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

Mark Spencer mspencer12345 at yahoo.ca
Thu Jun 9 19:42:26 UTC 2011

I seem to recall that some of the high precision users also need to receive a 
satellite delivered differential GPS signal outside of the GPS band.

----- Original Message ----
From: Jim Lux <jimlux at earthlink.net>
To: time-nuts at febo.com
Sent: Thu, June 9, 2011 12:32:42 PM
Subject: Re: [time-nuts] GPS interference and history...

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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