July 4, 2016

RLGS SONC

RLGS's SONC
 

SONC CentRE Supervision

This function is in charge of the supervision of:

  • the SONC operations (operations scheduling, computer health monitoring, etc.),
  • and the operations with the external interfaces (LCC, RMOC, RSOC, PIs and SLD support laboratory).

SONC Public Relation

This function will be in charge of displaying to the public the main results/operations/information of the project.

Rosetta trajectory display:
RMOC is in charge of the Rosetta navigation. It is interesting for the Rosetta Lander community and the public to have information on where the probe is during the cruise phase, around the comet, etc. It is in charge of:

  • Processing the Rosetta navigation information (adding some information such as the Lander's position),
  • Displaying this information,
  • Providing access to the scientific community.

SDL Parameter Definition and Reconstitution

The SONC will perform:

  • the description of the possible landing sites,
  • the separation/descent/landing trajectory definition,
  • the localization of the actual landing site.

Description of the possible landing sites

The Rosetta orbiter performs a global and close mapping of the candidate and final sites. The SONC will be in charge of:

  • displaying and analyzing the images of possible landing sites from the Rosetta images processing results or coming from the ESA centres.

Separation/Descent/Landing trajectory definition

The SONC will determine strategies for the Rosetta Lander separation, descent and landing taking into account Orbiter and Lander constraints as well as comet characteristics. The function is divided into:

  • Orbiter data calibration and processing in order to obtain comet characteristics and models as well as site models (from PIs and SDL support laboratories),
  • comet characteristics and models (coming from PIs'laboratories, RGS centres, SDL support laboratories (GRGS)),
  • numerical processing to define separation, descent and landing strategies and the associated parameters (e.g. delta V) (the separation strategy has to be approved by ESA).

The outputs of this function, sent to the RMOC and the LCC, are the landing site parameters, mainly:

  • Rosetta spacecraft orbit and attitude at delivery,
  • descent strategy (MSS Delta V value, ADS delta V value, desired landed attitude) and schedule.

Localization of the actual landing site

After landing, the real landing site has to be located mainly for operational purposes (to refine operational data for the second sequence).
It is planned to display and analyze the images of the actual site coming from the Rosetta Lander experiments (panoramic images).

Lander Experiment Data Processing

Lander experiment telemetry processing (level 0)

The SONC will be in charge of:

  • sorting the SFDU per experiment (one APID per experiment),
  • sorting the experiment telemetry per types: housekeeping or scientific,
  • producing the telemetry level 0 for each experiment (adding the necessary auxiliary data).

Lander experiment data processing (level 1)

After the level 0 processing, the SONC is in charge of producing the level 1 data for the experiments that require it.

It consists in applying instrument transfer function to get physical parameters (images, housekeeping, science, etc.). These processes will be done systematically or upon PI request.

The format of the level 1 products is to be defined (for example: FITS).

Lander experiments quick-look monitoring

During the different phases, a quick look on different types of data (science, housekeeping or parameters) will be performed.

This function displays and monitors the parameters, elaborating Lander experiment status and writing a Lander payload quick-look status report.

Scientific Experiment Operations Plan DEVELOPMENT

There are two types of operations, namely scientific and monitoring operations.

During cruise, mainly monitoring operations are performed. They are uploaded when an active phase occurs.

When the Lander arrives at the Comet, it will perform mainly scientific operations. A preliminary plan based on the current knowledge of the comet will be loaded on board the Lander at launch. When arriving near the comet and after the landing site selection, the experiments may need fine-tuning of their pre-loaded operations .

In both cases, the experiment operations must respect the resources allocated.

The LCC allocates resources (power, energy and data volume) to the payload taking into account the objectives set by the Rosetta Lander Project. The function:

  • updates the data related to the scientific operations (tasks, constraints, resources, etc.) for each experiment,
  • inside the resources allocated by the LCC, defines the scientific scenarios with the associated constraints (orbiter parallel operations, duration, etc.), taking into account experiment status,
  • elaborates the Rosetta Lander experiment plan under macro-command format.

Lander Knowledge Management

The Rosetta mission is very long (nearly 15 years between the design and the end of the operations), very complex, geographically deployed, operations are not continuous (long hibernation phases last several months, if not years).

Therefore, knowledge of the project must be collected and kept project during all these years.

This function is in charge of:

  • collecting the project knowledge (documents, mails, etc.),
  • giving access to this project knowledge.

Data Acquisition and Transmission

This function is in charge of the SONC operational interfaces. It is responsible for:

  • acquiring the data sent by the other operational centres: LCC (Lander experiment resources, Lander status), RMOC (Rosetta Lander scientific telemetry, auxiliary data), RSOC (Rosetta experiment plan), SDL support laboratories (comet models),
  • transmitting data (operation plan, scientific status, etc.) to the other operational centres: LCC (Lander experiments operation plan), RMOC (Rosetta Lander site parameters), RSOC (Rosetta experiments plan),
  • managing all the telecommunication means (datalinks, video, audio, etc.) to support the operational co-ordination with the other centres.

Lander scientific User Services

The SONC will be the interface with the Rosetta Lander community. It will offer the following services:

  • access to the Rosetta Lander scientific health, the scientific products (raw, level 0, 1),
  • quick-look processing request,
  • scientific operations request,
  • etc.

All these services will be protected with an access code for each user. All users will not have access to all the services.

For high phases, Lander scientists must be co-located at the SONC.

Lander Data Archiving

All the data and information produced and received by the SONC are archived during the whole mission (nearly 11 years). The main ones are:

  • Lander telemetry (raw and processed),
  • quick-look results,
  • scientific status,
  • Lander experiment operations plan,
  • landing site parameters,
  • etc.

The archiving is done automatically. The corresponding catalogue (describing the products archived and available) is updated and maintained all along the mission.

The access to the archived products is possible by requests addressed through the user services.

This data base must be compatible with the LCC one.

After a certain period (6 to 12 months), the Lander calibrated data must be provided in PDS format (Planetary Data Structure) to RSOC for public access.