Advanced

What is a model

Define architectural elements

The general architecture of the study model is based on the ECSS-E-TM-10-25 standard with the following components:

• One Top Element Definition (in bold),
• One Element Definition for each segment (Space, Ground, etc.)
• One or more Spacecraft/Platform
• One functional representation for each subsystem (details on this below),
• All other Element Definitions that describe the system (created during the CDF study)

Parameterise element parameters

Compose an architecture element

Parameter overrides

Redundancy modelling

Categorisation

When editing any Element Definition, it is possible to assign one or more category to it. The list of possible categories is quite extensive and most of the categories can be applied arbitrarily to better describe the Element Definition in question. That being said, there are a few categories that have a very specific role in the way COMET interprets the model. The following categorisation pattern must be followed for any standard CDF study:

Element Definition → Category

• Mission → Mission
  • Ground Segment → Segment
  • Launch Segment → Segment
  • Space Segment → Segment
    • Spacecraft → Systems, Elements
      • Functional Representations of Subsystems → Subsystems
      • Equipment → Equipment

This basic structure is expected by the COMET reporting tool when making a mass and power budget. The Systems and Elements categories must be handled with extra care. From the reporting tool’s “Preview” tab it will be possible to compute a report (mass/power budget) for any Element Definition categorised as both Systems and Elements listed at the highest level within the Space Segment Element Definition. For example, if there are two Element Definitions categorised as Systems and Elements within the Space Segment Element Definition, both will appear in the “Preview” tab of the reporting tool (assuming they have mass or power *Parameter Values* assigned to the equipment in them).

Element Definitions categorised as both Systems and Elements can also be nested. As mentioned, only Element Definitions categorised as Systems and Elements at the highest level will be selectable from the “Preview” tab in the reporting tool. Element Definitions categorised as Systems and Elements that are nested one level deep will be treated by COMET as “containers” and the budget will separate equipment by “container” (see image below).

Further nesting of Element Definitions categorised as Systems and Elements will be ignored and, in the mass/power budhets, all equipment nested at any further level will be placed on the same level. The budget will therefore still look like the image above.

Options

Finite States

Catalogues

Advanced subscription options

Domain specific extensions

Other COMET tools

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