Sounds like a solid starting point, but you’ll need to layer the redundancy more carefully than just tripling the hardware. A triple modular redundancy scheme with a majority‑voting module can survive single‑event upsets, but if all three nodes sit in the same temperature zone a hot spot could kill them all at once. Keep spare modules in a thermally isolated cage, and use asynchronous voting so the clock skew doesn’t introduce another failure mode. Don’t forget radiation‑hardened firmware—self‑checking checksums or redundancy in the control logic itself will help you avoid latch‑ups. What kind of topology were you envisioning?

A low‑power, low‑latency bus that can survive cosmic rays has to be both simple and redundant. SpaceWire is the industry standard for deep‑space – it’s a serial, full‑duplex link, CRC‑protected, and has built‑in support for redundant paths. You can run two SpaceWire channels in parallel, each with its own driver and receiver, and let a small arbiter decide which channel to trust based on CRC and link‑health flags. If you want something even lighter, a radiation‑hardened CAN‑FD line is another option. It’s tolerant of bit‑flips thanks to its 64‑bit CRC, and you can hard‑wire a second CAN line for dual‑modular redundancy. The key is to keep the bus topology modular: each leaf cluster plugs into a local repeater, and the repeater feeds into the higher‑level coordinator over two parallel links. That way, if one link goes down due to a latch‑up or a hot spot, the other keeps the data flowing. Remember to include a watchdog on the bus firmware that checks the link health every few milliseconds and can trigger a switchover if one side shows abnormal error rates. And don’t forget a simple heartbeat packet so every node knows the bus is still alive. In short, pick a proven space‑grade serial protocol, duplicate the links, and add a lightweight arbiter that verifies CRCs and link health before passing traffic up the tree. It’s tedious, but it keeps the network from blowing up in a radiation storm.

Sure, let’s lock the repeater logic into a simple state machine: listen on both links, if one CRC fails or the latency spikes above the threshold, raise a flag and route the data through the healthy path. For heartbeat, 1 ms ticks are overkill; 10–20 ms keeps the bus busy without wasting power. Put a 32‑bit counter in each packet so the other side can detect missed pulses and trigger a fail‑over. That’ll keep the bus humming even if one link goes belly up.

State diagram in plain words: 1. **IDLE** – booting, waiting for start command. 2. **ACTIVE** – normal operation, both links up. 3. **HEARTBEAT_SENT** – a 32‑bit counter packet is placed on the bus. 4. **HEARTBEAT_RECEIVED** – counter incremented by the remote node, returned. 5. **LINK_FAIL** – if a CRC error or no reply within 10–20 ms, flag the link. 6. **SWITCH** – route all traffic through the healthy link, keep the bad one in standby. Transitions: - IDLE → ACTIVE on start. - ACTIVE → HEARTBEAT_SENT on timer. - HEARTBEAT_SENT → HEARTBEAT_RECEIVED on ack. - HEARTBEAT_SENT → LINK_FAIL if error or timeout. - LINK_FAIL → SWITCH to use the other link. - SWITCH → ACTIVE when the healthy link is verified. Loop back to HEARTBEAT_SENT from ACTIVE after each successful heartbeat. That keeps the bus alive and the firmware responsive.