[ntp:questions] Something else to play with.

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Sat Jun 4 18:51:08 UTC 2011

Eugen COCA wrote:
> On the first page of the manual one may read: "The M9107 GPSDO
> includes an extremely high-performance GPS receiver that can acquire
> and track up to 50 GPS signals ..."
> I'm just curios where you get signals from 50 satellites if the whole
> constellation is about 30 ... with no more than a half visible from a
> single point at a time.

They key is that a GPS which can track multiple reflections of each sat 
signal might, at least in theory, be able to use a reflected signal for 
a short while when the primary (direct beam) is temporarily blocked.

Doing this would allow said gps to estimate the extra delay of the 
secondary paths, and still use them to improve the fix, or to just get a 
fix when in a complicated environment with too few directly visible sats.


- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"

More information about the questions mailing list