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825 - SAN - SANAE Antarctica HF Radar
Instrument Type: Instrument > Radar > CoherentIonosphericRadar > HFRadar
Observatory: None
Observation Site: SAN - SANAE Antarctica HF Radar
Operating Mode:

Instrument Page: SAN

The SANAE (South African National Antarctic Expedition) HF radar is located in Antarctica (71.68 deg S, -2.85 deg E) and looks over a section of ionosphere poleward of 65 deg S that covers much of East Antarctica. It has operated since 1997. The facility is part of the SuperDARN network of HF radars that extends from Alaska to Scandinavia in the Northern hemisphere and covers much of Antarctica in the Southern hemisphere. The SuperDARN radar for the most direct 2-D merging of SANAE velocity data is located at Halley Station. The radar forms and steers its beam by the phasing of transmissions from 16 elements in a linear antenna array. It has no second array for deriving elevation angle information. The basic radar operation consists of the following steps: i) selection of a beam position (0-15) ii) search for the quietest 5-kHz channel about the assigned transmitting frequency (8-20 MHz) iii) repeated transmission of a multi-pulse sequence over the selected integration period and reception of backscattered signal with gating in range (1-70) iv) calculation of the auto-correlation functions (ACFs). These operations are usually carried out in sequence for the 16 beam positions, which collectively constitute 1 scan. The beam integration period is usually 7 sec, and the scan repeat time is then 120 sec (2 min). Within a scan, beam 0 corresponds to the most westward beam position and beam 15 to the most eastward. The azimuth sector scanned is approximately 50 deg wide and is centered on 107.0 deg E of N.