Concepts for remote control of VLBI-telescopes and first experiences at Wettzell

Transkript

1 Concepts for remote control of VLBI-telescopes and first experiences at Wettzell (FESG) Martin Ettl (FESG), Reinhard Zeitlhöfler (FESG), Reiner Dassing (BKG), Hayo Hase (BKG), Matthias Mühlbauer (BKG), Christian Plötz (BKG), Sergio Sobarzo (UdeC), Cristian Herrera (UdeC), Walter Alef (MPIfR), Helge Rottmann (MPIfR), Ed Himwich (NASA/GSFC/NVI) 1

2 The Radiotelescope Wettzell (RTW), it s team and partner sites RT Wettzell/Germany TIGO Concepción/Chile GARS O Higgins/Antarctica The Wettzell VLBI crew (from left to right): Ch. Plötz, E. Bauernfeind, G. Kronschnabl, R. Schatz, W. Schwarz, R. Zeitlhöfler, A. Neidhardt (missing in picture: E. Bielmeier). 2 And in the future: TTW Wettzell

3 Wettzell and the idea of controlling VLBI telescopes by remote 3

4 The idea: remote attendance and control of VLBI telescopes Wettzell, O Higgins/Antarctica and TIGO/Concepción RT Wettzell/ Germany TIGO Concepción/Chile 4 GARS O Higgins/Antarctica

5 The idea: remote attendance and control of VLBI telescopes Wettzell, O Higgins/Antarctica and TIGO/Concepción Remote Control on Site RT Wettzell/ Germany TTW Wettzell/ Germany TIGO Concepción/Chile 5 GARS O Higgins/Antarctica

6 The idea: remote attendance and control of VLBI telescopes Wettzell, O Higgins/Antarctica and TIGO/Concepción Presentation & user interface code Device control code Communication code Idea of a strict design-separation of these parts 6

7 e-control Technische Universität München The idea: remote attendance and control of VLBI telescopes Wettzell, O Higgins/Antarctica and TIGO/Concepción FS Monitor Client GUI FS Monitor Client Communication Network Graphical User Interface (GUI) Client Communication FS Monitor Server Communication FS Monitor Server Functionality FS Monitor FS Server functionality 7

8 The communication with a remote procedure call middleware and ssh FS Monitor Client GUI FS Monitor Client Communication Network FS Monitor Server Communication FS Monitor Server Functionality FS Monitor FS 8

9 The communication with a remote procedure call middleware Application 1 Application 2 Application n Client Distribution runs platform 1. RPC- Call Server waits Operating System 1 Architecture 1 Client waits Operating System 2 Client runs Architecture 2 4. RPC- Return 3. Procedure- Return Operating System n Server waits 2. Procedure- Call Server runs Architecture n Transportation Transportation [SAX07]: Saxonia Systems: Remote Procedure Call, Download [PUD01]: Puder, Arno; Römer, Kay: Middleware für vereteilte Systeme, 1.Auflage, dpunkt.verlag GmbH Heidelberg

10 Communication is generated Technische Universität München The communication using a middleware generator 10

11 The communication using a middleware generator fsmc.idl Step 1: Write interface definition for fsmc idl2rpc.pl fsmc.idl Step 2: Call idl2rpc.pl to generate communication code Step 4: Write code for data presentation FS GUI (wxwidgets) Automatically generated communication code FSconnection code Step 3: Write code to connect to fieldsystem g++ Step 5: Compile g++ Graphical User Interface (GUI) Command line shell Web Interface fsmc Client fsmc Server 11

12 The communication ssh - tunneling 12

13 A fieldsystem extension remote accessible, autonomous process cells FS Monitor Client GUI FS Monitor Client Communication Network FS Monitor Server Communication FS Monitor Server Functionality FS Monitor FS 13

14 A fieldsystem extension autonomous process cells Autonomous process cell offers remote fieldsystem monitoring Simple Log Access Fieldsystem Watchdog- (Father-) Process Activation Own code FS Shared Memory Memory Request Automatic Safety Device Request Own code SNAP System Call Must be written by user Remote User Interface Command line, wxwidgets, Browser, Strict design-separation of - Device control code - Generated communication code - Presentation & user interface code 14

15 A fieldsystem client remote (graphical) user interface FS Monitor Client GUI FS Monitor Client Communication Network FS Monitor Server Communication FS Monitor Server Functionality FS Monitor FS 15

16 A fieldsystem client graphical, textual or browser based Separation of control and presentation logic Interchangeability of presentation layer (console shell (ncurses), graphical user interface (wxwidgets), web access via Browser, web service, ) Remote controllable via client-server-architecture on idl2rpc-middleware Modularity in window units and additionaly possible, separately created administration user interfaces for each device Basis for graphical user interface: wxwidgets (C++ based Open- Source-Framework for plattform indefendent developement of graphical user interfaces) 16 Webcam

17 The first tests Wettzell, O Higgins and TIGO go remote FS Monitor Client GUI FS Monitor Client Communication Network FS Monitor Server Communication FS Monitor Server Functionality FS Monitor FS 17

18 02-Nov :29:50 02-Nov :29:41 Firewall Technische Universität München The first tests Radiotelescope Wettzell (RTW)/Germany ssh to firewall ssh to fieldsystem Internet RPC 18

19 18-Nov :29:55 19-Nov :26:34 19-Nov :59:50 20-Nov :49:09 Firewall Router Technische Universität München The first tests GARS O Higgins/Antarctica ssh to fieldsystem Internet RPC ohig60oh ohig61oh sshproblems sshproblems sshproblems 19 Strong snowfall

20 18-Nov :29:55 19-Nov :26:34 19-Nov :59:50 20-Nov :49:09 Firewall Router Technische Universität München The first tests TIGO Concepción/Chile ssh to fieldsystem Internet RPC ohig60oh ohig61oh sshproblems 20

21 Adding new devices to the fieldsystem FS Monitor Client GUI FS Monitor Client Communication Network FS Monitor Server Communication FS Monitor Server Functionality FS Monitor FS 21

22 Adding new devices to the fieldsystem FS Monitor Client GUI FS Monitor Client Communication Network FS Monitor Server Communication FS Monitor Server Functionality FS Monitor FS DBBC Client GUI DBBC Client Communication Network DBBC Server Communication DBBC Server Functionality 22 DBBC Hardware

23 Adding new devices to the fieldsystem FS Monitor Client GUI FS Monitor Client Communication Network FS Monitor Server Communication FS Monitor Server Functionality FS Monitor FS DBBC Client Com. DBBC Client GUI DBBC Client Communication Network DBBC Server Communication DBBC Server Functionality 23 DBBC Hardware

24 e.g. DBBC Adding new devices to the fieldsystem DBBC (INAF) 24

25 A fieldsystem extension remote controlled, autonomous devices e.g. DBBC (but at the moment only Linux and on field system side C++ is supported) dbbc.idl Step 1: Write interface definition for DBBC idl2rpc.pl dbbc.idl Step 2: Call idl2rpc.pl to generate communication code Step 4: Write code to connect to field system Integrationmodul into FS (C++ adapter) Automatically generated communication code DBBC- Hardwareconnection code Step 3: Write code to connect hardware g++ Step 5: Compile g++ Fieldsystem DBBC Client DBBC Server 25

26 e.g. DBBC (Reinhard Zeitlhöfler) Parallel FS integration in classical style Abstract - A command set for the DBBC controlling is defined in the IRA-INAF Technical Report DBBC Management Command Set. - This command set is implemented as Field System Snap Commands in the station programs (user2/st) at Wettzell. - First experiences with connections from Field System to DBBC for tests and developing. DBBC Command Implementation in the Field System Software - According to the description commands are defined in the control file user2/stcmd.ctl to be known to the Field System as Snap Commands. - The program user2/stqkr/stqkr.c calls the corresponding functions for parsing, and if inputs are accepted, for sending to the server (DBBC) using TCP,IP protocol over standard text sockets. - At the moment the server is just a simulation program running also on FS-PC. - Suggestions are made to change parts of the DBBC command implementation and to think about ASCII data handshake replys 26

27 A future concept Combined control of different systems in a geodetic observatory 27

28 Combining ideas e.g. combined control of different systems in a geodetic observatory Think about optimizing work flows Increasing the number of observations with e-control (automation and remote attendance/control Time sharing of measuring equipment Just-on-time scheduling and updating to adapt flexible observation programs Additional integrated safdety system(s) Standardization of system software BUT: There will be allways situations where highly educated personnel must be at the observatories RTW TTW1 TTW2 OHIGGINS TIGO SOSW WLRS Datacenter Think about the technical realisations of GGOS? icture similar to: Hase, Hayo; et. al.: Twin Telescope Wettzell (TTW) - a VLBI2010 Radio Telescope Project. IVS General Meeting

29 Thank you! And this is a lucky remote observer in his private home observatory controlling the radiotelescope Wettzell immediatly after waking up! 29