Add pass.py
Fabian P. Schmidt
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8374213939
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@ -16,3 +16,8 @@
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```
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./ground_track.py ../examples/sathyabamasat.txt
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```
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- Calculate and plot satellite passes (requires a site.txt)
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```
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./pass.py ../examples/sathyabamasat.txt $ST_DATADIR/sites.txt -s 7300 --starttime 2019-11-06T19:30:00
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```
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@ -0,0 +1,158 @@
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#!/usr/bin/env python
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"""
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Script to calculate the next passes of a given satellite (from TLE) at a given location
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"""
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import sys
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import argparse
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from datetime import datetime
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import numpy as np
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import matplotlib.pyplot as plt
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from astropy import units as u
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from beyond.dates import Date, timedelta
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from beyond.env.jpl import get_orbit
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from beyond.io.tle import Tle
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from beyond.frames import create_station
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from beyond.config import config
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from utils import tle_from_file, read_site_file
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def polar_plot(pass_data):
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plt.figure()
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ax = plt.subplot(111, projection='polar')
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ax.set_theta_direction(-1)
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ax.set_theta_zero_location('N')
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plt.plot(np.radians(pass_data['azims']), pass_data['elevs'], '-')
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pass_data['meta'] = {}
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for i, event in enumerate(pass_data['event']):
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if event:
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if event.info == 'AOS':
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style = 'ro'
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pass_data['meta'].update({'AOS': i})
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elif event.info == 'MAX':
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style = 'go'
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pass_data['meta'].update({'MAX': i})
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elif event.info == 'LOS':
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style = 'bo'
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pass_data['meta'].update({'LOS': i})
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else:
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style = 'bo'
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plt.plot(np.radians(pass_data['azims'][i]), pass_data['elevs'][i], style)
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ax.set_yticks(range(0, 90, 20))
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ax.set_yticklabels(map(str, range(90, 0, -20)))
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ax.set_rmax(90)
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try:
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aos_str = pass_data['date'][pass_data['meta']['AOS']].datetime.strftime('%H:%M:%S')
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max_str = pass_data['date'][pass_data['meta']['MAX']].datetime.strftime('%H:%M:%S')
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los_str = pass_data['date'][pass_data['meta']['LOS']].datetime.strftime('%H:%M:%S')
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textstr = 'AOS {}\nMAX {}\n LOS {}'.format(aos_str, max_str, los_str)
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ax.text(0.05,
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0.95,
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textstr,
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transform=ax.transAxes,
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fontsize=14,
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verticalalignment='top',
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bbox={'boxstyle': 'round',
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'facecolor': 'white',
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'alpha': 0.5})
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except KeyError:
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# TODO: Fix partial passes
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pass
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plt.show()
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if __name__ == '__main__':
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# Parse arguments
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parser = argparse.ArgumentParser(
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description="Compute the next passes of a satellite at a given location")
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parser.add_argument('TLEFILE', help="the tle file", type=str)
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parser.add_argument('SITEFILE', help="the site catalog file", type=str)
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parser.add_argument("-s",
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"--site",
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help="COSPAR_ID (must be present in sites.txt",
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type=int)
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parser.add_argument("-t",
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"--starttime",
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help="Start time (YYYY-MM-DDTHH:MM:SS) [default: now]",
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default=datetime.utcnow().strftime("%Y-%m-%dT%H:%M:%S"))
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parser.add_argument("-d",
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"--duration",
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help="Duration to search for passes [hours; default: 1.0]",
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type=float,
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default=1.0)
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args = parser.parse_args()
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sites = read_site_file(args.SITEFILE)
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if not args.site in sites.keys():
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print("ERROR: Site {} not found in {}.".format(args.site, args.SITEFILE))
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sys.exit(-1)
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site = sites[args.site]
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tle, name = tle_from_file(args.TLEFILE)
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orbit = tle.orbit()
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# Station definition
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station = create_station(site['symbol'], (site['latitude'].to(u.deg).value,
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site['longitude'].to(u.deg).value,
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site['altitude'].to(u.m).value))
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starttime = datetime.strptime(args.starttime, '%Y-%m-%dT%H:%M:%S')
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pass_data = {'azims': [],
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'elevs': [],
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'date': [],
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'r': [],
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'r_dot': [],
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'event': []}
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print(" Time Azim Elev Distance Radial Velocity")
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print("=========================================================")
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for orb in station.visibility(orbit,
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start=Date(starttime),
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stop=timedelta(hours=args.duration),
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step=timedelta(seconds=30),
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events=True):
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elev = np.degrees(orb.phi)
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# Radians are counterclockwise and azimuth is clockwise
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azim = np.degrees(-orb.theta) % 360
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# Archive for plotting
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pass_data['azims'].append(azim)
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# Matplotlib actually force 0 to be at the center of the polar plot,
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# so we trick it by inverting the values
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pass_data['elevs'].append(90 - elev)
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pass_data['date'].append(orb.date)
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pass_data['r'].append(orb.r)
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pass_data['r_dot'].append(orb.r_dot)
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pass_data['event'].append(orb.event)
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r = orb.r / 1000.
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print("{event:7} {orb.date:%H:%M:%S} {azim:7.2f} {elev:7.2f} {r:10.2f} {orb.r_dot:10.2f}".format(
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orb=orb, r=r, azim=azim, elev=elev, event=orb.event.info if orb.event is not None else ""
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))
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if orb.event and orb.event.info.startswith("LOS"):
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# End of the pass, plot the result and
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# clear the arrays for the next pass
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print()
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polar_plot(pass_data)
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pass_data = {'azims': [],
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'elevs': [],
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'date': [],
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'r': [],
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'r_dot': [],
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'event': []}
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# Plot the last (incomplete) pass
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if pass_data['azims']:
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polar_plot(pass_data)
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@ -0,0 +1,34 @@
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import csv
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from beyond.io.tle import Tle
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from astropy import units as u
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def tle_from_file(filename):
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'''
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Returns: TLE:Tle, Object name:str
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'''
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with open(filename, 'r') as f:
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lines = f.readlines()
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return Tle(''.join(lines)), lines[0].strip()
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def read_site_file(filename):
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sites = {}
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with open(filename, newline='') as f:
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reader = csv.reader(f,
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delimiter=' ',
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quoting=csv.QUOTE_NONE,
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skipinitialspace=True)
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for row in reader:
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if row[0][0] == '#':
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continue
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sites[int(row[0])] = {'symbol': row[1],
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'latitude': float(row[2]) * u.deg,
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'longitude': float(row[3]) * u.deg,
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'altitude': float(row[4]) * u.m,
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'name': ' '.join(row[5:])}
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return sites
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