Bruce Rahn wrote:
Magnus Danielson wrote:
The directional antenna needs to have their directional lobes towards
each sat being tracked. If you try put the nulls towards the jammers
then you need to have a fair knowledge of where it is. If you direct
the loop, the side-loobs needs to be sufficiently suppressed. A single
jammer and a fair idea of the heading will work, but it becomes
complex and in the end you need more and more antennas to handle more
jammers.
Ah...you really don't need any a prori knowledge of the location of a
jammer.
A little reading on adaptive antenna technology as applied to GPS will
throw light on my comment and is also some interesting reading. This
would be a starting point:
http://www.raytheon.com/businesses/stellent/groups/sas/documents/content/cms04_022900.pdf
You can use different strategies yes. I was unclear on that.
Either you know the direction and then you can optimize for that or you
just use the power of multiple antennas to create individual lobes for
each receiver channels. You can balance lobe-gain to sat to that of the
offender for best suppression. Setting lobes for each sat does not need
the direction info on the jammer.
That link does not provide as much information as a number of online
articles on directional antennas giving much more detail.
Cheers,
Magnus
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