Adam Chapman
2008-05-13 18:28:22 UTC
Hello,
First of all sorry if this is off topic, I couldn't find a group on
radar.
I was wondering why radar guided missiles use such a high frequency.
Looking at a graph I have showing atmoshperic absorbtion of radar
waves; there are two very high peaks (indicating high absorption) at
60GHz and 120GHz. This is due to resonant frequencies of atmospheric
molecules. The hellfire missile's radar seeker operates at 94GHz and
the
Apache Helicopter uses a 35GHz radar. Absorption at the helicopter's
and missile's frecuencies is fairly similar so it can't be anything
to
do will design operating range.
It must be something to do with either antenna size or resolution,
but
no idea which or why. Can anybody please point me in thre right
direction?
Thanks for any help
Adam
First of all sorry if this is off topic, I couldn't find a group on
radar.
I was wondering why radar guided missiles use such a high frequency.
Looking at a graph I have showing atmoshperic absorbtion of radar
waves; there are two very high peaks (indicating high absorption) at
60GHz and 120GHz. This is due to resonant frequencies of atmospheric
molecules. The hellfire missile's radar seeker operates at 94GHz and
the
Apache Helicopter uses a 35GHz radar. Absorption at the helicopter's
and missile's frecuencies is fairly similar so it can't be anything
to
do will design operating range.
It must be something to do with either antenna size or resolution,
but
no idea which or why. Can anybody please point me in thre right
direction?
Thanks for any help
Adam