Receive Beamformer• Combines conditioned transducer signals toform beams• Each beam acts as a spatial filter• Uses beam shading and beam steering to formbeam sets• Each receive beam processed in its ownchannel• Typical beam types:– Multiple narrow detection beams– Sum-difference beams– Offset phase center beams 31Applied Research LaboratoryReceiver Channels• Each receive beam has a receiver channel• Receiver channel functions:– Band pass filtering– Gain control (historic progression in order ofsophistication)• Fixed gain• Time varying gain• Automatic gain control– Detection processing within the angular space thatdefines that channel

Pre-amplification
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