Autonomous phase sensitive radar (ApRES) on Totten Glacier 2016-2019

Brief description

Raw data from eight autonomous phase sensitive radar (ApRES) installations on Totten Glacier, East Antarctica.

Site Lat Lon Installation Retrieval
TI01 -67.333 114.019 26-Nov-2016 20-Dec-2017
TI02 -67.234 114.469 16-Nov-2016 09-Jan-2019
TI03 -67.449 113.587 03-Dec-2016 03-Oct-2018
TI04 -67.408 114.106 03-Dec-2016 24-Dec-2018
TI05 -67.332 114.354 25-Nov-2016 08-Jan-2019
TI06 -67.544 113.695 03-Dec-2016 24-Dec-2018
TI07 -67.744 113.779 24-Dec-2018 08-Jan-2019
TI08 -67.576 113.915 23-Dec-2018 29-Jan-2019

ApRES phase-sensitive radar is a low-power, light-weight instrument developed in a collaboration between BAS and University College London. It is a 200-400 MHz FMCW radar, with a 1-second chirp, run by controller. Each radar was set to produce a burst of 30 chirps every 1.5 hrs, and a config file with radar settings is provided with each dataset. Each ApRES was co-located with a GPS.

Files:
*.dat - binary files containing raw data
config.ini - config file containing all radar settings used for each site
Log.txt - log file from each instrument

Software for processing the raw data can be obtained from Dr. Keith Nicholls, British Antarctic Survey. Limited Matlab scripts are provided here to open the raw data.

Command: f=fmcw_load('filename.DAT')

Data structure:
Variable name Unit Description
Nattenuators - Number of attenuation settings used (1 or 2)
Attenuator_1 dB RF Attenuator value 1
Attenuator_2 dB RF Attenuator value 2
ChirpsInBurst - Number of chirps in burst
TimeStamp day Time of first chirp (Matlab date format)
Temperature_1 C Instrument temperature 1
Temperature_2 C Instrument temperature 2
BatteryVoltage V Battery voltage
Burst - Number of burst in file
FileFormat - Identifies file format from different equipment versions
vif V Voltage
chirpTime day Time of chirp (Matlab date format)
filename - Filename
SamplesPerChirp - Number of samples per chirp
fs Hz Sampling frequency
f0 Hz Start frequency
K rad/s/s Chirp gradient (200MHz/s)
f1 Hz Stop frequency
B Hz Bandwidth
fc Hz Centre frequency
er - Material permittivity
ci m/s Velocity in material
lambdac m Centre wavelength
t s Sampling time (relative to first sample)
f Hz Frequency stamp for sample