ARTICLE 2 Reads 0 Citations Remote Sensor Data Transmission from Antarctica to Spain with a Long-Haul HF Ionospheric Link Rosa Ma Alsina-Pagès, David Badia, Pau Bergadà, Marcos Hervá... Published: 22 June 2015
1st International Electronic Conference on Remote Sensing, doi: 10.3390/ecrs-1-h003
DOI See at publisher website
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The geophysical observatory in the Antarctic Spanish Station Juan Carlos I (BAE), on Livingston Island (62.6S, 60.4W), has been monitoring the magnetic field in the Antarctic region for more than fifteen years. In 2004, a vertical incidence ionospheric sounder was incorporated to the observatory, which brings a significant added value in a region with low density of geophysical data. A High Frequency (HF) communications system was installed in 2004 in order to transmit the geomagnetic station recordings throughout the year, due to the fact that the BAE is only accessible during the austral summer. As the power supply is very limited when the station is not accessible, we had to design a low-power HF transceiver with a very simple antenna, due to environmental restrictions. Moreover, the flow of information is unidirectional, so the modulation has 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 (Signal to Noise Ratio -SNR-, delay spread, Doppler spread and availability) with narrowband and wideband soundings, and the design of modulations specially adapted to very low SNR scenarios with high levels of interference. In this poster, a review of the design of our remote geophysical observatory and associated transmission system from Antarctica to Spain (12760 km) during the last decade is presented.