What is boost phase?

Boost Phase

The boost phase is the portion of the flight of a ballistic missile or space vehicle during which the booster and sustainer engines operate until it reaches peak velocity. This phase can take 3 to 4 minutes (for a solid rocket shorter than for a liquid-propellant rocket), the altitude at the end of this phase is 150–200 km, and the typical burn-out speed is 7 km/s. Boost-phase intercept is a type of missile defense technology that would be designed to disable enemy missiles while they are still in the boost phase.

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Missile Defense Categories - Trajectory Phase - Boost Phase
... Decoys cannot be used during boost phase ... to geographically position interceptors to intercept missiles in boost phase (not always possible without flying over hostile territory) ...
Boost Phase
... The boost phase is the portion of the flight of a ballistic missile or space vehicle during which the booster and sustainer engines operate until it reaches peak velocity ... This phase can take 3 to 4 minutes (for a solid rocket shorter than for a liquid-propellant rocket), the altitude at the end of this phase is 150–200 km, and the typical burn-out speed is 7 km/s ... Boost-phase intercept is a type of missile defense technology that would be designed to disable enemy missiles while they are still in the boost phase ...

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