Narrowband and Wideband Channel Sounding of an Antarctica to Spain Ionospheric Radio Link M. Hervás, R.M. Alsina-Pagès, F. Orga, J.L. Pijoan and D.Badia GR-SETAD La Salle, Universitat Ramon Llull D. Altadill Observatori de l’Ebre, (OE), CSIC - Universitat Ramon Llull, (mhervas@salleurl.edu)
Index 1. Introduction 2. Measured Parameters 1. Geomagnetic Parameters 2. Vertical incidence soundings 3. Oblique ionosonde soundings 3. System description 4. Data analysis 5. Results 1. Narrowband 2. Wideband 6. Conclusions La Salle, Ramon Llull University (URL) - GRSETAD 2/15
1. Introduction Antarctic Project Long-haul link between Antarctica to Spain to transmit data from remote sensors. Oblique Ionospheric Sounder 12.760Km La Salle, Ramon Llull University (URL) - GRSETAD 3/15
1. Introduction 20 km 20 mi La Salle, Ramon Llull University (URL) - GRSETAD 4/15
2. Measured Parameters Geomagnetic Parameters La Salle, Ramon Llull University (URL) - GRSETAD 5/15
2. Measured Parameters Vertical ionosonde La Salle, Ramon Llull University (URL) - GRSETAD 6/15
2. Measured Parameters Oblique ionosonde La Salle, Ramon Llull University (URL) - GRSETAD 7/15
3. System Description Transmitter Receiver La Salle, Ramon Llull University (URL) - GRSETAD 8/15
4. Data Analysis Narrowband Wideband SNR Doppler Spread Availability Multipath Delay Spread La Salle, Ramon Llull University (URL) - GRSETAD 9/15
4. Data Analysis Narrowband sounding idle0 idle1 t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 idle2 idle3 Kaiser windowing of 10 Hz of BW Signal is measured in 10 slot t0-t9 Noise is measured in 4 idle slots La Salle, Ramon Llull University (URL) - GRSETAD 10/15
4. Data Analysis Narrowband sounding SNR (dB) of February 17 th (in dB) over a bandwidth of 10 Hz Night Sunrise Day Sunset Night 30 35 25 30 25 20 Frequency (MHz) 20 15 15 10 10 5 5 0 0 5 10 15 20 Hours (UTC) La Salle, Ramon Llull University (URL) - GRSETAD 11/15
4. Data Analysis Wideband sounding Delay Power τ c Profile Channel Scattering r [n]´ Correlation Matrix Function Doppler v c e j2 πδ ft Power Profile S e La Salle, Ramon Llull University (URL) - GRSETAD 12 /15
5. Results Narrowband sounding Availability (%): if SNR>3dB over the 70% of time or if SNR>6dB over the 50% of time 30 90 80 25 70 60 Frequency (MHz) 20 50 15 40 30 10 20 5 10 0 0 5 10 15 20 Time (UTC) La Salle, Ramon Llull University (URL) - GRSETAD 13/15
5. Results Wideband sounding Delay Power τ c Profile Channel Scattering r [n]´ Correlation Matrix Function Doppler v c e j2 πδ ft Power Profile S e Mean value for Delay Spread in ms Mean value for Doppler Spread in Hz La Salle, Ramon Llull University (URL) - GRSETAD 14/15
5. Conclusions This paper presents Narrowband: SNR and availability. Wideband: Time and Doppler scattering. This allow us to define fully the physical layer: Robust and high throughput mode. Future work Study the historical series for the entire solar cycle. End the design of the HF modem: modulation, coding and interleaving La Salle, Ramon Llull University (URL) - GRSETAD 15/15
Finally Thank you for your attention La Salle, Ramon Llull University (URL) - GRSETAD 16
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