Re: Euro GPS system


Holger Issle <Holger@xxxxxxxx> writes:
Hi Wolfgang,

Do you know if any of them are run in 20-channel mode? Both my Garmin
60csx and Globalsat bu-353 "usb mouse" gps are run in 12-channel mode.

How do you know that?

Both units will send a satellite status report packet with only
12-channels of information in it. On both units the packet format is
variable size, with a size field describing the amount of data to
follow. It would be easy for them to send 20-channels of zero-padded
information instead of 12-channels. In both cases they only ever send
12-channels.

With 3 WAAS satellites in sight here, I'd expect to see 15 satellites
above the horizon during some times of the day. If the unit was
configured to have 20 channels I'd expect the satellite status to show
at least 15 active slots, where it was showing the carrier/noise ratio
of all the prospective satellites.

-wolfgang
--
Wolfgang S. Rupprecht http://www.wsrcc.com/wolfgang/
.

Relevant Pages

  • Re: Things we remember...
    ... the horizon obviously, and in effect what you get from each is its ... satellites are spaced round your terrestrial horizon then your ... time on the horizon than appearing high overhead, ... approximate relative probabilities without needing to have the exact ...
    (rec.arts.sf.written)
  • Re: August 13 - Light shows and other cruising delights
    ... Like our weather satellites, ... minutes from horizon to horizon. ... One of the coolest things was when the ISS was passing overhead, ... took my laptop w/wifi outside and was watching on NASA's website ...
    (rec.boats.cruising)
  • Re: Wed 7/15 fantastic day, but SPOT??
    ... the radio link between Spot and the Global ... Statistically 2 or 3 satellites are likely to be ... the horizon. ... in banked turns. ...
    (rec.aviation.soaring)
  • Re: GPS versus source dependency / ballistic theory
    ... >> depending on the sats involved overhead or at the horizon. ... > to the GPS, AND THE WAY THE GPS ASSUMES c ALONE, would induce position ... > The v of the satellites is indeed small compared to c, ... So even though the satellite range error approaches zero as psi ...
    (sci.physics.relativity)
  • Re: GPS versus source dependency / ballistic theory
    ... >> depending on the sats involved overhead or at the horizon. ... > to the GPS, AND THE WAY THE GPS ASSUMES c ALONE, would induce position ... > The v of the satellites is indeed small compared to c, ... So even though the satellite range error approaches zero as psi ...
    (sci.physics)