TLE class

TLE data format

Reference: T.S. Kelso

Two line element data consists of three lines in the following format:

AAAAAAAAAAAAAAAAAAAAAA 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 twenty-two-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     BSTAR drag term if GP4 general perturbation theory was used.
          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

Constructors

TLE(String strName, String strLine1, String strLine2)

Properties

field ↔ List<String>
getter/setter pair
hashCode → int
The hash code for this object.
no setterinherited
mapCache ↔ Map<int, double>
getter/setter pair
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
strLine1 ↔ String
getter/setter pair
strLine2 ↔ String
getter/setter pair
strName ↔ String
getter/setter pair

Methods

cIsValidLine(String str, eTleLine line) → bool
IsTleFormat() Returns true if "str" is a valid data line of a two-line element set, else false.
convertUnits(double valNative, eField fld, eUnits units) → double
Convert the given field into the requested units. It is assumed that the value being converted is in the TLE format's "native" form.
expToAtof(String str) → String
expToAtof() Converts TLE-style exponential notation of the form |-00000+|-0 to a form that is parse-able by the C-runtime function atof(). Assumes implied decimal point to the left of the first number in the string, i.e., " 12345-3" = 0.12345e-3 "-23429-5" = -0.23429e-5 " 40436+1" = 0.40436e+1
getField(eField fld, {eUnits units = eUnits.U_NATIVE, String? pstr, bool bStrUnits = false}) → dynamic
getField() Return requested field as a double (function return value) or as a text string (*pstr) in the units requested (eUnit). Set 'bStrUnits' to true to have units appended to text string.
getLine1() → String
getLine2() → String
getName() → String
getUnits(eField fld) → String?
initialize() → void
Initialize() Initialize the string array.
Key(eUnits u, eField f) → int
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited