Bloodhound System
Bloodhound Semi-Active Homing - Basic Principles
Pete Murray
Target Acquisition and Missile Launch

At the end of the boost phase, the missile receiver locks onto the reflected signal.  The missile then commences navigation in bearing while flying a pre-programmed climb/cruise trajectory in pitch.
Transition from Climb/Cruise to Terminal Homing
The missile remains locked to the reflected signal and continuously tracks the target. At the appropriate moment, the missile is commanded to exit the climb/cruise programme and navigate to the intercept point.
At interception, the radar proximity fuze detonates the warhead.