From inertial measurement units to autonomous flight-safety systems — explore the avionics that make precision spaceflight possible, and the guidance algorithms, radiation hardening, and redundant architectures behind them.

Avionics handle guidance, navigation, and control (GNC) — knowing where the rocket is, where it should be, and how to steer there. An inertial measurement unit of accelerometers and gyroscopes senses every change in motion thousands of times a second; modern vehicles fuse it with GPS so position drift stays small all the way to orbit. The flight computer turns that picture into commands — gimballing engines and firing thrusters — closing the loop continuously from liftoff to spacecraft separation.

Space is unforgiving of electronics, so the designs build in margin. Critical computers are radiation-hardened (chips like the RAD750 keep running through cosmic rays and solar particles that would crash ordinary processors), and they are often redundant and voting — Falcon 9 flies triple-redundant strings of processors that cross-check each other so any single faulty result is outvoted. A modern addition is the Autonomous Flight Safety System: an onboard computer that can terminate a rocket straying off course without a human range-safety officer, which is part of how SpaceX flies and lands so often at lower cost.