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- PC-TRACK File Conversion Utility
- Copyright (c) 1991 Thomas C. Johnson
- =====================================
-
- This conversion utility has been written at the request of many users who
- wanted an easier way to update their satellite data file. It takes advantage
- of the data made available by the Celestial BBS in Fairborn, Ohio and other
- BBSs that carry NASA Two Line Orbital Elements. The Celestial BBS is
- dedicated to satellite tracking needs and contains several files which have
- updated keplerian element sets for a large number of satellites.
-
- One of the main data files is called TLE.TXT. It contains data for over
- 100 satellites. It is also available in an archived form called TLE.ARC.
-
- (See below for information about the Celestial BBS)
-
- CONVERT will take the ASCII text in the file (format shown below), and
- convert the data therein to the format required by PC-TRACK.
-
-
- SYNTAX:
- CONVERT [d:\path\srcfile] [d:\path\destobjfile]
- or
- CONVERT /H
- Where:
- srcfile is the source data filename.
- destobjfile is the destination object filename.
-
- Invoking CONVERT with no parameters will cause it to utilize the following
- defaults:
- srcfile = TLE.TXT
- destobjfile = OBJECTS.DAT
-
- Example:
- To convert the TLE.TXT provided in the \PCTRACK directory to the
- OBJECTS.DAT file in the \PCTRACK\DATA directory, you would use the
- following syntax:
-
- CONVERT * .\DATA\OBJECTS.DAT
- (Assuming you were currently in the \PCTRACK directory)
-
- =============================================================================
-
- NOTE:
- THE FOLLOWING INFORMATION WAS DOWNLOADED FROM THE CELESTIAL BBS
- FOR YOUR CONVENIENCE.
-
-
- ==================
- Format Description
- ==================
-
- Data for each satellite will consist 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 NASA and NORAD. 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 of ephemeris type)
- 45-52 Second Time Derivative of Mean Motion (Blank if N/A)
- 54-61 BSTAR drag term if GP4 general perturbation theory was used.
- Otherwise, radiation pressure coefficient.
- 63-63 Ephemeris type
- 65-68 Element number
- 69-69 Check Sum (Modulo 10)
- (Letters, blanks, periods = 0; minus sign = 1; plus sign = 2)
-
- 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
-
- Note that the International Designator fields are frequently blank. All
- epochs are UTC (Coordinated Universal Time).
-
-
-
- =====================
- Satellite Frequencies
- =====================
-
- Oftentimes, users request lists of the frequencies used by the satellites
- contained in two-line element sets. While there are some lists online for
- amateur radio and weather satellites and the space shuttle (use the WHATSFOR
- option in the File Section and use "frequency" as a keyword to search on), it
- would be impossible for me to keep up with a list of frequencies for any large
- number of satellites. All satellites operate on a number of different
- frequencies and many of them change frequencies on a regular basis. Which
- frequencies you are interested in depends upon what you are trying to do. If
- you cannot find the information you need here, ask a specific question (e.g.,
- What frequency does NOAA 11 transmit APT data on?) in a message addressed to
- ALL; that should get you started. I welcome the assistance of anyone willing
- to provide frequency information on satellites with which they are familiar; I
- will take whatever inputs I receive and compile them into a master listing.
-
- ==================
- System Description
- ==================
-
- The Celestial BBS is a public domain Bulletin Board System (BBS) designed to
- facilitate communications between individuals with interests in the space
- sciences (Astronomy, Astrodynamics, Astrophysics, Celestial Mechanics, and
- Satellite Technology) and related computer applications. The BBS may be used
- to pass information and ask questions on these and related subjects. The BBS
- is intended to provide a Public Domain Software Exchange (PDSE) primarily for
- applications relating to the space sciences, as well as general utilities.
- All contributions are welcome!
-
- The Celestial BBS receives calls at
-
- (513) 427-0674.
-
- The SYSOP is T.S. Kelso.
-
- ===============
- Mailing Address
- ===============
-
- The mailing address is:
-
- Celestial BBS
- 2340 Raider Drive
- Fairborn, OH 45324-2001
-