[time-nuts] The Demise of LORAN (was Re: Reference oscillatoraccuracy)

[Bruce Rahn]

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  


Bruce, WB9ANQ

-- 
Bruce Rahn

Wisdom has two parts:
1.  having a lot to say; and
2.  not saying it!