[time-nuts] LORAN-C demise

Magnus Danielson magnus at rubidium.dyndns.org
Mon Nov 30 00:13:24 UTC 2009


Poul-Henning Kamp wrote:
> In message <4B130050.1050002 at rubidium.dyndns.org>, Magnus Danielson writes:
>> bg at lysator.liu.se wrote:
> 
>> L1, L2, L3, L4 and L5 jammers is off the shelf. Not particular 
>> efficient, not to speak of L3 and L4 being of no significant use.
> 
> Not to mention the fact that there is a good probability that
> GPS and Galileo will jam each other, degrading both signals more
> than the benefit of having twice as many birds will be able to
> compensate for...
> 

That particular aspect have been in deep investigation, and so has the 
M-codes. Their similarity in strength and code separation make the 
effect less than the gain you get. The BOC code aids to insert signal in 
the null of the L1 code which causes additional spectral/code division.

Cheers,
Magnus




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