> The diagram below shows the guidance system of the Minuteman III missile (1970). This guidance system contains over 17,000 electronic and mechanical parts, costing $510,000 (about $4.5 million in current dollars). The heart of the guidance system is the gyro stabilized platform, which uses gyroscopes and accelerometers to measure the missile's orientation and acceleration.
Even nuttier is the one from the Peacekeeper. Float a perfect beryllium sphere in fluorocarbon. Use thrusters to keep it oriented. No gimbal lock, because no gimbals. Six million dollars per unit, in 1987. So good that a system with literally perfect accuracy wouldn't improve accuracy, because error from the system was already well below other sources of inaccuracy in the missile. https://en.wikipedia.org/wiki/Advanced_Inertial_Reference_Sp...
I don't know specifically about Minuteman though a different ICBM uses inertial guidance but also does a star sight to calibrate at some point in its trajectory--says the Internet ahem. And, also yes, the modern inertial navigation that goes into all this is pretty amazing. The not so modern iteration of all this did get us to the moon in 1969.
> The diagram below shows the guidance system of the Minuteman III missile (1970). This guidance system contains over 17,000 electronic and mechanical parts, costing $510,000 (about $4.5 million in current dollars). The heart of the guidance system is the gyro stabilized platform, which uses gyroscopes and accelerometers to measure the missile's orientation and acceleration.