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    tlepublic

    Two-line element set (TLE)

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    Two-line element set (TLE) data format parser

    A two-line element set (TLE) is a data format used to convey sets of orbital elements that describe the orbits of Earth-orbiting satellites. A computer program called a model can use the TLE to compute the position of a satellite at a particular time. The TLE is a format specified by NORAD and used by NORAD and NASA. The TLE can be used directly by the SGP4 model (or one of the SGP8, SDP4, SDP8 models). Orbital elements are determined for many thousands of space objects by NORAD and are freely distributed on the Internet in the form of TLEs. A TLE consists of a title line followed by two lines of formatted text.

    — From Wikipedia

    Install via npm

    $ npm install --save tle

    Format

    More, detailed information is available at NASA Human Space Flight:

    Definition of Two-line Element Set Coordinate System

    Some data to play around with can be found at Celestrak and in Celestrak's Master Index.

    Usage

    var TLE = require( 'tle' )

    Parsing a single set

    var set = 'ISS (ZARYA)\n' +
      '1 25544U 98067A   08264.51782528 -.00002182  00000-0 -11606-4 0  2927\n' +
      '2 25544  51.6416 247.4627 0006703 130.5360 325.0288 15.72125391563537'
    var tle = TLE.parse( set )
    TLE {
      name: 'ISS (ZARYA)',
      number: 25544,
      class: 'U',
      id: '98067A',
      date: Date<'2008-09-20T12:25:40.104Z'>,
      fdmm: -0.00002182,
      sdmm: 0,
      drag: -1.1606,
      ephemeris: 0,
      esn: 292,
      inclination: 51.6416,
      ascension: 247.4627,
      eccentricity: 0.0006703,
      perigee: 130.536,
      anomaly: 325.0288,
      motion: 15.721253915,
      revolution: 6353
    }

    Parsing a stream

    var parser = new TLE.Parser( options ) // OR 
    var parser = TLE.createParser( options )
    fs.createReadStream( FILEPATH )
      .pipe( new TLE.Parser() )
      .on( 'data', function( tle ) {
        // ... 
      })

    Creating a TLE instance from existing data

    // From a JSON string 
    var tle = TLE.fromJSON( '{"name":"ISS (ZARYA)","number":25544,"class":"U","id":"98067A","date":"2008-09-20T12:25:40.104Z","fdmm":-0.00002182,"sdmm":0,"drag":-1.1606,"ephemeris":0,"esn":292,"inclination":51.6416,"ascension":247.4627,"eccentricity":0.0006703,"perigee":130.536,"anomaly":325.0288,"motion":15.721253915,"revolution":6353}' )
    // From an object 
    var tle = TLE.fromJSON({
      name: 'FENGYUN 1C DEB',
      class: 'U',
      id: '29740',
    })

    Speed

    It can read, stream & parse ~2500 TLEs from the file system in about 100ms.

    node example/fs-stream.js
    Parser: 2517 TLEs, 108ms, 23306 op/s
    Parser: 23 op/ms

    Examples

    See examples folder for runnable examples:

    node examples/fs-stream.js
    node examples/http-stream.js

    install

    npm i tle

    Downloadslast 7 days

    2

    version

    1.2.2

    license

    MIT

    repository

    github.com

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