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  1. OMG Specification

CubeSat System Reference Model Profile — Open Issues

  • Acronym: CSRM
  • Issues Count: 5
  • Description: Issues not resolved
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Issues Descriptions

Recommended Additions

  • Key: CSRM11-4
  • Status: open  
  • Source: Dassault Systemes ( Daniel Brookshier)
  • Summary:

    To make the case for updating CSRM stereotypes. Once agreement is reached, updates to the CSRM Specification will be developed.
    This is a big deal and needs lots of discussion.

    Figures 1 lists CSRM element stereotypes. Black font denotes current baseline as captured in the normative CSRM Profile. Blue font denotes recommended additions.

    Figure 2 lists requirement elements related properties that are part of the SysML language.

    Figure 3 illustrates one of many ways to establish relationships between the mission stakeholders, requirements, technical measures, and use cases stereotypes. These stereotypes are denoted by italicized font in Figure 1.
    The relationships are captured in the element specifications and are displayed and maintained in diagrams and tables as shown in Figure 1.
    Object Constraint Language

    There has been discussion about codifying the allowable relationships using Object Constraint Language (OCL). OCL is a declarative language describing rules applying to Unified Modeling Language (UML) models. For example, a refine relationship can exist between a requirement. and any other model element, whereas a derive relationship can only exist between requirements.

    That could be done founded on the examples in Figure 3. This would be of limited benefit. A mission team will be using the stereotypes and relationships best suited to their mission and the stereotypes in Figure 3 are very limited as compared to Figure 1.

    A case could be made to established relationships for the stereotypes in Figure 1. But that is out-of-Scope for the SSWG CSRM effort.

    An Issue that Needs Resolution.

    The intent of defining addition stereotypes as shown in Figure 1 is to provide stereotypes for a variety of mission architectures. However, several of the stereotypes are identified as CubeSat stereotypes. But they are not unique to CubeSats. The only thing that makes a model a CubeSat model is the incorporation of a CubeSat form factor such as the Cal Poly CubeSat Design Specification.

    My recommendation is to rename the stereotypes as show in Table 1 below.

    Table 1. Renaming of Stereotypes (Proposed name changes from Figure 1)
    CubeSatRequirement SatelliteRequirement
    CubeSatSubsystemRequirement SatelliteSubsystemRequirement
    CubeSatComponentRequirement SatelliteComponentRequirement
    CubeSatUseCase SatelliteUseCase
    CubeSatSubsystemUseCase SatelliteSubsystemUseCase

  • Reported: CSRM 1.0a1 — Thu, 21 Apr 2022 20:21 GMT
  • Updated: Thu, 9 Nov 2023 01:06 GMT
  • Attachments:

Icons for profile

  • Key: CSRM11-1
  • Status: open  
  • Source: Dassault Systemes ( Daniel Brookshier)
  • Summary:

    The original icons used for stereotypes in the profile were drafts and need to be replaced with better versions. The icons also need to be delivered as SVG.

    The document does not currently show these icons, so diagrams need to be updated or an appendix added to the icons.

  • Reported: CSRM 1.0b1 — Fri, 18 Mar 2022 21:30 GMT
  • Updated: Thu, 9 Nov 2023 01:06 GMT

Add constraints to aid in correctness of profile useage

  • Key: CSRM11-2
  • Status: open  
  • Source: Dassault Systemes ( Daniel Brookshier)
  • Summary:

    Constraints should be added to aid in the creating of correct models. For example, an MoE needs to be related to a moeRequirement which in turn is refined by a moeSpecification.

    In addition, by categorization and content of warings and error of the constraints, we could add hints for new users of minimal and advanced concepts.

  • Reported: CSRM 1.0b1 — Fri, 18 Mar 2022 22:00 GMT
  • Updated: Thu, 9 Nov 2023 01:06 GMT

Create examples of use of the profile

  • Key: CSRM11-3
  • Status: open  
  • Source: Dassault Systemes ( Daniel Brookshier)
  • Summary:

    Originally the first versions of CSRM had examples. However, when the spec was reduced to a profile, the examples were removed. Because of some of the changes, not all examples are viable, so it is proposed we create new examples. Dave Kaslow also requested that the examples be categorized as a simplified and expert use of the profile to aid adoption by students.

  • Reported: CSRM 1.0b1 — Fri, 18 Mar 2022 22:08 GMT
  • Updated: Thu, 9 Nov 2023 01:06 GMT
  • Attachments: