Wollemi backplane strip

Wollemi

Private for now. The repository will be opened to the public once the design is complete. No licence has been applied yet; the plan (docs/licensing.md) is CERN-OHL-S-2.0 for hardware, Apache-2.0 for software and CC-BY-4.0 for documents. Analysis-level design only: no hardware exists, nothing here is qualified for flight, and every number is an engineering estimate.

Wollemi is an open, modular, fully documented small-satellite platform and a first mission built on it: a science-first, long-life 12U observatory with a tiered 50-year survival design. Everything is generated from configuration files and checked by tools, so a derived mission is a configuration change plus new cards.

Türkçe özet: Wollemi, açık kaynak, modüler bir küçük uydu platformu ve üzerine kurulu ilk görev: uzun ömürlü, bilim öncelikli 12U gözlemevi. Tasarım analiz düzeyinde tamamlandı (donanım yok); her sayı config dosyalarından üretilen araçlarla doğrulanıyor. Depo şimdilik özel, tasarım olgunlaşınca herkese açılacak.

Where things stand

The design is complete at analysis level: requirements, architecture, CAD with interference checks, power/thermal/attitude/orbit/structure analyses, protocol and firmware core with tests, electronics interface (KiCad, DRC clean), FMEA, test plan, operations concept, cost and schedule. Start with docs/sdd.md (system design document) and docs/status.md (latest regression). What is missing is physical: vendor data, schematics of the functional cards, prototypes, tests, a launch and an operator. See docs/plan.md, docs/risks.md and docs/cost.md.

Documentation

Repository layout

Quick start

pip install build123d cryptography sgp4       # CAD kernel, signing tests, orbit propagation (numpy, scipy, pillow come with build123d); KiCad 10 optional for DRC
python tools/check_all.py                     # runs every analysis and test, writes docs/status.md   (--quick skips CAD, thermal and the verification matrix)
python sim/trace_check.py                     # live requirements verification matrix
python mechanical/wollemi_cad.py               # full CAD assembly and checks, exports into mechanical/out/
python tools/gen_sdd.py                       # regenerate the system design document

Requires Python 3.11+ and GCC for the firmware and protocol tests. The sim/ tools use only the standard library unless noted.

Status and next steps

Design freeze candidate v0 at analysis level. The decisions that shape everything next: choose the target (flight mission, flight-quality reference design, or the precursor path with a FlatSat and a balloon flight), confirm the preferred orbit, and get vendor quotes and datasheets. Details in docs/sdd.md section 8.