[time-nuts] Number of GPS sats in the sky?

Bob Camp kb8tq at n1k.org
Fri Jul 10 01:36:21 UTC 2015


HI

http://www.gps.gov/systems/gps/space/

27 Sats in the sky.

Since their altitude is about 2 earth radii, they aren’t height enough to cover a full “half earth” at one time.

Bob

> On Jul 9, 2015, at 7:06 PM, Bob Stewart <bob at evoria.net> wrote:
> 
> Thanks Chris and everyone else who responded.  I just didn't know what to look for.  The full 36 shouldn't take up all that much memory.
> Bob
>      From: Chris Hoffman <cq.kg6o at gmail.com>
> To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com> 
> Sent: Thursday, July 9, 2015 5:48 PM
> Subject: Re: [time-nuts] Number of GPS sats in the sky?
> 
> http://www.navcen.uscg.gov/?Do=constellationStatushttp://www.gps.gov/systems/gps/space/
> 
> IIRC: 6 planes, 6 slots each, so 36 to cover the sphere, and the GPS aperture is big (high orbits) so guess up to 1/2 of the constellation could ever be in view (... yeah, right): 18?
> 
> 
> On Thu, Jul 9, 2015 at 10:54 AM, Bob Stewart <bob at evoria.net> wrote:
> 
> Is there a practical limit to the number of GPS sats overhead at any one time? I ask this because I'd like to start parsing this info from my ublox receiver and need to setup an array for the values.  Memory is not unlimited on my PIC.
> 
> Bob - AE6RV
> 
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