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#!/usr/bin/env python
import ephem
import time
import os
from MmdDb import Db
def createJavaArray (point_list, name):
astring = '''var {0} = new Array (\n'''.format (name)
astring = '{0}\tnew Array ('.format (astring)
last = 'west'
for point in point_list:
if point[0][0] == '-':
if last == 'east':
astring = astring[:-1]
astring = '{0}\n\t\t),\n\tnew Array ('.format (astring)
last = 'west'
else:
last = 'east'
astring = '{0}\n\t\tnew OpenLayers.LonLat ({1}, {2}).transform (from, to),'.format (astring, point[0], point[1])
if astring[-1] == ',':
astring = astring[:-1]
astring = '{0}\n\t\t)\n\t);'.format (astring)
return astring
def dms2degdec (lonlat):
'''
convert a position argument from Deg:Min:Sec.Frac to
Deg.Frac
'''
parts = lonlat.split (':')
if len (parts) != 3:
return 0.0
degrees = float (parts[0])
fraction = (float (parts[1]) * 60.0 + float (parts[2])) / 3600
if parts[0][0] == '-':
return degrees - fraction
return degrees + fraction
class Satellite:
def __init__ (self):
self.name = 'RADIOSCAF-B/ARISSAT-1'
self.tle_filename = '/usr/local/mmd/tles/current'
self.db = Db ()
def getCurrentSSP (self):
pass
def getTrajectoryAsJavaArray (self, minutes = 180):
pass
def _loadTrajectory (self, minutes):
pass
def _loadCurrentSSP (self):
pass
def computeTrajectory (self):
sat = ephem.readtle (self._tle[0], self._tle[1], self._tle[2])
graz = ephem.Observer ()
graz.long, graz.lat, graz.elevation = 15.44226, 47.06576, 376
latest = self.db.satelliteGetLatestSSP ()
if latest:
timestamp = int (latest['timestamp']) + 60
else:
timestamp = int (time.strftime ('%s')) + 60
while timestamp % 60 != 0:
timestamp += 1
print graz.date
for i in range (60 * 5):
graz.date = time.strftime ('%Y/%m/%d %H:%M:%S', time.gmtime (timestamp))
sat.compute (graz)
self.db.satelliteInsertNewSSP (timestamp, dms2degdec (sat.sublong.__str__ ()), dms2degdec (sat.sublat.__str__ ()))
# print timestamp, dms2degdec (sat.sublong.__str__ ()), dms2degdec (sat.sublat.__str__ ()), graz.date, time.strftime ('%Y/%m/%d %H:%M:%S', time.localtime (timestamp))
timestamp += 60
return True
def _loadTLE (self):
try:
tle = open (self.tle_filename, 'r')
except IOError:
return False
self._tle = []
count = 0
for line in tle.readlines ():
self._tle.append (line)
count += 1
if count != 3:
return False
return True
if __name__ == "__main__":
satellite = Satellite ()
try:
assert satellite._loadTLE (), 'loading TLE failed'
print satellite._tle
assert satellite.computeTrajectory (), 'computing trajectory failed'
except AssertionError as e:
print 'Error: {0}'.format (e)
# vim: tw=0 ts=2
# EOF
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