ESP32 LoRa for dummys - TinyGS: TLE Data

La NASA (National Aeronautics and Space Administration) y la NORAD North American Aerospace Defense Command han definido un protocolo de mensajería de satélites TLE (Two Line Element) que es un protocolo de facto 

Line 1
Column	Description
01	Line Number of Element Data
03-07	Satellite Number
08	Classification (U=Unclassified)
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 the launch)
19-20	Epoch Year (Last two digits of year)
21-32	Epoch (Day of the year and fractional portion of the day)
34-43	First Time Derivative of the Mean Motion
45-52	Second Time Derivative of Mean Motion (Leading decimal point assumed)
54-61	BSTAR drag term (Leading decimal point assumed)
63	Ephemeris type
65-68	Element number
69	Checksum (Modulo 10) (Letters, blanks, periods, plus signs = 0; minus signs = 1)

Line 2
Column	Description
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 (Leading 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	Checksum (Modulo 10)

Ejemplo

NOAA 14                 

1 23455U 94089A   97320.90946019  .00000140  00000-0  10191-3 0  2621

2 23455  99.0090 272.6745 0008546 223.1686 136.8816 14.11711747148495

Referencia:

• NORAD Two-Line Element Set Format
• Frequently Asked Questions: Two-Line Element Set Format By Dr. T.S. Kelso
• ADCOM/DO Form 12 (Element Set Formats).

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