Date: Mon, 28 Feb 94 04:30:49 PST
From: Ham-Space Mailing List and Newsgroup <ham-space@ucsd.edu>
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Subject: Ham-Space Digest V94 #42
To: Ham-Space
Ham-Space Digest Mon, 28 Feb 94 Volume 94 : Issue 42
Today's Topics:
Need COSPAS/SARSAT System information.
TO: Mr. Bill Freeman
Two-Line Orbital Element Set Format
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----------------------------------------------------------------------
Date: 27 Feb 94 06:44:44 GMT
From: news-mail-gateway@ucsd.edu
Subject: Need COSPAS/SARSAT System information.
To: ham-space@ucsd.edu
Hi!
I'm developing an Emergency Beacon for Positioning and Rescue of ship and
aircraft use, and I need some information about the COSPAS/SARSAT satellite
system.
Basically, I want to know what information must be sent, how it has to be
encoded on each of the three frequencies (121.5 MHz, 243 MHz and 406 MHz).
If you have ANY of this information (or part of it), please send it to me (or
at least let me know) via the following paths:
Packet radio: lu7akc @ lu7akc.#col.cf.arg.soam
Internet: postmaster@asarin.org.ar
Thankyou in advance!
73's de Ed Sweet.
------------------------------
Date: 27 Feb 1994 04:54:47 GMT
From: solaris.cc.vt.edu!dogwood!bergst@uunet.uu.net
Subject: TO: Mr. Bill Freeman
To: ham-space@ucsd.edu
Mail to you system bounced. (could be our network)
Thank you for the information. It was very helpful.
Rob Bergstrom
Virginia Tech
------------------------------
Date: Sat, 26 Feb 1994 15:45:17 MST
From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!math.ohio-state.edu!cyber2.cyberstore.ca!nntp.cs.ubc.ca!alberta!ve6mgs!usenet@network.ucsd.edu
Subject: Two-Line Orbital Element Set Format
To: ham-space@ucsd.edu
As a service to the satellite user community, the following description of the
NORAD two-line orbital element set format is uploaded to sci.space.news and
rec.radio.info on a monthly basis. The most current orbital elements
from the NORAD two-line element sets are carried on the Celestial BBS, (513)
*253-9767*, and are updated daily (when possible). Documentation and tracking
software are also available on this system. The Celestial BBS may be accessed
24 hours/day at 300, 1200, 2400, 4800, or 9600 bps using 8 data bits, 1 stop
bit, no parity. In addition, element sets (also updated daily) and some
documentation and software are also available via anonymous ftp from
archive.afit.af.mil (129.92.1.66) in the directory pub/space.
==============================================================================
Data for each satellite consists of three lines in the following format:
AAAAAAAAAAA
1 NNNNNU NNNNNAAA NNNNN.NNNNNNNN +.NNNNNNNN +NNNNN-N +NNNNN-N N NNNNN
2 NNNNN NNN.NNNN NNN.NNNN NNNNNNN NNN.NNNN NNN.NNNN NN.NNNNNNNNNNNNNN
Line 0 is a eleven-character name.
Lines 1 and 2 are the standard Two-Line Orbital Element Set Format identical
to that used by NORAD and NASA. The format description is:
Line 1
Column Description
01-01 Line Number of Element Data
03-07 Satellite Number
10-11 International Designator (Last two digits of launch year)
12-14 International Designator (Launch number of the year)
15-17 International Designator (Piece of launch)
19-20 Epoch Year (Last two digits of year)
21-32 Epoch (Julian Day and fractional portion of the day)
34-43 First Time Derivative of the Mean Motion
or Ballistic Coefficient (Depending on ephemeris type)
45-52 Second Time Derivative of Mean Motion (decimal point assumed;
blank if N/A)
54-61 BST
Otherwise, radiation pressure coefficient. (Decimal point assumed)
63-63 Ephemeris type
65-68 Element number
69-69 Check Sum (Modulo 10)
(Letters, blanks, periods, plus signs = 0; minus signs = 1)
Line 2
Column Description
01-01 Line Number of Element Data
03-07 Satellite Number
09-16 Inclination [Degrees]
18-25 Right Ascension of the Ascending Node [Degrees]
27-33 Eccentricity (decimal point assumed)
35-42 Argument of Perigee [Degrees]
44-51 Mean Anomaly [Degrees]
53-63 Mean Motion [Revs per day]
64-68 Revolution number at epoch [Revs]
69-69 Check Sum (Modulo 10)
All other columns are blank or fixed.
Example:
NOAA 6
1 11416U 86 50.28438588 0.00000140 67960-4 0 5293
2 11416 98.5105 69.3305 0012788 63.2828 296.9658 14.24899292346978
--
Dr TS Kelso Assistant Professor of Space Operations
tkelso@afit.af.mil Air Force Institute of Technology
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End of Ham-Space Digest V94 #42
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