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

Raw data from eight autonomous phase sensitive radar (ApRES) installations on Totten Glacier, East Antarctica, and processed basal melt rates for the four sites on the floating ice shelf (TI01, TI02, TI04, TI05).Site        Lat        Lon        Installation    RetrievalTI01        -67.333    114.019    26-Nov-2016    20-Dec-2017TI02        -67.234    114.469    16-Nov-2016    09-Jan-2019TI03        -67.449    113.587    03-Dec-2016    03-Oct-2018TI04        -67.408    114.106    03-Dec-2016    24-Dec-2018TI05        -67.332    114.354    25-Nov-2016    08-Jan-2019TI06        -67.544    113.695    03-Dec-2016    24-Dec-2018TI07        -67.744    113.779    24-Dec-2018    08-Jan-2019TI08        -67.576    113.915    23-Dec-2018    29-Jan-2019ApRES 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 dataconfig.ini - config file containing all radar settings used for each siteLog.txt - log file from each instrumentThe ApRES processing scripts are available at the following repository: https://github.com/irenavankova/ApRES_processing. Limited Matlab scripts are provided here to open the raw data.Command: f=fmcw_load('filename.DAT')Data structure:Variable name     Unit    DescriptionNattenuators     -     Number of attenuation settings used (1 or 2)Attenuator_1     dB     RF Attenuator value 1Attenuator_2     dB     RF Attenuator value 2ChirpsInBurst     -     Number of chirps in burstTimeStamp     day    Time of first chirp (Matlab date format)Temperature_1 C     Instrument temperature 1Temperature_2 C     Instrument temperature 2BatteryVoltage     V     Battery voltageBurst     -     Number of burst in fileFileFormat     -     Identifies file format from different equipment versionsvif     V     VoltagechirpTime     day    Time of chirp (Matlab date format)filename     -     FilenameSamplesPerChirp    -    Number of samples per chirpfs     Hz     Sampling frequencyf0     Hz     Start frequencyK     rad/s/s    Chirp gradient (200MHz/s)f1     Hz     Stop frequencyB     Hz     Bandwidthfc     Hz     Centre frequencyer     -     Material permittivityci     m/s     Velocity in materiallambdac     m     Centre wavelengtht     s     Sampling time (relative to first sample)f     Hz     Frequency stamp for sample