def init_date(self): if self.epoch_yr < 57: year = self.epoch_yr + 2000 else: year = self.epoch_yr + 1900 mon, day, hr, minute, sec = days2mdhms(year, self.epoch_day) sec_whole, sec_frac = divmod(sec, 1.0) self.date = datetime(year, mon, day, hr, minute, int(sec_whole), int(sec_frac * 1000000.0 // 1.0), timezone.utc) self.timestamp = int(time.mktime(self.date.timetuple())) self.jdate = jday(year, mon, day, hr, minute, sec)
def twoline2rv(cls, line1, line2, whichconst=WGS72): whichconst = gravity_constants[whichconst] self = cls() twoline2rv(line1, line2, whichconst, 'i', self) # Install a fancy split JD of the kind the C++ natively supports. # We rebuild it from the TLE year and day to maintain precision. year = self.epochyr month, day, h, m, s = days2mdhms(year, self.epochdays) self.jdsatepoch, self.jdsatepochF = jday2(year, month, day, h, m, s) # Undo my non-standard 4-digit year self.epochyr %= 100 return self
def twoline2rv(longstr1, longstr2, whichconst, opsmode='i', satrec=None): """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.earth_gravity.wgs72` - Standard WGS 72 model `sgp4.earth_gravity.wgs84` - More recent WGS 84 model `sgp4.earth_gravity.wgs72old` - Legacy support for old SGP4 behavior Normally, computations are made using various recent improvements to the algorithm. If you want to turn some of these off and go back into "opsmode" mode, then set `opsmode` to `a`. """ deg2rad = pi / 180.0 # 0.0174532925199433 xpdotp = 1440.0 / (2.0 * pi) # 229.1831180523293 # For compatibility with our 1.x API, build an old Satellite object # if the caller fails to supply a satrec. In that case we perform # the necessary import here to avoid an import loop. if satrec is None: from sgp4.model import Satellite satrec = Satellite() satrec.error = 0 satrec.whichconst = whichconst # Python extension: remembers its consts line = longstr1.rstrip() if (len(line) >= 64 and line.startswith('1 ') and line[8] == ' ' and line[23] == '.' and line[32] == ' ' and line[34] == '.' and line[43] == ' ' and line[52] == ' ' and line[61] == ' ' and line[63] == ' '): _saved_satnum = satrec.satnum = _alpha5(line[2:7]) satrec.classification = line[7] or 'U' satrec.intldesg = line[9:17].rstrip() two_digit_year = int(line[18:20]) satrec.epochdays = float(line[20:32]) satrec.ndot = float(line[33:43]) satrec.nddot = float(line[44] + '.' + line[45:50]) nexp = int(line[50:52]) satrec.bstar = float(line[53] + '.' + line[54:59]) ibexp = int(line[59:61]) satrec.ephtype = line[62] satrec.elnum = int(line[64:68]) else: raise ValueError(error_message.format(1, LINE1, line)) line = longstr2.rstrip() if (len(line) >= 69 and line.startswith('2 ') and line[7] == ' ' and line[11] == '.' and line[16] == ' ' and line[20] == '.' and line[25] == ' ' and line[33] == ' ' and line[37] == '.' and line[42] == ' ' and line[46] == '.' and line[51] == ' '): satrec.satnum = _alpha5(line[2:7]) if _saved_satnum != satrec.satnum: raise ValueError('Object numbers in lines 1 and 2 do not match') satrec.inclo = float(line[8:16]) satrec.nodeo = float(line[17:25]) satrec.ecco = float('0.' + line[26:33].replace(' ', '0')) satrec.argpo = float(line[34:42]) satrec.mo = float(line[43:51]) satrec.no_kozai = float(line[52:63]) satrec.revnum = line[63:68] #except (AssertionError, IndexError, ValueError): else: raise ValueError(error_message.format(2, LINE2, line)) # ---- find no, ndot, nddot ---- satrec.no_kozai = satrec.no_kozai / xpdotp # rad/min satrec.nddot = satrec.nddot * pow(10.0, nexp) satrec.bstar = satrec.bstar * pow(10.0, ibexp) # ---- convert to sgp4 units ---- satrec.ndot = satrec.ndot / (xpdotp * 1440.0) # ? * minperday satrec.nddot = satrec.nddot / (xpdotp * 1440.0 * 1440) # ---- find standard orbital elements ---- satrec.inclo = satrec.inclo * deg2rad satrec.nodeo = satrec.nodeo * deg2rad satrec.argpo = satrec.argpo * deg2rad satrec.mo = satrec.mo * 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 two_digit_year < 57: year = two_digit_year + 2000 else: year = two_digit_year + 1900 mon, day, hr, minute, sec = days2mdhms(year, satrec.epochdays) sec_whole, sec_fraction = divmod(sec, 1.0) satrec.epochyr = year satrec.jdsatepoch = jday(year, mon, day, hr, minute, sec) try: satrec.epoch = datetime(year, mon, day, hr, minute, int(sec_whole), int(sec_fraction * 1000000.0 // 1.0)) except ValueError: # Sometimes a TLE says something like "2019 + 366.82137887 days" # which would be December 32nd which causes a ValueError. year, mon, day, hr, minute, sec = invjday(satrec.jdsatepoch) satrec.epoch = datetime(year, mon, day, hr, minute, int(sec_whole), int(sec_fraction * 1000000.0 // 1.0)) # ---------------- initialize the orbit at sgp4epoch ------------------- sgp4init(whichconst, opsmode, satrec.satnum, satrec.jdsatepoch - 2433281.5, satrec.bstar, satrec.ndot, satrec.nddot, satrec.ecco, satrec.argpo, satrec.inclo, satrec.mo, satrec.no_kozai, satrec.nodeo, satrec) return satrec
def twoline2rv(longstr1, longstr2, whichconst, afspc_mode=False): """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.earth_gravity.wgs72` - Standard WGS 72 model `sgp4.earth_gravity.wgs84` - More recent WGS 84 model `sgp4.earth_gravity.wgs72old` - Legacy support for old SGP4 behavior Normally, computations are made using various 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`. """ deg2rad = pi / 180.0 # 0.0174532925199433 xpdotp = 1440.0 / (2.0 * pi) # 229.1831180523293 tumin = whichconst.tumin satrec = Satellite() satrec.error = 0 satrec.whichconst = whichconst # Python extension: remembers its consts line = longstr1.rstrip() # try/except is not well supported by Numba if (len(line) >= 64 and line.startswith('1 ') and line[8] == ' ' and line[23] == '.' and line[32] == ' ' and line[34] == '.' and line[43] == ' ' and line[52] == ' ' and line[61] == ' ' and line[63] == ' '): _saved_satnum = satrec.satnum = int(line[2:7]) # classification = line[7] or 'U' # intldesg = line[9:17] two_digit_year = int(line[18:20]) satrec.epochdays = float(line[20:32]) satrec.ndot = float(line[33:43]) satrec.nddot = float(line[44] + '.' + line[45:50]) nexp = int(line[50:52]) satrec.bstar = float(line[53] + '.' + line[54:59]) ibexp = int(line[59:61]) # numb = int(line[62]) # elnum = int(line[64:68]) else: raise ValueError(error_message.format(1, LINE1, line)) line = longstr2.rstrip() line_format_ok = False if (len(line) >= 69 and line.startswith('2 ') and line[7] == ' ' and line[11] == '.' and line[16] == ' ' and line[20] == '.' and line[25] == ' ' and line[33] == ' ' and line[37] == '.' and line[42] == ' ' and line[46] == '.' and line[51] == ' '): satrec.satnum = int(line[2:7]) if _saved_satnum != satrec.satnum: raise ValueError('Object numbers in lines 1 and 2 do not match') satrec.inclo = float(line[8:16]) satrec.nodeo = float(line[17:25]) satrec.ecco = float('0.' + line[26:33].replace(' ', '0')) satrec.argpo = float(line[34:42]) satrec.mo = float(line[43:51]) satrec.no = float(line[52:63]) #revnum = line[63:68] #except (AssertionError, IndexError, ValueError): else: raise ValueError(error_message.format(2, LINE2, line)) # ---- find no, ndot, nddot ---- satrec.no = satrec.no / xpdotp # rad/min satrec.nddot = satrec.nddot * pow(10.0, nexp) satrec.bstar = satrec.bstar * pow(10.0, ibexp) # ---- convert to sgp4 units ---- satrec.a = pow(satrec.no * tumin, (-2.0 / 3.0)) satrec.ndot = satrec.ndot / (xpdotp * 1440.0) # ? * minperday satrec.nddot = satrec.nddot / (xpdotp * 1440.0 * 1440) # ---- find standard orbital elements ---- satrec.inclo = satrec.inclo * deg2rad satrec.nodeo = satrec.nodeo * deg2rad satrec.argpo = satrec.argpo * deg2rad satrec.mo = satrec.mo * deg2rad satrec.alta = satrec.a * (1.0 + satrec.ecco) - 1.0 satrec.altp = satrec.a * (1.0 - satrec.ecco) - 1.0 """ // ---------------------------------------------------------------- // 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 two_digit_year < 57: year = two_digit_year + 2000 else: year = two_digit_year + 1900 mon, day, hr, minute, sec = days2mdhms(year, satrec.epochdays) sec_whole, sec_fraction = divmod(sec, 1.0) satrec.epochyr = year satrec.jdsatepoch = jday(year, mon, day, hr, minute, sec) satrec.epoch = datetime(year, mon, day, hr, minute, int(sec_whole), int(sec_fraction * 1000000.0 // 1.0)) # ---------------- initialize the orbit at sgp4epoch ------------------- sgp4init(whichconst, afspc_mode, satrec.satnum, satrec.jdsatepoch - 2433281.5, satrec.bstar, satrec.ecco, satrec.argpo, satrec.inclo, satrec.mo, satrec.no, satrec.nodeo, satrec) return satrec
def __init__(self, line1, line2): self._line1 = line1 self._line2 = line2 line = line1.rstrip() # deg2rad = pi / 180.0; # 0.0174532925199433 # xpdotp = 1440.0 / (2.0 * pi); # 229.1831180523293 # tumin = wgs84.tumin try: assert line.startswith('1 ') self._satnum = int(line[2:7]) assert line[8] == ' ' two_digit_year = int(line[18:20]) assert line[23] == '.' self.epochdays = float(line[20:32]) assert line[32] == ' ' assert line[34] == '.' #self.ndot = float(line[33:43]) assert line[43] == ' ' #self.nddot = float(line[44] + '.' + line[45:50]) #nexp = int(line[50:52]) assert line[52] == ' ' #self.bstar = float(line[53] + '.' + line[54:59]) #ibexp = int(line[59:61]) assert line[61] == ' ' assert line[63] == ' ' except (AssertionError, IndexError, ValueError): raise ValueError(error_message.format(1, LINE1, line)) line = line2.rstrip() try: assert line.startswith('2 ') self._satnum = int(line[2:7]) # TODO: check it matches line 1? assert line[7] == ' ' assert line[11] == '.' #self.inclo = float(line[8:16]) assert line[16] == ' ' assert line[20] == '.' #self.nodeo = float(line[17:25]) assert line[25] == ' ' #self.ecco = float('0.' + line[26:33].replace(' ', '0')) assert line[33] == ' ' assert line[37] == '.' #self.argpo = float(line[34:42]) assert line[42] == ' ' assert line[46] == '.' #self.mo = float(line[43:51]) assert line[51] == ' ' #self.no = float(line[52:63]) #revnum = line[63:68] except (AssertionError, IndexError, ValueError): raise ValueError(error_message.format(2, LINE2, line)) # ---- find no, ndot, nddot ---- #self.no = self.no / xpdotp; # rad/min #self.nddot= self.nddot * pow(10.0, nexp); #self.bstar= self.bstar * pow(10.0, ibexp); # ---- convert to sgp4 units ---- #self.a = pow( self.no*tumin , (-2.0/3.0) ); #self.ndot = self.ndot / (xpdotp*1440.0); # ? * minperday #self.nddot= self.nddot / (xpdotp*1440.0*1440); # ---- find standard orbital elements ---- #self.inclo = self.inclo * deg2rad; #self.nodeo = self.nodeo * deg2rad; #self.argpo = self.argpo * deg2rad; #self.mo = self.mo * deg2rad; #self.alta = self.a*(1.0 + self.ecco) - 1.0; #self.altp = self.a*(1.0 - self.ecco) - 1.0; if two_digit_year < 57: year = two_digit_year + 2000; else: year = two_digit_year + 1900; mon,day,hr,minute,sec = days2mdhms(year, self.epochdays); sec_whole, sec_fraction = divmod(sec, 1.0) self.epochyr = year self.jdsatepoch = jday(year,mon,day,hr,minute,sec); self._epoch = datetime(year, mon, day, hr, minute, int(sec_whole), int(sec_fraction * 1000000.0 // 1.0), tzinfo=timezone.utc)
def twoline2rv(longstr1, longstr2, whichconst, afspc_mode=False): """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.earth_gravity.wgs72` - Standard WGS 72 model `sgp4.earth_gravity.wgs84` - More recent WGS 84 model `sgp4.earth_gravity.wgs72old` - Legacy support for old SGP4 behavior Normally, computations are made using various 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`. """ opsmode = 'a' if afspc_mode else 'i' deg2rad = pi / 180.0; # 0.0174532925199433 xpdotp = 1440.0 / (2.0 *pi); # 229.1831180523293 revnum = 0; elnum = 0; tumin = whichconst.tumin satrec = Satellite() satrec.error = 0; satrec.whichconst = whichconst # Python extension: remembers its consts # This is Python, so we convert the strings into mutable lists of # characters before setting the C++ code loose on them. longstr1 = [ c for c in longstr1 ] longstr2 = [ c for c in longstr2 ] # set the implied decimal points since doing a formated read # fixes for bad input data values (missing, ...) for j in range(10, 16): if longstr1[j] == ' ': longstr1[j] = '_'; if longstr1[44] != ' ': longstr1[43] = longstr1[44]; longstr1[44] = '.'; if longstr1[7] == ' ': longstr1[7] = 'U'; if longstr1[9] == ' ': longstr1[9] = '.'; for j in range(45, 50): if longstr1[j] == ' ': longstr1[j] = '0'; if longstr1[51] == ' ': longstr1[51] = '0'; if longstr1[53] != ' ': longstr1[52] = longstr1[53]; longstr1[53] = '.'; longstr2[25] = '.'; for j in range(26, 33): if longstr2[j] == ' ': longstr2[j] = '0'; if longstr1[62] == ' ': longstr1[62] = '0'; if longstr1[68] == ' ': longstr1[68] = '0'; # Concatenate lists back into real strings. longstr1 = ''.join(longstr1) longstr2 = ''.join(longstr2) (cardnumb,satrec.satnum,classification, intldesg, two_digit_year, satrec.epochdays,satrec.ndot, satrec.nddot, nexp, satrec.bstar, ibexp, numb, elnum) = \ sscanf(longstr1,"%2d %5ld %1c %10s %2d %12lf %11lf %7lf %2d %7lf %2d %2d %6ld ", ) if longstr2[52] == ' ': (cardnumb,satrec.satnum, satrec.inclo, satrec.nodeo,satrec.ecco, satrec.argpo, satrec.mo, satrec.no, revnum) = \ sscanf(longstr2,"%2d %5ld %9lf %9lf %8lf %9lf %9lf %10lf %6ld \n", ) else: (cardnumb,satrec.satnum, satrec.inclo, satrec.nodeo,satrec.ecco, satrec.argpo, satrec.mo, satrec.no, revnum) = \ sscanf(longstr2,"%2d %5ld %9lf %9lf %8lf %9lf %9lf %11lf %6ld \n", ) # ---- find no, ndot, nddot ---- satrec.no = satrec.no / xpdotp; # rad/min satrec.nddot= satrec.nddot * pow(10.0, nexp); satrec.bstar= satrec.bstar * pow(10.0, ibexp); # ---- convert to sgp4 units ---- satrec.a = pow( satrec.no*tumin , (-2.0/3.0) ); satrec.ndot = satrec.ndot / (xpdotp*1440.0); # ? * minperday satrec.nddot= satrec.nddot / (xpdotp*1440.0*1440); # ---- find standard orbital elements ---- satrec.inclo = satrec.inclo * deg2rad; satrec.nodeo = satrec.nodeo * deg2rad; satrec.argpo = satrec.argpo * deg2rad; satrec.mo = satrec.mo * deg2rad; satrec.alta = satrec.a*(1.0 + satrec.ecco) - 1.0; satrec.altp = satrec.a*(1.0 - satrec.ecco) - 1.0; """ // ---------------------------------------------------------------- // 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 two_digit_year < 57: year = two_digit_year + 2000; else: year = two_digit_year + 1900; mon,day,hr,minute,sec = days2mdhms(year, satrec.epochdays); sec_whole, sec_fraction = divmod(sec, 1.0) satrec.epochyr = year satrec.jdsatepoch = jday(year,mon,day,hr,minute,sec); satrec.epoch = datetime(year, mon, day, hr, minute, int(sec_whole), int(sec_fraction * 1000000.0 // 1.0)) # ---------------- initialize the orbit at sgp4epoch ------------------- sgp4init( whichconst, opsmode, satrec.satnum, satrec.jdsatepoch-2433281.5, satrec.bstar, satrec.ecco, satrec.argpo, satrec.inclo, satrec.mo, satrec.no, satrec.nodeo, satrec); return satrec
def get_sat_epoch(y, d): y += 2000 return sum(jday(y, *days2mdhms(y, d)))
def twoline2rv(longstr1, longstr2, whichconst, afspc_mode=False): """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.earth_gravity.wgs72` - Standard WGS 72 model `sgp4.earth_gravity.wgs84` - More recent WGS 84 model `sgp4.earth_gravity.wgs72old` - Legacy support for old SGP4 behavior Normally, computations are made using various 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`. """ opsmode = 'a' if afspc_mode else 'i' deg2rad = pi / 180.0; # 0.0174532925199433 xpdotp = 1440.0 / (2.0 *pi); # 229.1831180523293 tumin = whichconst.tumin satrec = Satellite() satrec.error = 0; satrec.whichconst = whichconst # Python extension: remembers its consts line = longstr1.rstrip() try: assert line.startswith('1 ') satrec.satnum = int(line[2:7]) # classification = line[7] or 'U' assert line[8] == ' ' # intldesg = line[9:17] two_digit_year = int(line[18:20]) assert line[23] == '.' satrec.epochdays = float(line[20:32]) assert line[32] == ' ' assert line[34] == '.' satrec.ndot = float(line[33:43]) assert line[43] == ' ' satrec.nddot = float(line[44] + '.' + line[45:50]) nexp = int(line[50:52]) assert line[52] == ' ' satrec.bstar = float(line[53] + '.' + line[54:59]) ibexp = int(line[59:61]) assert line[61] == ' ' assert line[63] == ' ' # numb = int(line[62]) # elnum = int(line[64:68]) except (AssertionError, IndexError, ValueError): raise ValueError(error_message.format(1, LINE1, line)) line = longstr2.rstrip() try: assert line.startswith('2 ') satrec.satnum = int(line[2:7]) # TODO: check it matches line 1? assert line[7] == ' ' assert line[11] == '.' satrec.inclo = float(line[8:16]) assert line[16] == ' ' assert line[20] == '.' satrec.nodeo = float(line[17:25]) assert line[25] == ' ' satrec.ecco = float('0.' + line[26:33].replace(' ', '0')) assert line[33] == ' ' assert line[37] == '.' satrec.argpo = float(line[34:42]) assert line[42] == ' ' assert line[46] == '.' satrec.mo = float(line[43:51]) assert line[51] == ' ' satrec.no = float(line[52:63]) #revnum = line[63:68] except (AssertionError, IndexError, ValueError): raise ValueError(error_message.format(2, LINE2, line)) # ---- find no, ndot, nddot ---- satrec.no = satrec.no / xpdotp; # rad/min satrec.nddot= satrec.nddot * pow(10.0, nexp); satrec.bstar= satrec.bstar * pow(10.0, ibexp); # ---- convert to sgp4 units ---- satrec.a = pow( satrec.no*tumin , (-2.0/3.0) ); satrec.ndot = satrec.ndot / (xpdotp*1440.0); # ? * minperday satrec.nddot= satrec.nddot / (xpdotp*1440.0*1440); # ---- find standard orbital elements ---- satrec.inclo = satrec.inclo * deg2rad; satrec.nodeo = satrec.nodeo * deg2rad; satrec.argpo = satrec.argpo * deg2rad; satrec.mo = satrec.mo * deg2rad; satrec.alta = satrec.a*(1.0 + satrec.ecco) - 1.0; satrec.altp = satrec.a*(1.0 - satrec.ecco) - 1.0; """ // ---------------------------------------------------------------- // 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 two_digit_year < 57: year = two_digit_year + 2000; else: year = two_digit_year + 1900; mon,day,hr,minute,sec = days2mdhms(year, satrec.epochdays); sec_whole, sec_fraction = divmod(sec, 1.0) satrec.epochyr = year satrec.jdsatepoch = jday(year,mon,day,hr,minute,sec); satrec.epoch = datetime(year, mon, day, hr, minute, int(sec_whole), int(sec_fraction * 1000000.0 // 1.0)) # ---------------- initialize the orbit at sgp4epoch ------------------- sgp4init(whichconst, opsmode, satrec.satnum, satrec.jdsatepoch-2433281.5, satrec.bstar, satrec.ecco, satrec.argpo, satrec.inclo, satrec.mo, satrec.no, satrec.nodeo, satrec) return satrec
def twoline2rv(longstr1, longstr2, whichconst, afspc_mode=False): deg2rad = pi / 180.0; # 0.0174532925199433 xpdotp = 1440.0 / (2.0 *pi); # 229.1831180523293 tumin = whichconst.tumin satrec = Satellite() satrec.error = 0; satrec.whichconst = whichconst # Python extension: remembers its consts line = longstr1.rstrip() # try/except is not well supported by Numba if (len(line) >= 64 and line.startswith('1 ') and line[8] == ' ' and line[23] == '.' and line[32] == ' ' and line[34] == '.' and line[43] == ' ' and line[52] == ' ' and line[61] == ' ' and line[63] == ' '): _saved_satnum = satrec.satnum = int(line[2:7]) # classification = line[7] or 'U' # intldesg = line[9:17] two_digit_year = int(line[18:20]) satrec.epochdays = float(line[20:32]) satrec.ndot = float(line[33:43]) satrec.nddot = float(line[44] + '.' + line[45:50]) nexp = int(line[50:52]) satrec.bstar = float(line[53] + '.' + line[54:59]) ibexp = int(line[59:61]) # numb = int(line[62]) # elnum = int(line[64:68]) else: raise ValueError(error_message.format(1, LINE1, line)) line = longstr2.rstrip() if (len(line) >= 69 and line.startswith('2 ') and line[7] == ' ' and line[11] == '.' and line[16] == ' ' and line[20] == '.' and line[25] == ' ' and line[33] == ' ' and line[37] == '.' and line[42] == ' ' and line[46] == '.' and line[51] == ' '): satrec.satnum = int(line[2:7]) if _saved_satnum != satrec.satnum: raise ValueError('Object numbers in lines 1 and 2 do not match') satrec.inclo = float(line[8:16]) satrec.nodeo = float(line[17:25]) satrec.ecco = float('0.' + line[26:33].replace(' ', '0')) satrec.argpo = float(line[34:42]) satrec.mo = float(line[43:51]) satrec.no = float(line[52:63]) #revnum = line[63:68] #except (AssertionError, IndexError, ValueError): else: raise ValueError(error_message.format(2, LINE2, line)) # ---- find no, ndot, nddot ---- satrec.no = satrec.no / xpdotp; # rad/min satrec.nddot= satrec.nddot * pow(10.0, nexp); satrec.bstar= satrec.bstar * pow(10.0, ibexp); # ---- convert to sgp4 units ---- satrec.a = pow( satrec.no*tumin , (-2.0/3.0) ); satrec.ndot = satrec.ndot / (xpdotp*1440.0); # ? * minperday satrec.nddot= satrec.nddot / (xpdotp*1440.0*1440); # ---- find standard orbital elements ---- satrec.inclo = satrec.inclo * deg2rad; satrec.nodeo = satrec.nodeo * deg2rad; satrec.argpo = satrec.argpo * deg2rad; satrec.mo = satrec.mo * deg2rad; satrec.alta = satrec.a*(1.0 + satrec.ecco) - 1.0; satrec.altp = satrec.a*(1.0 - satrec.ecco) - 1.0; if two_digit_year < 57: year = two_digit_year + 2000; else: year = two_digit_year + 1900; mon,day,hr,minute,sec = days2mdhms(year, satrec.epochdays); sec_whole, sec_fraction = divmod(sec, 1.0) satrec.epochyr = year satrec.jdsatepoch = jday(year,mon,day,hr,minute,sec); satrec.epoch = datetime(year, mon, day, hr, minute, int(sec_whole), int(sec_fraction * 1000000.0 // 1.0)) # ---------------- initialize the orbit at sgp4epoch ------------------- sgp4init(whichconst, afspc_mode, satrec.satnum, satrec.jdsatepoch-2433281.5, satrec.bstar, satrec.ecco, satrec.argpo, satrec.inclo, satrec.mo, satrec.no, satrec.nodeo, satrec) return satrec
def get_satepoch(y, d): """ Compute satellite epoch Julian date """ y += 2000 return sum(jday(y, *days2mdhms(y, d)))