$SATDATA/satellite/orbinput
$SATDATA/satellite/twoinput
$SATDATA/satellite/orbdata
The file orbinput contains 1-line orbital elements for a specific satellite in ASCII format. The file twoinput contains 2-line orbital elements in ASCII format. The file orbdata contains the same information in the form of a TeraScan dataset (see datasets). The conversion is performed by the functions fixoes (1-line elements), add2line (2-line elements), neworb, or newoes.
orbinput, twoinput, and orbdata files for each satellite are located in the directories $SATDATA/satellite, where satellite is noaa-12, f-10, etc.
The format for the orbinput file is as follows:
noaa-10 16969 16969.4098750.8346107.00674.0013184.7651416.8121728.2743026860918 16969.0880240.8346073.99997.0013279.7370381.8122355.2743012860921 16969.5383281.8346078.00000.0013479.7200916.8122764.2742979860923 16969.2114379.8346076.00001.0013387.6970079.8123250.2742960860926 . . .
where the first line contains the satellite name and satellite ID. Each subsequent line is a one-line orbital element record with the following field descriptions (format in FORTRAN notation):
Field Format Description
--------------------------------------------------------------
1 I5 Satellite ID (NORAD catalog number)
2 F8.7 Mean Anomaly
3 F8.7 Mean Motion
4 F6.5 Drag (Mean Deceleration)
5 F8.7 Eccentricity
6 F8.7 Argument of Perigee
7 F8.7 Longitude of Ascending Node
8 F8.7 Inclination
9 I6 Epoch Date (yymmdd)
The format for the twoinput file is as follows:
noaa-14 23455 1 23455U 94089 A 01 39.98477823 .00000424 00000-0 00000+0 0 6176 2 23455 99.1712 29.4038 0009578 145.7018 214.5256 14.12577831315127 1 23455U 94089 A 01157.20609471 .00000330 00000-0 00000+0 0 7647 2 23455 99.1795 149.4459 0009360 175.6488 184.5258 14.12694537331679 . . .
where the first line contains the satellite name and satellite ID. Each subsequent set of lines is a two-line orbital element record with the following field descriptions
Line 1:
Number
Field of chars Description
--------------------------------------------------------------
1 1 Line Number
2 5 Satellite ID (NORAD catalog number)
3 1 Security Classification (U=Unclassified)
4 8 International ID
5 14 Epoch Date (yyddd.fod) (ddd is "julian day"
and fod is "fraction of 24-hour day")
6 1 Sign of First Time Derivative
7 9 First Time Derivative
8 1 Sign of Second Time Derivative
9 5 Second Time Derivative
10 1 Sign of Second Time Derivative Exponent
11 1 Exponent of Second Time Derivative
12 1 Sign of Bstar/Drag Term
13 1 Sign of Exponent of Bstar/Drag Term
14 1 Ephemeris Type
15 4 Element Number
16 1 Check Sum, Modulo 10
Line 2:
Number Field of chars Description -------------------------------------------------------------- 1 1 Line Number 2 5 Satellite ID 3 8 Inclination 4 8 Right Ascension of Ascending Node 5 7 Eccentricity with Assumed Leading Decimal 6 8 Argument of the Perigee 7 8 Mean Anomoly 8 11 Revolutions per Day (Mean Motion) 9 5 Revolution Number at Epoch 10 1 Check Sum, Modulo 10
The contents of the corresponding orbdata file is:
temp_51_% contents orbdata printout : char( 3) ? [no] Contents of File: orbdata Page 1 Dimension Size Coord Scale Offset orb_elem_date 785 ? 1 0 orb_elements 7 ? 1 0 Variable Type Units orb_elem_date long std_date orb_elements double Variable Dimension Size orb_elem_date orb_elem_date 785 orb_elements orb_elem_date 785 orb_elements orb_elements 7
This particular orbital element file contains 785 orbital element records. Each record contains fields 2-8 shown above for orbinput.
$SATDATA/satellite/orbinput, $SATDATA/satellite/orbdata, $SATDATA/satellite/twoinput
datasets, etx, neworb, fixoes, add2line, newsensor.
Click here for information on how to update orbital elements.
Last Update: $Date: 2001/10/13 00:50:47 $