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1993-08-18
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Program STSORBIT PLUS Satellite Orbit Simulation Page 1
Program STSORBIT PLUS
Space Shuttle and Satellite Orbit Simulation
(Enhanced Version for 286/386/486 Computers)
Version 9334
August 18, 1993
by David H. Ransom, Jr.
Rancho Palos Verdes, CA USA
Bulletin Board Systems
----------------------
RPV ASTRONOMY BBS
(310) 541-7299 @ 14400/9600/2400 Baud
RPV HOTLINE BBS
(310) 544-8977 @ 2400/1200 Baud
IMPORTANT NOTE REGARDING VERSION 9334
-------------------------------------
STSORBIT PLUS Version 9333 (and later) is a major upgrade to the
program and adds multi-satellite tracking capability. See the documentation
and file STSPLUS.NEW for a full description of the changes. As part of this
upgrade, the format of file STSPLUS.INI has been completely reworked and
any prior version of the file will be ignored. ALL PROGRAM OPTIONS MUST BE
RESET! The distribution package includes a sample STSPLUS.INI file
configured to suit my own preferences and which defaults all paths to the
directory from which the program is started. If you are upgrading, use F7
from the Main Menu to set all paths and filenames if your system is
organized differently.
BRIEF PROGRAM INSTRUCTIONS
--------------------------
This file is intended to help the experienced user get started with
program STSORBIT PLUS (referred to as STSPLUS hereafter). It is NOT
intended to be a substitute for the full program documentation!
STSPLUS is a program to track the NASA Space Shuttle and other
satellites. The program requires NASA/NORAD 2-line elements for orbital
data and may be used with any satellite for which 2-line data is available.
Program STSORBIT PLUS Satellite Orbit Simulation Page 2
The following steps should get the program "up and running" with as
little fuss and bother as practical.
1. A hard disk is required. It is recommended that all files be placed in
a subdirectory called STSPLUS. If you do not have a directory for the
program, make one with the following commands:
C:
CD \
MD STSPLUS
These commands assume drive C:. If you are using another drive or a
different directory name, make the appropriate changes.
2. If you have modified or customized support files such as STSPLUS.CTY,
STSPLUS.LOC, and STSPLUS.LTD, make backup copies of these files NOW!
The installation process may overwrite these files!
3. Log into the STSPLUS subdirectory using the following commands (which
assume drive C:):
C:
CD \STSPLUS
If the program has been received as a set of self-extracting archive
files with names like SOP9334A.EXE, SOP9334B.EXE and EARTH3.EXE,
execute each of these programs in turn; this will extract the actual
program and data files. If you are replacing an existing installation,
you will be asked to approve each file that may be overwritten. (The
self-extracting archive files may be deleted if they have been saved
on a floppy disk.)
4. If you have used a previous version of STSPLUS, note that STSPLUS may
not read data from file STSPLUS.INI if it was written by a program
version prior to 9332. The format of the file has changed and this
will reset all features to their default conditions. If difficulties
are encountered, DELETE FILE STSPLUS.INI AND RESET ALL OPTIONS
MANUALLY!
5. Enter the following command to start the program:
STSPLUS (for all CGA/EGA/VGA color systems)
STSPLUS /M (for all EGA/VGA monochrome systems)
6. The STSPLUS.EXE file is stored on disk in compressed form. It is
decompressed at load time; this may cause a brief delay depending upon
the computer type used. Once the program is properly loaded, a screen
will appear which requests that you set the UTC Offset for your time
zone. Follow the on-screen instructions and enter the UTC Offset and
the Daylight Flag.
7. Once the Main Menu is displayed, press F7 and set all paths and
filenames. STSPLUS will default to the directory from which it was
executed.
Program STSORBIT PLUS Satellite Orbit Simulation Page 3
8. The distribution package includes a set of US Space Command 2-line
elements with a name like TLE232.TXT. This contains orbital data on
over 170 different satellites. Press F2 to load orbital information.
The screen will display a list of files having the extension .TXT. The
TLEnnn.TXT file should be one of them. Enter the file name at the
prompt and press ENTER.
9. The program will ask what satellite you wish to view with a default
response of "HST" (meaning the Hubble Space Telescope). Press ENTER to
accept the default or enter another satellite name (such as "MIR" or
"UARS"). If the name of the data file begins with the letters "STS",
the default satellite name will be "STS". You may also enter the
satellite's NORAD Number, such as "#16609" for MIR.
10. The program will search the data file for the requested satellite and
display its orbital data if found. If this is the satellite you wish,
press ENTER when asked. Press SPACE to continue searching.
11. After the satellite has been selected, STSPLUS will display a map of
the world and the ground track of the satellite. The satellite itself
will be a white symbol along the ground track. EGA and VGA systems
will display in color; CGA and HGC systems will display in monochrome.
12. Press ENTER any time the map is displayed to return to the Main Menu.
13. STSPLUS has many features which are fully described in the program
documentation. Please read that documentation!
14. The latest version of STSPLUS and current US Space Command 2-line
elements are always available on my bulletin board systems (BBS) noted
at the beginning of this document. Eash BBS uses a power controller;
if it hasn't answered after the THIRD RING, hang up and call back in
two minutes. The systems are often busy, so please be patient.
USING MISSION ELAPSED TIME WITH 2-LINE ELEMENTS
-----------------------------------------------
The standard NASA/NORAD 2-line orbital element format does NOT include
the launch time or launch date. However, this information is obviously
required if Mission Elapsed Time (MET) is to be displayed. That information
must therefore be obtained independently and manually entered into the
program. The following steps are required:
1. Start program STSPLUS (see above).
2. Load the 2-line elements for the desired satellite using Function Key
F2 on the Main Menu. Press ENTER to return from the ground track
display to the Main Menu.
3. Press Function Key F5 to enter Launch Time and Launch Date. Enter the
appropriate information. Note that if you enter UTC or GMT Launch Time
(by adding the letter "U" or "G" at the end of the time, upper or
lower case), STSPLUS assumes that the date you enter will also be the
Program STSORBIT PLUS Satellite Orbit Simulation Page 4
UTC/GMT Launch Date.
4. The information will be displayed for approval. Press ENTER to accept
the data, or press SPACE BAR to repeat the process.
5. Once the data have been accepted, press Function Key F5 while the map
is on screen to display Mission Elapsed Time. Press F5 again to return
to Time Elapsed Since Epoch. (Press Function Key F1 for help when the
map is displayed with rectangular projection.) If a launch time and
date have not been entered, the F5 command will have no effect and
Time Since Epoch will always be displayed.
6. The launch time and launch date will be saved in file STSPLUS.LTD and
need only be entered once unless it must be changed for some reason.
NOTE: Estimated Pre-Launch 2-Line Elements for the Space Shuttle
always use a "dummy" NORAD Number (such as "00051" for STS-51). Once
US Space Command has assigned the actual NORAD Number, the launch time
and date must be re-entered using the correct NORAD number.
The simulated time, taking into account any fast time that may have
been in effect up to that point, is shown on the screen.
For reference, the local and UTC time (as determined by the computer's
internal DOS clock) are displayed. The MET (Mission Elapsed Time) or
T+Epoch shows the current elapsed time in the mission or the time since the
epoch of the orbital elements.
The combination of the Pass Prediction feature (F3 from the Main Menu)
and the FAST and PAUSE modes will let you "look ahead" and then freeze the
display at a time of interest -- such as when the satellite enters your
circle of visibility. You can then use the "+" and "-" keys to move the
satellite position back and forward in time (using Function Key F6 to
select the time step interval, 1, 10 or 60 seconds) to determine the times
and positions throughout a pass.
USERS WITHOUT A MATH COPROCESSOR CHIP
-------------------------------------
Operation of STSPLUS on systems not equipped with a math coprocessor
chip may not provide acceptable performance. STSPLUS makes very complex
calculations to determine the position of the Earth, one or more
Satellites, and the Sun. In addition, graphics operations required to
display the maps and satellite tracks and positions also require many
calculations. Slow computers or computers not equipped with a math
coprocessor chip (8087, 80287, 80387, etc.) may not be able to perform all
of the required calculations in an acceptable time
Note that the Sun terminator feature is NOT automatically disabled;
however, slower computers without a math coprocessor chip may be unable to
keep up with real time if this feature is enabled. From the Main Menu, use
F10+F3+F8 to disable this feature if necessary.
PROGRAM REGISTRATION
--------------------
Program STSORBIT PLUS Satellite Orbit Simulation Page 5
See the file README for information on registering STSPLUS. While I
do not require registration of STSPLUS, I've put a great deal of time and
effort into the program for more than two years. Registering your copy and
including the very modest donation of $10.00 is a real software bargain,
and will encourage me to continue maintaining and improving the program.
David H. Ransom, Jr.
7130 Avenida Altisima
Rancho Palos Verdes, CA 90274 USA