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/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = twoline2satrec;
var _constants = require("./constants");
var _ext = require("./ext");
var _sgp4init = _interopRequireDefault(require("./propagation/sgp4init"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
/* -----------------------------------------------------------------------------
*
* function twoline2rv
*
* this function converts the two line element set character string data to
* variables and initializes the sgp4 variables. several intermediate varaibles
* and quantities are determined. note that the result is a structure so multiple
* satellites can be processed simultaneously without having to reinitialize. the
* verification mode is an important option that permits quick checks of any
* changes to the underlying technical theory. this option works using a
* modified tle file in which the start, stop, and delta time values are
* included at the end of the second line of data. this only works with the
* verification mode. the catalog mode simply propagates from -1440 to 1440 min
* from epoch and is useful when performing entire catalog runs.
*
* author : david vallado 719-573-2600 1 mar 2001
*
* inputs :
* longstr1 - first line of the tle
* longstr2 - second line of the tle
* typerun - type of run verification 'v', catalog 'c',
* manual 'm'
* typeinput - type of manual input mfe 'm', epoch 'e', dayofyr 'd'
* opsmode - mode of operation afspc or improved 'a', 'i'
* whichconst - which set of constants to use 72, 84
*
* outputs :
* satrec - structure containing all the sgp4 satellite information
*
* coupling :
* getgravconst-
* days2mdhms - conversion of days to month, day, hour, minute, second
* jday - convert day month year hour minute second into julian date
* sgp4init - initialize the sgp4 variables
*
* references :
* norad spacetrack report #3
* vallado, crawford, hujsak, kelso 2006
--------------------------------------------------------------------------- */
/**
* Return a Satellite imported from two lines of TLE data.
*
* Provide the two TLE lines as strings `longstr1` and `longstr2`,
* and select which standard set of gravitational constants you want
* by providing `gravity_constants`:
*
* `sgp4.propagation.wgs72` - Standard WGS 72 model
* `sgp4.propagation.wgs84` - More recent WGS 84 model
* `sgp4.propagation.wgs72old` - Legacy support for old SGP4 behavior
*
* Normally, computations are made using letious recent improvements
* to the algorithm. If you want to turn some of these off and go
* back into "afspc" mode, then set `afspc_mode` to `True`.
*/
function twoline2satrec(longstr1, longstr2) {
var opsmode = 'i';
var xpdotp = 1440.0 / (2.0 * _constants.pi); // 229.1831180523293;
var year = 0;
var satrec = {};
satrec.error = 0;
satrec.satnum = longstr1.substring(2, 7);
satrec.epochyr = parseInt(longstr1.substring(18, 20), 10);
satrec.epochdays = parseFloat(longstr1.substring(20, 32));
satrec.ndot = parseFloat(longstr1.substring(33, 43));
satrec.nddot = parseFloat(".".concat(parseInt(longstr1.substring(44, 50), 10), "E").concat(longstr1.substring(50, 52)));
satrec.bstar = parseFloat("".concat(longstr1.substring(53, 54), ".").concat(parseInt(longstr1.substring(54, 59), 10), "E").concat(longstr1.substring(59, 61)));
// satrec.satnum = longstr2.substring(2, 7);
satrec.inclo = parseFloat(longstr2.substring(8, 16));
satrec.nodeo = parseFloat(longstr2.substring(17, 25));
satrec.ecco = parseFloat(".".concat(longstr2.substring(26, 33)));
satrec.argpo = parseFloat(longstr2.substring(34, 42));
satrec.mo = parseFloat(longstr2.substring(43, 51));
satrec.no = parseFloat(longstr2.substring(52, 63));
// ---- find no, ndot, nddot ----
satrec.no /= xpdotp; // rad/min
// satrec.nddot= satrec.nddot * Math.pow(10.0, nexp);
// satrec.bstar= satrec.bstar * Math.pow(10.0, ibexp);
// ---- convert to sgp4 units ----
// satrec.ndot /= (xpdotp * 1440.0); // ? * minperday
// satrec.nddot /= (xpdotp * 1440.0 * 1440);
// ---- find standard orbital elements ----
satrec.inclo *= _constants.deg2rad;
satrec.nodeo *= _constants.deg2rad;
satrec.argpo *= _constants.deg2rad;
satrec.mo *= _constants.deg2rad;
// ----------------------------------------------------------------
// find sgp4epoch time of element set
// remember that sgp4 uses units of days from 0 jan 1950 (sgp4epoch)
// and minutes from the epoch (time)
// ----------------------------------------------------------------
// ---------------- temp fix for years from 1957-2056 -------------------
// --------- correct fix will occur when year is 4-digit in tle ---------
if (satrec.epochyr < 57) {
year = satrec.epochyr + 2000;
} else {
year = satrec.epochyr + 1900;
}
var mdhmsResult = (0, _ext.days2mdhms)(year, satrec.epochdays);
var mon = mdhmsResult.mon,
day = mdhmsResult.day,
hr = mdhmsResult.hr,
minute = mdhmsResult.minute,
sec = mdhmsResult.sec;
satrec.jdsatepoch = (0, _ext.jday)(year, mon, day, hr, minute, sec);
// ---------------- initialize the orbit at sgp4epoch -------------------
(0, _sgp4init["default"])(satrec, {
opsmode: opsmode,
satn: satrec.satnum,
epoch: satrec.jdsatepoch - 2433281.5,
xbstar: satrec.bstar,
xecco: satrec.ecco,
xargpo: satrec.argpo,
xinclo: satrec.inclo,
xmo: satrec.mo,
xno: satrec.no,
xnodeo: satrec.nodeo
});
return satrec;
}