[time-nuts] GPS interference and history...

Jim Lux jimlux at earthlink.net
Thu Jun 9 19:32:42 UTC 2011


On 6/9/11 12:22 PM, Chuck Forsberg WA7KGX N2469R wrote:
> According to the John Deere article, the higher performance GPS
> receivers, such as those used
> for agricultural application and IFR navigation have wider front ends to
> obtain more precise information
> from GPS signals. The LightSquared transmitters wouldn't pose such a
> problem if they were in orbit.
>>

Exactly.. Deere (and others) designed based on the general understanding 
of what the spectrum would look like.  Mostly satellite radiated (where, 
as others have noted, you're limited to a few kW) and a few "fill-in" 
transmitters to handle "urban canyons" and the like.. low power in 
general, and not in the middle of a farm field in any case.

The L^2 scheme turned that on its head.. lots of high powered 
terrestrial transmitters, etc.





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