NRT data stream from the gliders Slocum and

NRT data stream from the gliders Slocum and Spray to Coriolis EGO meeting Paris 2 -3/10/06

Slocum Electric Glider Specs. Science Bay Specs. Length: 1. 5 m Hull Diameter: 21. 3 cm Weight: 52 kg Length: 30 cm Diameter: 21. 3 cm Max. Payload Weight: 4 kg

Fin + Wet section Hydraulic section Argos antenna CTD Wing + Iridium antenna Electronic section Wing + GPS antenna

Autonomous Underwater Gliding Vehicle (AUGVs): GLIDERS Coriolis Data Center IFREMER Brest, France Numerical Models Mercator, MFS, . . . Ground Station IFM-GEOMAR Kiel, Germany U ~ 20 -40 cm/s W ~ 10 -20 cm/s 1 k m ~2 -5 km between surfacings

Iridium Dial up Data service

Slocum data stream • Slocum : always caller • 1 phone number i. e. modem – Kermit session – Dockserver session

Kermit sessions – Automatic session • kermit script – Upload the data (short binary data sbd files 20 -60 kb) – Zmodem protocol – Avoid re-sending part of a file already sent • Shell & matlab scripts – Update website – Push the data on a Coriolis ftp site – Manual session • Slocum « live session» • Type commands • Download new mission files

Dockserver: Remote Automated Control Web Interface (Java Based Applet) Automated Control Surface Dialogue Glider Connection Status Need a function to push the data to Coriolis ?

Evolution of Glider Control: GRCS to Dockserver Rutgers: (2002 -2004) Glider Remote Control System (GRCS) - Automated iridium connection - Data File transfer - Surface Dialogue logging - Email notification 8 Line Ringdown Modem Bank Webb Research/Dinkum Software (2004 -Pres) Dockserver - Automated iridium connection - Data file transfer - Surface dialogue logging - Email notification - Manual and automated scripting - File transfer - Mission retasking - Web interface for worldwide connectivity

Spray communication

Iridium Short Burst Data Services

Spray data stream • Spray : send/receive emails – Up to 5 primary receivers/senders – Send data usually 1 mail (sbd files < 2 kb) – Receive mails (a few bytes) – Automatic routines (perl, matlab) launched by mail related programs/files (sendmail, procmail, . forward, …) – Automatic redirection of mails/data to unlimited numbers of recipients

Automatic session Mail server Forward (Coriolis, users, …) Get/put mails Groundstation • • • Extract data from mail (attached file) Decode/chek Update website Email notification (short status) SMS notification (abort) Generate mails for Spray control and command

Data Access http: //www. ifm. uni-kiel. de/fb/fb 1/po 2/research/mersea/gliders/spray 004_position. html Mersea In-Situ Portal data visualization http: //www. coriolis. eu. org/cdc/data. Selection/cdc. Data. Selections. asp Coriolis data selection website data visualization and download Coriolis ftp server

Quality Control and Metadata QC procedures at Coriolis like for profiling floats. Profiles are considered as vertical. - T and S outsiders based on historical data - Density inversions Dive #260 – “dirt“ in the conductivity cell are rejected + visual inspection Metadata: Vehicle name, project, PI Waypoint (heading) Angle of ascent/descent Target depth Climb depth Target altitude Time between surfacing Current correction

Conclusions/Questions • Publicly available data in NRT • (a few mn after surfacing) • mail / ftp to push data on Coriolis ? • kermit/dockserver – Security issues ? – 1 GS / 1 glider or 1 GS / N gliders ? – Include Email notification in Kermit sessions ?

N gliders / 1 GS 1 glider / 1 GS phones lines Email server GS GS Backup data/system Web server

Deployment and recovery tools