JuliaSpaceMissionDesign Ecosystem

Open-source Julia packages for space mission analysis and design. Org: JuliaSpaceMissionDesign

Package Dependency Graph

JSMDInterfaces.jl (abstract types, @interface macro)
├── JSMDUtils.jl (math, file I/O, AD wrappers)
├── SMDGraphs.jl (graph data structures via Graphs.jl)
├── Tempo.jl (timescales, Epoch type)
├── Ephemerides.jl (SPK/PCK kernel reader)
├── CalcephEphemeris.jl (CALCEPH wrapper)
├── IERSConventions.jl (Earth orientation, precession, nutation)
├── AstroModels.jl (force models: gravity, SRP, drag)
└── FrameTransformations.jl (frame graph, state transformations)

Shared Design Patterns

• Order-parameterized: All computations use vector3/6/9/12 and rotation3/6/9/12 for position through jerk (up to 4th order)
• Graph-based: Frames and timescales are directed graphs with automatic path-finding
• AD-compatible: ForwardDiff via JSMDDiffTag and FunctionWrappersWrapper with pre-baked dual-number types
• Allocation-free: StaticArrays, FunctionWrappers, PreallocationTools throughout
• NAIF IDs: Integer body/frame identifiers (399=Earth, 301=Moon, etc.)
• Time: Seconds since J2000 (TDB by default) via Tempo.Epoch

JSMDInterfaces.jl (Foundation)

Defines abstract types and interface stubs via @interface macro:

• JSMDInterfaces.Frames: vector3/6/9/12, rotation3/6/9/12
• JSMDInterfaces.Ephemeris: ephem_compute!, ephem_orient!, AbstractEphemerisProvider
• JSMDInterfaces.Graph: add_vertex!, add_edge!, get_path, has_path
• JSMDInterfaces.Models: parse_data, parse_model, compute_acceleration
• JSMDInterfaces.Bodies: body_rotational_elements + derivatives

JSMDUtils.jl (Utilities)

• Math: unitvec, cross3/6/9/12, angle conversions, Akima spline interpolation, rotation derivative helpers (angle_to_δdcm, skew)
• AD: derivative, gradient!, jacobian!, hessian! wrappers around ForwardDiff
• File I/O: JSON, YAML, TXT file type wrappers with load()

SMDGraphs.jl (Graph Infrastructure)

Lightweight wrappers around Graphs.jl implementing the JSMDInterfaces.Graph interface. Provides MappedGraphs with Dijkstra path-finding used by Tempo and FrameTransformations.