def determine_satellite_visibility(sat, gs, gs_tz, gs_start, gs_end, night):
satnum = sat[0]
saturl = "http://www.celestrak.com/cgi-bin/TLE.pl?CATNR=%s" % satnum
st = SatelliteTle(satnum, tle_url=saturl)
[suntimes, pentimes, umtimes] = st.compute_sun_times(gs_start, gs_end)
ic = InviewCalculator(gs, st)
inviews = ic.compute_inviews(gs_start, gs_end)
intersections = []
for inview in inviews:
i1 = intersect_times(night, inview)
if (i1 is not None):
#print_span(gs_tz, i1)
for suntime in suntimes:
i2 = intersect_times(i1, suntime)
if (i2 is not None):
#print_span(gs_tz, i2)
i2startmjd = Time(i2[0]).mjd
href = "http://www.heavens-above.com/passdetails.aspx?lat=%f&lng=%f&loc=%s&alt=%f&tz=%s&satid=%d&mjd=%f" % \
(gs.get_latitude(), gs.get_longitude(), gs.get_name(), gs.get_elevation_in_meters(), gs.get_tz().localize(datetime(i2[0].year, i2[0].month, i2[0].day)).tzname(), satnum, i2startmjd)
intersections.append([
"<a href=%s>%s (mag:%s) %s %s-%s%s</a>" %
(href, satnum, sat[1], st.get_satellite_name(),
st.get_launch_year(), st.get_launch_year_number(),
st.get_launch_piece()), i2
])
#print_debug_times(gs_tz, satnum, night, suntimes, inviews)
return intersections
def main():
"""Main function... makes 'forward declarations' of helper functions unnecessary"""
# Constants
satnum = 25544 # ISS = 25544
saturl="http://www.celestrak.com/NORAD/elements/stations.txt"
our_tzname = 'US/Eastern'
# Times we need
now = datetime.now()
our_tz = timezone(our_tzname)
our_today_start = our_tz.localize(datetime(now.year, now.month, now.day, \
0, 0, 0))
our_today_end = our_tz.localize(datetime(now.year, now.month, now.day, \
23, 59, 59))
st = SatelliteTle(satnum, tle_url=saturl)
tables = st.compute_sun_times(our_today_start, our_today_end)
print_sun_times_table(st, our_today_start, our_today_end, tables)
def main():
"""Main function... makes 'forward declarations' of helper functions unnecessary"""
parser = argparse.ArgumentParser()
parser.add_argument("-s", "--satnum", help="Specify satellite number (e.g. 25544=ISS, 43852=STF-1)", \
type=int, metavar="[1-99999]", choices=range(1,99999), default=43852)
parser.add_argument("-t",
"--time",
help="Specify date/time (UTC)",
type=ArgValidator.validate_datetime,
metavar="YYYY-MM-DDTHH:MM:SS",
default=datetime.now())
parser.add_argument("-r", "--endtime", help="Specify date time range with this end date/time (UTC)", \
type=ArgValidator.validate_datetime, metavar="YYYY-MM-DDTHH:MM:SS", default=None)
parser.add_argument("-d", "--timestep", help="Specify time step (delta) in seconds for tabular data", \
type=int, metavar="[1-86400]", choices=range(1,86400), default=60)
parser.add_argument("-p",
"--tle",
help="Print TLE information",
action="store_true")
parser.add_argument("-u",
"--sun",
help="Print sun/umbra/penumbra information",
action="store_true")
parser.add_argument("-e",
"--ecef",
help="Print ECEF ephemeris",
action="store_true")
parser.add_argument("-i",
"--eci",
help="Print ECI ephemeris",
action="store_true")
parser.add_argument(
"-l",
"--lla",
help=
"Print latitude, longitude, altitude (geodetic degrees, altitude in km above WGS-84 ellipsoid) ephemeris",
action="store_true")
parser.add_argument(
"-f",
"--file",
help="TLE file to use (instead of looking up the TLE on CelesTrak)",
type=ArgValidator.validate_file,
default=None)
parser.add_argument("-m",
"--mag",
help="Print geomagnetic data",
action="store_true")
parser.add_argument("-a",
"--aer",
help="Print az/el/range from ground station",
action="store_true")
parser.add_argument("-x", "--longitude", help="Specify longitude (degrees) of ground station", \
type=float, default=-79.825518056)
parser.add_argument("-y", "--latitude", help="Specify latitude (degrees) of ground station", \
type=float, default=38.43685028)
parser.add_argument("-z", "--elevation", help="Specify elevation (meters) of ground station", \
type=float, default=842.0)
parser.add_argument("-v",
"--iirv",
help="Print improved interrange vector (IIRV) format",
action="store_true")
args = parser.parse_args()
if (args.file is not None):
st = SatelliteTle(args.satnum, tle_file=args.file)
else:
saturl = "http://www.celestrak.com/cgi-bin/TLE.pl?CATNR=%s" % args.satnum
st = SatelliteTle(args.satnum, tle_url=saturl)
if (args.tle):
print_tle_data(st)
if (args.eci):
if (args.endtime is None):
point = st.compute_ephemeris_point(args.time)
print_ephemeris_point(st, point)
else:
table = st.compute_ephemeris_table(args.time, args.endtime,
args.timestep)
print_ephemeris_table(st, table)
if (args.ecef):
#print "ECEF is not implemented"
if (args.endtime is None):
point = st.compute_ephemeris_point(args.time)
print_ephemeris_point(st, point, False)
else:
table = st.compute_ephemeris_table(args.time, args.endtime,
args.timestep)
print_ephemeris_table(st, table, False)
if (args.lla):
if (args.endtime is None):
llap = st.compute_lonlatalt_point(args.time)
print_lonlatalt(st, llap)
else:
table = st.compute_lonlatalt_table(args.time, args.endtime,
args.timestep)
print_lonlatalt_table(st, table)
if (args.mag):
if (args.endtime is None):
llap = st.compute_lonlatalt_point(args.time)
print_mag(st, llap)
else:
table = st.compute_lonlatalt_table(args.time, args.endtime,
args.timestep)
print_mag_table(st, table)
if (args.aer):
gs = GroundStation(lat=args.latitude,
lon=args.longitude,
el_meters=args.elevation)
ic = InviewCalculator(gs, st)
if (args.endtime is None):
args.endtime = args.time
azels = ic.compute_azels(args.time, args.endtime, args.timestep)
print_azelrange_table(azels)
if (args.sun):
if (args.endtime is None):
sun_state = st.get_satellite_sun_state(args.time)
if (sun_state == st.InSun):
in_sun = "in sun"
elif (sun_state == st.InPenumbra):
in_sun = "in penumbra"
else:
in_sun = "in umbra"
print("===== SUN =====")
print("Satellite is %s" % in_sun)
else:
tables = st.compute_sun_times(args.time, args.endtime)
print_sun_times_table(st, args.time, args.endtime, tables)
if (args.iirv):
if (args.endtime is None):
point = st.compute_ephemeris_point(args.time)
print_iirv_point(st, point)
else:
table = st.compute_ephemeris_table(args.time, args.endtime,
args.timestep)
print_iirv_points(st, table)