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tlefile.py
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tlefile.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2011 - 2018
#
# Author(s):
#
# Esben S. Nielsen <esn@dmi.dk>
# Martin Raspaud <martin.raspaud@smhi.se>
# Panu Lahtinen <panu.lahtinen@fmi.fi>
# Will Evonosky <william.evonosky@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Classes and functions for handling TLE files."""
import io
import logging
import datetime as dt
try:
from urllib2 import urlopen
except ImportError:
from urllib.request import urlopen
import os
import glob
import numpy as np
import requests
import sqlite3
TLE_URLS = ('http://www.celestrak.com/NORAD/elements/active.txt',
'http://celestrak.com/NORAD/elements/weather.txt',
'http://celestrak.com/NORAD/elements/resource.txt',
'https://www.celestrak.com/NORAD/elements/cubesat.txt',
'http://celestrak.com/NORAD/elements/stations.txt',
'https://www.celestrak.com/NORAD/elements/sarsat.txt',
'https://www.celestrak.com/NORAD/elements/noaa.txt',
'https://www.celestrak.com/NORAD/elements/amateur.txt',
'https://www.celestrak.com/NORAD/elements/engineering.txt')
LOGGER = logging.getLogger(__name__)
PKG_CONFIG_DIR = os.path.join(os.path.realpath(os.path.dirname(__file__)), 'etc')
def read_platform_numbers(in_upper=False, num_as_int=False):
"""Read platform numbers from $PPP_CONFIG_DIR/platforms.txt."""
out_dict = {}
os.getenv('PPP_CONFIG_DIR', PKG_CONFIG_DIR)
platform_file = None
if 'PPP_CONFIG_DIR' in os.environ:
platform_file = os.path.join(os.environ['PPP_CONFIG_DIR'], 'platforms.txt')
if not platform_file or not os.path.isfile(platform_file):
platform_file = os.path.join(PKG_CONFIG_DIR, 'platforms.txt')
try:
fid = open(platform_file, 'r')
except IOError:
LOGGER.error("Platform file %s not found.", platform_file)
return out_dict
for row in fid:
# skip comment lines
if not row.startswith('#'):
parts = row.split()
if len(parts) < 2:
continue
if in_upper:
parts[0] = parts[0].upper()
if num_as_int:
parts[1] = int(parts[1])
out_dict[parts[0]] = parts[1]
fid.close()
return out_dict
SATELLITES = read_platform_numbers(in_upper=True, num_as_int=False)
"""
The platform numbers are given in a file $PPP_CONFIG/platforms.txt
in the following format:
.. literalinclude:: ../../etc/platforms.txt
:language: text
:lines: 4-
"""
def read(platform, tle_file=None, line1=None, line2=None):
"""Read TLE for *platform*.
The data are read from *tle_file*, from *line1* and *line2*, from
the newest file provided in the TLES pattern, or from internet if
none is provided.
"""
return Tle(platform, tle_file=tle_file, line1=line1, line2=line2)
def fetch(destination):
"""Fetch TLE from internet and save it to `destination`."""
with io.open(destination, mode="w", encoding="utf-8") as dest:
for url in TLE_URLS:
response = urlopen(url)
dest.write(response.read().decode("utf-8"))
class ChecksumError(Exception):
"""ChecksumError."""
pass
class Tle(object):
"""Class holding TLE objects."""
def __init__(self, platform, tle_file=None, line1=None, line2=None):
"""Init."""
self._platform = platform.strip().upper()
self._tle_file = tle_file
self._line1 = line1
self._line2 = line2
self.satnumber = None
self.classification = None
self.id_launch_year = None
self.id_launch_number = None
self.id_launch_piece = None
self.epoch_year = None
self.epoch_day = None
self.epoch = None
self.mean_motion_derivative = None
self.mean_motion_sec_derivative = None
self.bstar = None
self.ephemeris_type = None
self.element_number = None
self.inclination = None
self.right_ascension = None
self.excentricity = None
self.arg_perigee = None
self.mean_anomaly = None
self.mean_motion = None
self.orbit = None
self._read_tle()
self._checksum()
self._parse_tle()
@property
def line1(self):
"""Return first TLE line."""
return self._line1
@property
def line2(self):
"""Return second TLE line."""
return self._line2
@property
def platform(self):
"""Return satellite platform name."""
return self._platform
def _checksum(self):
"""Calculate checksum for the current TLE."""
for line in [self._line1, self._line2]:
check = 0
for char in line[:-1]:
if char.isdigit():
check += int(char)
if char == "-":
check += 1
if (check % 10) != int(line[-1]):
raise ChecksumError(self._platform + " " + line)
def _read_tle(self):
"""Read TLE data."""
if self._line1 is not None and self._line2 is not None:
tle = self._line1.strip() + "\n" + self._line2.strip()
else:
def _open(filename):
return io.open(filename, 'rb')
if self._tle_file:
urls = (self._tle_file,)
open_func = _open
elif "TLES" in os.environ:
# TODO: get the TLE file closest in time to the actual satellite
# overpass, NOT the latest!
urls = (max(glob.glob(os.environ["TLES"]),
key=os.path.getctime), )
LOGGER.debug("Reading TLE from %s", urls[0])
open_func = _open
else:
LOGGER.debug("Fetch TLE from the internet.")
urls = TLE_URLS
open_func = urlopen
tle = ""
designator = "1 " + SATELLITES.get(self._platform, '')
for url in urls:
fid = open_func(url)
for l_0 in fid:
l_0 = l_0.decode('utf-8')
if l_0.strip() == self._platform:
l_1 = next(fid).decode('utf-8')
l_2 = next(fid).decode('utf-8')
tle = l_1.strip() + "\n" + l_2.strip()
break
if(self._platform in SATELLITES and
l_0.strip().startswith(designator)):
l_1 = l_0
l_2 = next(fid).decode('utf-8')
tle = l_1.strip() + "\n" + l_2.strip()
LOGGER.debug("Found platform %s, ID: %s",
self._platform,
SATELLITES[self._platform])
break
fid.close()
if tle:
break
if not tle:
raise KeyError("Found no TLE entry for '%s'" % self._platform)
self._line1, self._line2 = tle.split('\n')
def _parse_tle(self):
"""Parse values from TLE data."""
def _read_tle_decimal(rep):
"""Convert *rep* to decimal value."""
if rep[0] in ["-", " ", "+"]:
digits = rep[1:-2].strip()
val = rep[0] + "." + digits + "e" + rep[-2:]
else:
digits = rep[:-2].strip()
val = "." + digits + "e" + rep[-2:]
return float(val)
self.satnumber = self._line1[2:7]
self.classification = self._line1[7]
self.id_launch_year = self._line1[9:11]
self.id_launch_number = self._line1[11:14]
self.id_launch_piece = self._line1[14:17]
self.epoch_year = self._line1[18:20]
self.epoch_day = float(self._line1[20:32])
self.epoch = \
np.datetime64(dt.datetime.strptime(self.epoch_year, "%y") +
dt.timedelta(days=self.epoch_day - 1), 'us')
self.mean_motion_derivative = float(self._line1[33:43])
self.mean_motion_sec_derivative = _read_tle_decimal(self._line1[44:52])
self.bstar = _read_tle_decimal(self._line1[53:61])
try:
self.ephemeris_type = int(self._line1[62])
except ValueError:
self.ephemeris_type = 0
self.element_number = int(self._line1[64:68])
self.inclination = float(self._line2[8:16])
self.right_ascension = float(self._line2[17:25])
self.excentricity = int(self._line2[26:33]) * 10 ** -7
self.arg_perigee = float(self._line2[34:42])
self.mean_anomaly = float(self._line2[43:51])
self.mean_motion = float(self._line2[52:63])
self.orbit = int(self._line2[63:68])
def __str__(self):
"""Format the class data for printing."""
import pprint
import sys
if sys.version_info < (3, 0):
from StringIO import StringIO
else:
from io import StringIO
s_var = StringIO()
d_var = dict(([(k, v) for k, v in
list(self.__dict__.items()) if k[0] != '_']))
pprint.pprint(d_var, s_var)
return s_var.getvalue()[:-1]
PLATFORM_NAMES_TABLE = "(satid text primary key, platform_name text)"
SATID_TABLE = ("'{}' (epoch date primary key, tle text, insertion_time date,"
" source text)")
SATID_VALUES = "INSERT INTO '{}' VALUES (?, ?, ?, ?)"
PLATFORM_VALUES = "INSERT INTO platform_names VALUES (?, ?)"
ISO_TIME_FORMAT = "%Y-%m-%dT%H:%M:%S.%f"
class Downloader(object):
"""Class for downloading TLE data."""
def __init__(self, config):
"""Init."""
self.config = config
def fetch_plain_tle(self):
"""Fetch plain text-formated TLE data."""
tles = {}
if "fetch_plain_tle" in self.config["downloaders"]:
sources = self.config["downloaders"]["fetch_plain_tle"]
for source in sources:
tles[source] = []
failures = []
for uri in sources[source]:
req = requests.get(uri)
if req.status_code == 200:
tles[source] += self.parse_tles(req.text)
else:
failures.append(uri)
if len(failures) > 0:
logging.error(
"Could not fetch TLEs from %s, %d failure(s): [%s]",
source, len(failures), ', '.join(failures))
logging.info("Downloaded %d TLEs from %s",
len(tles[source]), source)
return tles
def fetch_spacetrack(self):
"""Fetch TLE data from Space-Track."""
tles = []
login_url = "https://www.space-track.org/ajaxauth/login"
download_url = ("https://www.space-track.org/basicspacedata/query/"
"class/tle_latest/ORDINAL/1/NORAD_CAT_ID/%s/format/"
"tle")
download_url = download_url % ','.join(
[str(key) for key in self.config['platforms']])
user = self.config["downloaders"]["fetch_spacetrack"]["user"]
password = self.config["downloaders"]["fetch_spacetrack"]["password"]
credentials = {"identity": user, "password": password}
with requests.Session() as session:
# Login
req = session.post(login_url, data=credentials)
if req.status_code != 200:
logging.error("Could not login to Space-Track")
return tles
# Get the data
req = session.get(download_url)
if req.status_code == 200:
tles += self.parse_tles(req.text)
else:
logging.error("Could not retrieve TLEs from Space-Track")
logging.info("Downloaded %d TLEs from %s", len(tles), "spacetrack")
return tles
def read_tle_files(self):
"""Read TLE data from files."""
paths = self.config["downloaders"]["read_tle_files"]["paths"]
# Collect filenames
fnames = []
for path in paths:
if '*' in path:
fnames += glob.glob(path)
else:
if not os.path.exists(path):
logging.error("File %s doesn't exist.", path)
continue
fnames += [path]
tles = []
for fname in fnames:
with open(fname, 'r') as fid:
data = fid.read()
tles += self.parse_tles(data)
logging.info("Loaded %d TLEs from local files", len(tles))
return tles
def parse_tles(self, raw_data):
"""Parse all the TLEs in the given raw text data."""
tles = []
line1, line2 = None, None
raw_data = raw_data.split('\n')
for row in raw_data:
if row.startswith('1 '):
line1 = row
elif row.startswith('2 '):
line2 = row
else:
continue
if line1 is not None and line2 is not None:
try:
tle = Tle('', line1=line1, line2=line2)
except ValueError:
logging.warning(
"Invalid data found - line1: %s, line2: %s",
line1, line2)
else:
tles.append(tle)
line1, line2 = None, None
return tles
class SQLiteTLE(object):
"""Store TLE data in a sqlite3 database."""
def __init__(self, db_location, platforms, writer_config):
"""Init."""
self.db = sqlite3.connect(db_location)
self.platforms = platforms
self.writer_config = writer_config
self.updated = False
# Create platform_names table if it doesn't exist
if not table_exists(self.db, "platform_names"):
cmd = "CREATE TABLE platform_names " + PLATFORM_NAMES_TABLE
with self.db:
self.db.execute(cmd)
logging.info("Created database table 'platform_names'")
def update_db(self, tle, source):
"""Update the collected data.
Only data with newer epoch than the existing one is used.
"""
num = int(tle.satnumber)
if num not in self.platforms:
return
tle.platform_name = self.platforms[num]
if not table_exists(self.db, num):
cmd = "CREATE TABLE " + SATID_TABLE.format(num)
with self.db:
self.db.execute(cmd)
logging.info("Created database table '%d'", num)
cmd = ""
with self.db:
self.db.execute(PLATFORM_VALUES, (num, self.platforms[num]))
logging.info("Added platform name '%s' for ID '%d'",
self.platforms[num], num)
cmd = SATID_VALUES.format(num)
epoch = tle.epoch.item().isoformat()
tle = '\n'.join([tle.line1, tle.line2])
now = dt.datetime.utcnow().isoformat()
try:
with self.db:
self.db.execute(cmd, (epoch, tle, now, source))
logging.info("Added TLE for %d (%s), epoch: %s, source: %s",
num, self.platforms[num], epoch, source)
self.updated = True
except sqlite3.IntegrityError:
pass
def write_tle_txt(self):
"""Write TLE data to a text file."""
if not self.updated and not self.writer_config.get('write_always',
False):
return
pattern = os.path.join(self.writer_config["output_dir"],
self.writer_config["filename_pattern"])
now = dt.datetime.utcnow()
fname = now.strftime(pattern)
out_dir = os.path.dirname(fname)
if not os.path.exists(out_dir):
os.makedirs(out_dir)
logging.info("Created directory %s", out_dir)
data = []
for satid, platform_name in self.platforms.items():
if self.writer_config.get("write_name", False):
data.append(platform_name)
query = ("SELECT epoch, tle FROM '%s' ORDER BY "
"epoch DESC LIMIT 1" % satid)
epoch, tle = self.db.execute(query).fetchone()
date_epoch = dt.datetime.strptime(epoch, ISO_TIME_FORMAT)
tle_age = (
dt.datetime.utcnow() - date_epoch).total_seconds() / 3600.
logging.info("Latest TLE for '%s' (%s) is %d hours old.",
satid, platform_name, int(tle_age))
data.append(tle)
with open(fname, 'w') as fid:
fid.write('\n'.join(data))
logging.info("Wrote %d TLEs to %s", len(data), fname)
def close(self):
"""Close the database."""
self.db.close()
def table_exists(db, name):
"""Check if the table 'name' exists in the database."""
name = str(name)
query = "SELECT 1 FROM sqlite_master WHERE type='table' and name=?"
return db.execute(query, (name,)).fetchone() is not None
def main():
"""Run a test TLE reading."""
tle_data = read('Noaa-19')
print(tle_data)
if __name__ == '__main__':
main()