GPS TLE's

geoffh@southlights.gen.nz
Tue, 14 Dec 99 12:07:00 NZST

Hello "good looking", from New Zealand.

For those interested in making your own GPS TLE's, here is the
URL for those who may wish to have a play. I have not seen any
one alse write a similar program - so I think its unique, its
also FREE!

Here is the NASA URL

ftp://tie.jpl.nasa.gov/pub/dransom/sat_track/alm2tle.zip

The following is a sample of the README file.

----------------------------------------------------------------
         Making your own GPS NAVSTAR TLE file.
         -------------------------------------

The group of utilities in this archive, allow a user to produce
a GPS NAVSTAR TLE (Two Line Element) file from a number of
optional sources. The TLE produced when used on satellite
tracking software can give the position of any of the GPS
satellites to an accuracy better than 6 minutes of arc (1/10th
degree).  This is useful for many amateur hobbies to do with
satellite tracking, tracking with amateur optical telescopes,
satellite rise and set (antenna directionality) and just a
learning exercise to do with almanacs, Keplerian elements and
SGP data algorithms.

The motive for making this software was as a winter hobby, to
learn about GPS and because I have a permanent GPS receiver
(used for R&D) attached to my PC network. I also liked the
concept of clicking a mouse to get my own orbital TLE's directly
off the satellites overhead.  Maybe its useful for you too,
especially if you are at a remote site and do not have access to
the Internet and USSPACECOMS TLE's.

Which utilities you use depend on how you are able to produce
the almanac file. There are four options.

1. Your GPS receiver can output the Almanac in YUMA format.

2. Your GPS receiver can output the Almanac in NMEA format.

3. You have a Motorola Oncore receiver (and perhaps older Motorola
receiver) using the Motorola binary format.

4. You have access to the Internet.

              -----------###-----------

The 3 exe programs enclosed are all compiled as 16 bit DOS
applications - should also run fine under the various Windows
platforms.

Regards Geoff...

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