Re: GPS Tip: How many WAAS satellites are there?


"SKM-PSN#55" <skmort@xxxxxxxxxx> wrote in message
news:1143058137.961000.203160@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Paul Catchpole wrote:
After the posts on WAAS and me saying that my GPs 15 was picking up sat
50,
I added a line to one of my tracking programmes and it now tells me it
was
tracking 33thru 36, 38,39, 41 thru 43, 45 thru 47, 50 and 51. All in
about
an hour 3-4 UTC 22 Mar.
Can that be so, or am I doing something silly?
And can somebody point me to where I can find the co-relation between
sats
and the numbers. From a recent post there obviously is one, but perhaps I
missed. Some of us have to work.
Paul C

Perhaps your program is indicating which Sats it was searching for?????
Unless your getting signals bouncing off the moon, I would expect you
to only see:
42 @ 140E, 50 @ 146E, 47 @ 178E, 35 when it gets to 142W,
48 @ 133W, and maybe 38 @ 107.5W

The relationship of PRN to Sat. ID is 87
Sat. ID plus 87 = PRN
PRN minus 87 = Sat. ID
The range of SBAS birds is from PRN 120 to 158 Sat. ID 33 to 71
The range for my two Garmins is from 120 to 138 Sat. ID 33 to 51
Here is a link:
http://gps.losangeles.af.mil/prn/sbas_ranging_codes.htm
Stephen
PSN Station #55

Thanks Stephen,
I study that later but you're probably correct. They were sats in view: not
those actually being used.


.