Autonomous phase sensitive radar (ApRES) on Amery Ice Shelf 2015-2018

Raw data from two autonomous phase sensitive radar (ApRES) installations on Amery Ice Shelf, East Antarctica.Site, Lat, Lon, Installation, RetrievalAM06_borehole, -70.228432, 71.391693, 17-Jan-2015, 03-Feb-2018AM06_downstream, -70.225635, 71.395988, 09-Mar-2015, 03-Feb-2018ApRES 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 50 chirps every 4 hrs, and a config file with radar settings is provided with each dataset. Files:*.dat - binary files containing raw dataconfig.ini - config file containing all radar settings used for each siteSoftware 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     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