Sorry. Life critical. Fire, ems, law enforcement, aviation, etc.
On Feb 2, 2011, at 3:37 PM, Rex <r...@sonic.net> wrote: > On 2/2/2011 2:29 PM, bownes wrote: >> Of the 2 lc orgs I administer or am a member of, and the roughly 8 other lc >> orgs I interact with on a regular basis, only one uses lc certified gps >> equip. The others are all consumer grade or don't use gps. >> >> However, a slew of filings and letters from the lc community might not be a >> bad idea, if only to lay the groundwork for the inevitable lawsuits. >> >> > > Pardon my ignorance, but I can't immediately work out what you mean by 'lc'. > > >> On Feb 2, 2011, at 3:06 PM, Rex<r...@sonic.net> wrote: >> >>> On 2/2/2011 7:25 AM, jimlux wrote: >>>> >>>> I got the impression that it wasn't modeled, but was an actual field test >>>> of some sort. I'll have to go back and reread. >>>> >>>> But, it's possible that the consumer receiver has better multipath and >>>> interference rejection, if only because it's newer. Aviation stuff takes >>>> longer to go through the approval cycle, so it tends to lag consumer >>>> electronics in terms of technology adoption. >>>> >>>> >>> From the paper submitted by the GPS manufactureres to the FCC >>> http://www.gpsworld.com/gnss-system/signal-processing/lightsquared-jamming-report-11030 >>> >>> it seems they simulated the Lightsquared signal with test equipment and >>> made measurements in an anechoic chamber of effects on GPS signal reception >>> to a couple of popular GPS receivers. Using this data they extrapolated >>> real-world effects with path loss calculations. Ironically, it probably >>> wouldn't be legal or safe to make the jamming measurements in a real, open >>> space, environment. >>> >>> The paper says the Lightspeed transmitters can be up to around 15 kW EIRP >>> in a band right adjacent to GPS. I would think filtering out that signal to >>> avoid overload would be a daunting task. >>> >>> >>> >>> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
