Difference between revisions of "Ground Segment and Operations"

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(The data flow in the Planck Ground Segment)
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== Geographical distribution of the Planck Ground Segment==
 
== Geographical distribution of the Planck Ground Segment==
  
The Planck Ground Segment consists of four geographically distributed centres:
+
The Planck Ground Segment consists of four geographically distributed centres.
  
 
=== The Mission Operations Centre ===
 
=== The Mission Operations Centre ===
 
The mission operations centre (MOC), located at ESA’s operations
 
The mission operations centre (MOC), located at ESA’s operations
centre in Darmstadt (Germany), is responsible for
+
centre in Darmstadt (Germany), was responsible for
 
all aspects of flight control and of the health and safety of the
 
all aspects of flight control and of the health and safety of the
Planck satellite, including both instruments. It plans and executes
+
Planck satellite, including both instruments. It planned and executed
 
all necessary satellite activities, including instrument
 
all necessary satellite activities, including instrument
 
commanding requests by the instrument operations centres.
 
commanding requests by the instrument operations centres.
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[[file:ESOC.jpg|thumb|200px|The European Space Operations Centre in Darmstadt, Germany, home of the Planck Mission Operations Centre.]]
 
[[file:ESOC.jpg|thumb|200px|The European Space Operations Centre in Darmstadt, Germany, home of the Planck Mission Operations Centre.]]
  
MOC communicates with the satellite using ESA’s 35-m antenna
+
MOC communicated with the satellite using ESA’s 35-m antenna
 
located in New Norcia (Australia), or that in Cebreros (Spain), over a daily 3-h period,
 
located in New Norcia (Australia), or that in Cebreros (Spain), over a daily 3-h period,
during which it uplinks a scheduled activity timeline
+
during which it uplinked a scheduled activity timeline
which is autonomously executed by the satellite, and downlinks
+
which was autonomously executed by the satellite, and downlinked
the science and housekeeping (HK) data acquired by the satellite during the past 24 h. The downlinked data are
+
the science and housekeeping (HK) data acquired by the satellite during the past 24 h. The downlinked data were
 
transferred from the antenna to the MOC over a period of
 
transferred from the antenna to the MOC over a period of
typically 8 h; at MOC they are put onto a data server from
+
typically 8 h; at MOC they were put onto a data server from
where they are retrieved by the two Data Processing Centres.
+
where they were retrieved by the two data processing centres.
  
 
=== The Planck Science Office ===
 
=== The Planck Science Office ===
  
[[file:ESAC_6.JPG|thumb|200px|The European Space Astronomy Centre in Villanueva de la Cañada, Madrid, Spain, see of the Planck Science Office.]]
+
[[file:ESAC_6.JPG|thumb|200px|The European Space Astronomy Centre in Villanueva de la Cañada, Madrid, Spain, site of the Planck Science Office.]]
  
 
The Planck Science Office (PSO) is located at ESA’s European Space Astronomy Centre in Villanueva de la Cañada surroundings (Madrid, Spain).
 
The Planck Science Office (PSO) is located at ESA’s European Space Astronomy Centre in Villanueva de la Cañada surroundings (Madrid, Spain).
Line 31: Line 31:
 
Its main responsibilities include:
 
Its main responsibilities include:
  
* Coordinating scientific operations of the Planck instruments;
+
* coordinating scientific operations of the Planck instruments;
  
* Designing, planning and executing the Planck observation strategy;
+
* designing, planning and executing the Planck observation strategy;
  
* Providing MOC with a detailed pointing plan with a periodicity of about one month;
+
* providing MOC with a detailed pointing plan with a periodicity of about one month;
  
* Creating and updating the specifications of the Planck Legacy Archive developed by the Science Archives Team at ESAC;
+
* creating and updating the specifications of the Planck Legacy Archive (PLA) developed by the Science Archives Team at ESAC;
  
* Testing and operating the PLA.
+
* testing and operating the PLA.
  
 
=== The LFI instrument operations and data-processing centre ===
 
=== The LFI instrument operations and data-processing centre ===
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=== The HFI instrument operations and data-processing centre ===
 
=== The HFI instrument operations and data-processing centre ===
 
The HFI instrument operations and data processing centres,
 
The HFI instrument operations and data processing centres,
located respectively at the Institut d’Astrophysique Spatiale
+
located, respectively, at the Institut d’Astrophysique Spatiale
 
in Orsay (France) and at the Institut d’Astrophysique de Paris
 
in Orsay (France) and at the Institut d’Astrophysique de Paris
 
(France), are similarly responsible for the operation of the HFI instrument, and (with several other institutes in
 
(France), are similarly responsible for the operation of the HFI instrument, and (with several other institutes in
Line 53: Line 53:
 
by HFI into the final scientific products of the mission.
 
by HFI into the final scientific products of the mission.
  
== The data flow in the Planck Ground Segment ==
+
== Data flow in the Planck Ground Segment ==
  
The PSO sends the Pre-Programmed Pointing Lists (PPL) to the MOC. The Flight Dynamics team at ESOC adapts them into Augmented Pre-Programmed Pointing Lists (APPL) taking into account ground station scheduling, Operational Day (OD) boundaries and other issues.
+
The PSO sent the Pre-Programmed Pointing Lists (PPL) to the MOC. The Flight Dynamics team at ESOC adapted them into Augmented Pre-Programmed Pointing Lists (APPL) taking into account ground station scheduling, Operational Day (OD) boundaries and other issues.
  
[[file:GS.jpg|thumb|200px|General schematics of European Space Agency Science Ground Segments. This picture exhibits the way ESA Ground Segments are generally organized.]]
+
[[file:GS.jpg|thumb|200px|General schematics of European Space Agency Science Ground Segments, showing how ESA Ground Segments are generally organized.]]
  
[[file:GSPlanck.JPG|thumb|200px|Specific schematics of the Planck Science Ground Segment. This picture exhibits the way the specific Planck Science Ground Segment works.]]
+
[[file:GSPlanck.JPG|thumb|200px|Specific schematics of the Planck Science Ground Segment, showing how the specific Planck Science Ground Segment worked.]]
  
MOC sends pointing and instrument commands to the spacecraft, and receives the house-keeping telemetry and science data through the ground stations (for Planck, mostly the New Norcia and Cebreros ones).
+
MOC sent pointing and instrument commands to the spacecraft, and received the house-keeping telemetry and science data through the ground stations (for Planck, mostly the New Norcia and Cebreros ones).
  
Science data is then transferred to both Data Processing Centres (DPC) which process the data and send quality reports to PSO.
+
Science data were then transferred to both data processing centres (DPCs), which processed the data and sent quality reports to PSO.
  
Science products (timelines, maps, etc) are regularly exchanged between DPCs in order to assist with calibration, systematics, and scientific issues.
+
Science products (timelines, maps, etc) have been regularly exchanged between DPCs in order to assist with calibration, systematics, and scientific issues.
  
 
More information about the Planck Ground Segment may be found in {{PlanckPapers|tauber2010a}}.
 
More information about the Planck Ground Segment may be found in {{PlanckPapers|tauber2010a}}.

Revision as of 01:39, 15 October 2014

Geographical distribution of the Planck Ground Segment[edit]

The Planck Ground Segment consists of four geographically distributed centres.

The Mission Operations Centre[edit]

The mission operations centre (MOC), located at ESA’s operations centre in Darmstadt (Germany), was responsible for all aspects of flight control and of the health and safety of the Planck satellite, including both instruments. It planned and executed all necessary satellite activities, including instrument commanding requests by the instrument operations centres.

The European Space Operations Centre in Darmstadt, Germany, home of the Planck Mission Operations Centre.

MOC communicated with the satellite using ESA’s 35-m antenna located in New Norcia (Australia), or that in Cebreros (Spain), over a daily 3-h period, during which it uplinked a scheduled activity timeline which was autonomously executed by the satellite, and downlinked the science and housekeeping (HK) data acquired by the satellite during the past 24 h. The downlinked data were transferred from the antenna to the MOC over a period of typically 8 h; at MOC they were put onto a data server from where they were retrieved by the two data processing centres.

The Planck Science Office[edit]

The European Space Astronomy Centre in Villanueva de la Cañada, Madrid, Spain, site of the Planck Science Office.

The Planck Science Office (PSO) is located at ESA’s European Space Astronomy Centre in Villanueva de la Cañada surroundings (Madrid, Spain).

Its main responsibilities include:

  • coordinating scientific operations of the Planck instruments;
  • designing, planning and executing the Planck observation strategy;
  • providing MOC with a detailed pointing plan with a periodicity of about one month;
  • creating and updating the specifications of the Planck Legacy Archive (PLA) developed by the Science Archives Team at ESAC;
  • testing and operating the PLA.

The LFI instrument operations and data-processing centre[edit]

The LFI instrument operations and data processing centre, located at the Osservatorio Astronomico di Trieste (Italy), is responsible for the operation of the LFI instrument, and the processing of the data acquired by LFI into the final scientific products of the mission.

The HFI instrument operations and data-processing centre[edit]

The HFI instrument operations and data processing centres, located, respectively, at the Institut d’Astrophysique Spatiale in Orsay (France) and at the Institut d’Astrophysique de Paris (France), are similarly responsible for the operation of the HFI instrument, and (with several other institutes in France and the UK) for the processing of the data acquired by HFI into the final scientific products of the mission.

Data flow in the Planck Ground Segment[edit]

The PSO sent the Pre-Programmed Pointing Lists (PPL) to the MOC. The Flight Dynamics team at ESOC adapted them into Augmented Pre-Programmed Pointing Lists (APPL) taking into account ground station scheduling, Operational Day (OD) boundaries and other issues.

General schematics of European Space Agency Science Ground Segments, showing how ESA Ground Segments are generally organized.
Specific schematics of the Planck Science Ground Segment, showing how the specific Planck Science Ground Segment worked.

MOC sent pointing and instrument commands to the spacecraft, and received the house-keeping telemetry and science data through the ground stations (for Planck, mostly the New Norcia and Cebreros ones).

Science data were then transferred to both data processing centres (DPCs), which processed the data and sent quality reports to PSO.

Science products (timelines, maps, etc) have been regularly exchanged between DPCs in order to assist with calibration, systematics, and scientific issues.

More information about the Planck Ground Segment may be found in Planck-PreLaunch-XI[1].

References[edit]

  1. Planck pre-launch status: The Planck mission, J. A. Tauber, N. Mandolesi, J.-L. Puget, T. Banos, M. Bersanelli, F. R. Bouchet, R. C. Butler, J. Charra, G. Crone, J. Dodsworth, et al., A&A, 520, A1+, (2010).

[ESA's] Mission Operation Center [Darmstadt, Germany]

European Space Agency

House Keeping

Planck Science Office

Planck Legacy Archive

(Planck) Low Frequency Instrument

(Planck) High Frequency Instrument

Pre-programmed Pointing List

European Space Operations Centre (Darmstadt)

Augmented Preprogrammed Pointing List

Operation Day definition is geometric visibility driven as it runs from the start of a DTCP (satellite Acquisition Of Signal) to the start of the next DTCP. Given the different ground stations and spacecraft will takes which station for how long, the OD duration varies but it is basically once a day.

[LFI meaning]: absolute calibration refers to the 0th order calibration for each channel, 1 single number, while the relative calibration refers to the component of the calibration that varies pointing period by pointing period.