SVN63 USABINIT

Apparently the GPS operations center set PRN01 usable but forgot to
announce it to the world.


2011085------------------------
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2011085
SUBJ: SVN63 (PRN1) USABLE JDAY 287/1953
1. NANU TYPE: USABINIT
NANU NUMBER: 2011085
NANU DTG: 142008Z OCT 2011
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 63
PRN: 1
START JDAY: 287
START TIME ZULU: 1953
START CALENDAR DATE: 14 OCT 2011
STOP JDAY: N/A
STOP TIME ZULU: N/A
STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN63 (PRN1) WAS USABLE AS OF JDAY 287
(14 OCT 2011) BEGINNING 1953 ZULU.


--- CHAS

On 2011-10-15 17:55 , HIPAR wrote:

Receivers don't care about announcements.

Just downloaded http://www.movingsatellites.com/e_gps1.html

A bit "old style" but cool to look at orbits. Uses TLE's.

For PC's, alas, but then I have WinXP running under Fusion on the Mac.

--
gmail originated posts filtered due to spam.

wrote:


I was working on a hobby project software program when I noticed PRN01
is working. So you are correct, receivers don't wait for the
announcement.

For some reason, NANU 2011085 wasn't broadcast through the automatic
notification process. I checked the GPS Operations website and it was
there.

I have been using the Moving Satellites software for many years. It
works OK. I made my own background world map because I don't like the
textures included with the program.

The tracking algorithms were developed back in the 80's and they are
very sophisticated. They account for lunar and solar effects which
are applied selectively according to the orbital characteristics.
Evidently, Dr Kelso developed the algorithms for NORAD.

--- CHAS

On 2011-10-16 13:38 , HIPAR wrote:

I don't care too much for the accuracy as the illustrative effect in
determining coverage issues. IOW, I'll DL fresh TLE's every few weeks
or whenever I use the program after a good interval.

Also just cool to watch in accelerated time simulation.

There is such a plugin for Google Earth, but I can't seem to get them to
pull in the TLE's from any source in a reliable manner.

--
gmail originated posts filtered due to spam.

The TLE's obtained from 'Open from the web' menu are usually current
to within a few days. If you need the latest data, I suppose you will
need tracking software the uses the actual GPS almanac that is updated
daily.

I've noticed the NORAD TLE's tend to lag many days for a satellite
repositioned after a Delta V.

--- CHAS