[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.
_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
More information about the Time-nuts_lists.febo.com
mailing list