New Generation of ESA Telemetry and Telecommand System

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New Generation of ESA Telemetry and Telecommand
System

• Y.Doat, M.di Giulio, G.P.Calzolari
• ESA/ESOC
• SpaceOps 2004

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Introduction

• The TM and TC System
• Provides SLE services to the Users.
• Will be installed in all the Ground Stations of
  the ESAs Network (ESTRACK).
• Implements SLE services that will ensure
  inter-operability of the ESA stations with the
  Control Centres of other organizations.

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SLE Transfer Services
Space Link Extension (SLE) transfer services Set
of services required to access the space link
formats in a uniform way.

• The SLE Services include two major elements
• transfer services that move space link data units
  between ground stations, control centres and
  end-user facilities
• management services that control the scheduling
  and provisioning of the transfer services.
• The SLE Services operate in two phases
• Definition phase (management activities)
• Utilization phase, (data transfer).

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Return SLE Transfer Services

• Return All Frames (RAF) complete set of TM
  frames from a single space link symbol stream
• Return Channel Frames (RCF) Master Channel (MC)
  or specific Virtual Channels (VC) extracted from
  a particular RAF channel
• Return Frame Secondary Header (RFSH) MC or VC
  Frame Secondary Headers (FSH) extracted from a
  R-AF channel
• Return Operational Control Field (R-OCF) MC or
  VC Operational Control Fields (OCF) extracted
  from an R-AF channel
• Return Space Packet (RSP) retrieves packets with
  selected Application Process Identifiers (APID)
  from one spacecraft VC

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Return Data Transfer Interface
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Forward SLE Transfer Services

• Forward Command Link Transmission Unit (F-CLTU)
  users provide CLTUs for uplink to the spacecraft.
  
• Forward Telecommand Frames (FTCF) users supply
  TC frames to be encoded into CLTU ready for
  uplink
• Forward Telecommand Virtual Channel Access
  (FTCVCA) users provide complete VCs for uplink
• Forward Space Packets (FSP) users provide
  packets for uplink to a spacecraft without the
  need to coordinate with other users of the
  spacecraft

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Forward Data Transfer Interface
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The SLE Application Program Interface (API)

• ESA in collaboration with industry have designed
  an Application Program Interface (API)
• It isolates the SLE application from the specific
  characteristics of a given middleware
• It offers a standard communication service to the
  SLE application in the form of a set of standard
  functions
• The ESA Control Center will connect to the ESA
  Ground Stations via TCP/IP.

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The MC Application Program Interface (API)

• ESA in collaboration with industry have designed
  an Application Program Interface (API)
• It isolates the TMTCS application from the
  specific characteristics of the ESA MC
• The TMTCS is not affected by the technology used
  for monitoring and control
• The ESA Central Ground-Station Monitoring and
  Control system will connect to the TMTCS via
  CORBA.

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System Overview 1

• The TMTCS consists of 2 main blocks TPS and TCS.
• Initial Telemetry Processor (TPS) Services
• Return All Frames (RAF)
• Return Channel Frames (RCF)
• Return Operational Control Field (OCF).
• Initial Telecommand System (TCS) Services
• Forward CLTU
• Forward Space Packet (FSP)

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System Overview - 2

• 1. SLE service Provision
• Service scheduling (e.g., service start and stop
  times)
• User characteristics (e.g., events notified to
  the User).
• Configuration of Service Provision is achieved
  through Service Instances .
• 2. SLE Service Production
• Actual processing and transmission of TM and TC
  data units
• TM production
• TC production.

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System Overview - 3
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Configuration of an SLE Service Providerthe
Service Instances

• SLE transfer services need to be
• Scheduled
• Configured
• Controlled
• Monitored.
• Service provisioning by means of Service
  Instances (SI)
• TM provisioning includes on-line and off-line SIs
• TC provisioning on-line SIs

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Configuration of an SLE Service Providerthe
Spacecraft Session

• CCSDS Space Link Session a continuous period
  during which an SLE system provides the
  capability to use one or more physical channels
  on a space link.
• The Space Link Session is a matter of general
  ground station management. It is handled by the
  Complex Manager.
• The TMTCS supports Forward/Return Spacecraft
  Session a continuous period during which the
  TMTCS is fully configured with the parameters of
  a given spacecraft

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Service Instances and Spacecraft Sessions
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Subsystem Units and Basic States

• TCS and TPS are defined as two independent
  Sub-System Units of the TMTCS (the System).
• Each SSU has own Basic States Set-up and
  Operable.
• Provision of Return Services may take place
  during reconfiguration of Forward Services
  production, or vice-versa .
• In Basic State Operable
• the TPS can always supports service production
  for offline delivery mode.
• the TPS/TCS support service production for online
  delivery mode only during the Forward / Return
  Spacecraft Session.

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Spacecraft Session and SSU Basic States
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Monitoring and Control aspects of the TMTCS

• Main elements of the TMTCS database
• Variable Lists about Armed Service Instances.
• Variable Lists about Installed Service
  Instances.
• parameters of the Forward/Return Spacecraft
  Sessions. (either the on-going or to the
  next-scheduled Session).
• all the parameters of the System (TMTCS) and
  Subsystem Units (TPS and TCS).

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Telemetry Processing characteristics - 1

• Supported SLE Services
• Return All Frames
• Return Channel Frames
• Return MC-OCF.
• Supported Standards
• CCSDS Packet TM Standard
• CCSDS AOS Standard
• ESA PCM TM Standard.

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Telemetry Processing characteristics -2

• Data Storage for retrieval of
• Telemetry Frames
• Telemetry Frame Operational Control Field
• Data Storage structured according to Nodes and
  Folders, each corresponding to a Spacecraft
  Session for each given Spacecraft.
• Data Storage of at least 50 GBytes of user data
  (i.e., Telemetry Frames without overheads due to
  annotations, directory structures, etc.) on the
  hard disk.

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Required TPS Performances
15 SLE Users Connected
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Telecommand Processing characteristics

• Supported SLE Services
• Forward CLTU
• Forward Space Packet.
• Supported Standards
• CCSDS Packet TC Standard
• ESA PCM TC Standard (through CLTU).
• TC Data Storage

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TCS Performances

• Uplink bit rate of up to 256k bits/second.
• Multi User support
• FSP Service Maximum of 20 Forward Sis Bound at
  a time
• CLTU Service Maximum of 1 Forward SIs Bound at
  a time

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Few more considerations

• Pure software machine (data modulation/demodulatio
  n is performed by other equipment).
• Developed on a single Workstation on Solaris 8
• Will be ported to Linux.

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QUESTIONS
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THANK YOU