kopia lustrzana https://github.com/projecthorus/radiosonde_auto_rx
609 wiersze
25 KiB
Python
609 wiersze
25 KiB
Python
#!/usr/bin/env python
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#
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# radiosonde_auto_rx - Sonde Decoder Class.
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#
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# Copyright (C) 2018 Mark Jessop <vk5qi@rfhead.net>
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# Released under GNU GPL v3 or later
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#
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import logging
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import json
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import os
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import signal
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import subprocess
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import time
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import traceback
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from dateutil.parser import parse
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from threading import Thread
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from types import FunctionType, MethodType
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from .utils import AsynchronousFileReader, rtlsdr_test
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from .gps import get_ephemeris, get_almanac
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from .sonde_specific import *
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# Global valid sonde types list.
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VALID_SONDE_TYPES = ['RS92', 'RS41', 'DFM', 'M10', 'iMet']
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class SondeDecoder(object):
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'''
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Radiosonde Sonde Decoder class. Run a radiosonde decoder program as a subprocess, and pass the output onto exporters.
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Notes:
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The sonde decoder binary needs to output telemetry data as a valid JSON, with one frame of telemetry per line.
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Example:
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{ "frame": 1909, "id": "N3710309", "datetime": "2018-05-12T11:32:20.000Z", "lat": -34.90842, "lon": 138.49243, "alt": 3896.43871, "vel_h": 8.60708, "heading": 342.43237, "vel_v": 6.83107 }
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Required Fields are:
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"frame" (int): Frame counter. Usually provided by the radiosonde, and increments per telemetry frame.
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"id" (str): Unique identifier for the radiosonde, usually some kind of serial number.
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"datetime" (str): UTC Date/Time string, which indicates the time applicable to the telemetry sentence.
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Must be parseable with dateutil.
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"lat" (float): Radiosonde Latitude (decmial degrees)
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"lon" (float): Radiosonde Longitude (decimal degrees)
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"alt" (float): Radiosonde Altitude (metres)
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Optional Fields:
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These fields will be set to dummy values if they are not provided within the JSON blob.
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"temp" (float): Atmospheric temperature reported by the Radiosonde (degrees Celsius)
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"humidity" (float): Humidity value, reported by the radiosonde (%)
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"vel_h" (float): Horizontal Velocity (metres/s)
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"vel_v" (float): Vertical Velocity (metres/s)
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"heading" (float): Heading of the movement of the payload (degrees true)
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The following fields are added to the dictionary:
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"type" (str): Radiosonde type
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"freq_float" (float): Radiosonde frequency in MHz, as a float.
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"freq" (str): Radiosonde frequency as a string (XXX.XXX MHz).
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"datetime_dt" (datetime): Telemetry sentence time, as a datetime object.
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'''
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DECODER_REQUIRED_FIELDS = ['frame', 'id', 'datetime', 'lat', 'lon', 'alt']
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DECODER_OPTIONAL_FIELDS = {
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'temp' : -273.0,
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'humidity' : -1,
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'batt' : -1,
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'vel_h' : 0.0,
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'vel_v' : 0.0,
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'heading' : 0.0
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}
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VALID_SONDE_TYPES = ['RS92', 'RS41', 'DFM', 'M10', 'iMet']
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def __init__(self,
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sonde_type="None",
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sonde_freq=400000000.0,
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rs_path = "./",
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sdr_fm = "rtl_fm",
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device_idx = 0,
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ppm = 0,
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gain = -1,
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bias = False,
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save_decode_audio = False,
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save_decode_iq = False,
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exporter = None,
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timeout = 180,
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telem_filter = None,
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rs92_ephemeris = None,
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imet_location = ""):
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""" Initialise and start a Sonde Decoder.
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Args:
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sonde_type (str): The radiosonde type, as returned by SondeScanner. Valid types listed in VALID_SONDE_TYPES
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sonde_freq (int/float): The radiosonde frequency, in Hz.
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rs_path (str): Path to the RS binaries (i.e rs_detect). Defaults to ./
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sdr_fm (str): Path to rtl_fm, or drop-in equivalent. Defaults to 'rtl_fm'
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device_idx (int or str): Device index or serial number of the RTLSDR. Defaults to 0 (the first SDR found).
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ppm (int): SDR Frequency accuracy correction, in ppm.
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gain (int): SDR Gain setting, in dB. A gain setting of -1 enables the RTLSDR AGC.
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bias (bool): If True, enable the bias tee on the SDR.
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save_decode_audio (bool): If True, save the FM-demodulated audio to disk to decode_<device_idx>.wav.
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Note: This may use up a lot of disk space!
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save_decode_iq (bool): If True, save the decimated IQ stream (48 or 96k complex s16 samples) to disk to decode_IQ_<device_idx>.bin
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Note: This will use up a lot of disk space!
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exporter (function, list): Either a function, or a list of functions, which accept a single dictionary. Fields described above.
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timeout (int): Timeout after X seconds of no valid data received from the decoder. Defaults to 180.
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telem_filter (function): An optional filter function, which determines if a telemetry frame is valid.
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This can be used to allow the decoder to timeout based on telemetry contents (i.e. no lock, too far away, etc),
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not just lack-of-telemetry. This function is passed the telemetry dict, and must return a boolean based on the telemetry validity.
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rs92_ephemeris (str): OPTIONAL - A fixed ephemeris file to use if decoding a RS92. If not supplied, one will be downloaded.
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imet_location (str): OPTIONAL - A location field which is use in the generation of iMet unique ID.
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"""
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# Thread running flag
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self.decoder_running = True
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# Local copy of init arguments
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self.sonde_type = sonde_type
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self.sonde_freq = sonde_freq
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self.rs_path = rs_path
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self.sdr_fm = sdr_fm
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self.device_idx = device_idx
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self.ppm = ppm
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self.gain = gain
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self.bias = bias
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self.save_decode_audio = save_decode_audio
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self.save_decode_iq = save_decode_iq
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self.telem_filter = telem_filter
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self.timeout = timeout
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self.rs92_ephemeris = rs92_ephemeris
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self.imet_location = imet_location
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# iMet ID store. We latch in the first iMet ID we calculate, to avoid issues with iMet-1-RS units
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# which don't necessarily have a consistent packet count to time increment ratio.
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# This is a tradeoff between being able to handle multiple iMet sondes on a single frequency, and
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# not flooding the various databases with sonde IDs in the case of a bad sonde.
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self.imet_id = None
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# This will become our decoder thread.
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self.decoder = None
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self.exit_state = "OK"
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# Detect if we have an 'inverted' sonde.
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if self.sonde_type.startswith('-'):
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self.inverted = True
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# Strip off the leading '-' character'
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self.sonde_type = self.sonde_type[1:]
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else:
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self.inverted = False
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# Check if the sonde type is valid.
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if self.sonde_type not in self.VALID_SONDE_TYPES:
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self.log_error("Unsupported sonde type: %s" % self.sonde_type)
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self.decoder_running = False
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return
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# Test if the supplied RTLSDR is working.
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_rtlsdr_ok = rtlsdr_test(device_idx)
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# TODO: How should this error be handled?
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if not _rtlsdr_ok:
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self.log_error("RTLSDR #%s non-functional - exiting." % device_idx)
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self.decoder_running = False
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return
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# We can accept a few different types in the exporter argument..
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# Nothing...
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if exporter == None:
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self.exporters = None
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# A single function...
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elif type(exporter) == FunctionType:
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self.exporters = [exporter]
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# A list of functions...
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elif type(exporter) == list:
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# Check everything in the list is a function
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for _func in exporter:
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if (type(_func) is not FunctionType) and (type(_func) is not MethodType):
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raise TypeError("Supplied exporter list does not contain functions.")
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# If it all checks out, use the supplied list.
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self.exporters = exporter
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else:
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# Otherwise, bomb out.
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raise TypeError("Supplied exporter has incorrect type.")
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# Generate the decoder command.
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self.decoder_command = self.generate_decoder_command()
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if self.decoder_command is None:
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self.log_error("Could not generate decoder command. Not starting decoder.")
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self.decoder_running = False
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else:
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# Start up the decoder thread.
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self.decode_process = None
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self.async_reader = None
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self.decoder_running = True
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self.decoder = Thread(target=self.decoder_thread)
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self.decoder.start()
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def generate_decoder_command(self):
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""" Generate the shell command which runs the relevant radiosonde decoder.
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This is where support for new sonde types can be added.s
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Returns:
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str/None: The shell command which will be run in the decoder thread, or none if a valid decoder could not be found.
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"""
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# Common options to rtl_fm
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# Add a -T option if bias is enabled
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bias_option = "-T " if self.bias else ""
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# Add a gain parameter if we have been provided one.
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if self.gain != -1:
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gain_param = '-g %.1f ' % self.gain
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else:
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gain_param = ''
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if self.sonde_type == "RS41":
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# RS41 Decoder command.
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# rtl_fm -p 0 -g -1 -M fm -F9 -s 15k -f 405500000 | sox -t raw -r 15k -e s -b 16 -c 1 - -r 48000 -b 8 -t wav - lowpass 2600 2>/dev/null | ./rs41ecc --crc --ecc --ptu
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# Note: Have removed a 'highpass 20' filter from the sox line, will need to re-evaluate if adding that is useful in the future.
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decode_cmd = "%s %s-p %d -d %s %s-M fm -F9 -s 15k -f %d 2>/dev/null |" % (self.sdr_fm, bias_option, int(self.ppm), str(self.device_idx), gain_param, self.sonde_freq)
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decode_cmd += "sox -t raw -r 15k -e s -b 16 -c 1 - -r 48000 -b 8 -t wav - lowpass 2600 2>/dev/null |"
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# Add in tee command to save audio to disk if debugging is enabled.
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if self.save_decode_audio:
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decode_cmd += " tee decode_%s.wav |" % str(self.device_idx)
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decode_cmd += "./rs41mod --ptu --json 2>/dev/null"
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elif self.sonde_type == "RS92":
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# Decoding a RS92 requires either an ephemeris or an almanac file.
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# If we have been supplied an ephemeris file, we will attempt to use it, otherwise
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# we will try and download one.
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if self.rs92_ephemeris == None:
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# If no ephemeris data defined, attempt to download it.
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# get_ephemeris will either return the saved file name, or None.
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self.rs92_ephemeris = get_ephemeris(destination="ephemeris.dat")
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# If ephemeris is still None, then we failed to download the ephemeris data.
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# Try and grab the almanac data instead
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if self.rs92_ephemeris == None:
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self.log_error("Could not obtain ephemeris data, trying to download an almanac.")
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almanac = get_almanac(destination="almanac.txt")
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if almanac == None:
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# We probably don't have an internet connection. Bomb out, since we can't do much with the sonde telemetry without an almanac!
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self.log_error("Could not obtain GPS ephemeris or almanac data.")
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return None
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else:
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_rs92_gps_data = "-a almanac.txt --gpsepoch 2" # Note - This will need to be updated in... 19 years.
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else:
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_rs92_gps_data = "-e ephemeris.dat"
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else:
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_rs92_gps_data = "-e %s" % self.rs92_ephemeris
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# Adjust the receive bandwidth based on the band the scanning is occuring in.
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if self.sonde_freq < 1000e6:
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# 400-406 MHz sondes - use a 12 kHz FM demod bandwidth.
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_rx_bw = 12000
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else:
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# 1680 MHz sondes - use a 28 kHz FM demod bandwidth.
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# NOTE: This is a first-pass of this bandwidth, and may need to be optimized.
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_rx_bw = 28000
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# Now construct the decoder command.
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# rtl_fm -p 0 -g 26.0 -M fm -F9 -s 12k -f 400500000 | sox -t raw -r 12k -e s -b 16 -c 1 - -r 48000 -b 8 -t wav - highpass 20 lowpass 2500 2>/dev/null | ./rs92ecc -vx -v --crc --ecc --vel -e ephemeris.dat
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decode_cmd = "%s %s-p %d -d %s %s-M fm -F9 -s %d -f %d 2>/dev/null |" % (self.sdr_fm, bias_option, int(self.ppm), str(self.device_idx), gain_param, _rx_bw, self.sonde_freq)
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decode_cmd += "sox -t raw -r %d -e s -b 16 -c 1 - -r 48000 -b 8 -t wav - lowpass 2500 highpass 20 2>/dev/null |" % _rx_bw
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# Add in tee command to save audio to disk if debugging is enabled.
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if self.save_decode_audio:
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decode_cmd += " tee decode_%s.wav |" % str(self.device_idx)
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decode_cmd += "./rs92mod -vx -v --crc --ecc --vel --json %s 2>/dev/null" % _rs92_gps_data
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elif self.sonde_type == "DFM":
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# DFM06/DFM09 Sondes.
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# As of 2019-02-10, dfm09ecc auto-detects if the signal is inverted,
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# so we don't need to specify an invert flag.
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# 2019-02-27: Added the --dist flag, which should reduce bad positions a bit.
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# Note: Have removed a 'highpass 20' filter from the sox line, will need to re-evaluate if adding that is useful in the future.
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decode_cmd = "%s %s-p %d -d %s %s-M fm -F9 -s 15k -f %d 2>/dev/null |" % (self.sdr_fm, bias_option, int(self.ppm), str(self.device_idx), gain_param, self.sonde_freq)
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decode_cmd += "sox -t raw -r 15k -e s -b 16 -c 1 - -r 48000 -b 8 -t wav - highpass 20 lowpass 2000 2>/dev/null |"
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# Add in tee command to save audio to disk if debugging is enabled.
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if self.save_decode_audio:
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decode_cmd += " tee decode_%s.wav |" % str(self.device_idx)
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# DFM decoder
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decode_cmd += "./dfm09ecc -vv --ecc --json --dist --auto 2>/dev/null"
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elif self.sonde_type == "M10":
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# M10 Sondes
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decode_cmd = "%s %s-p %d -d %s %s-M fm -F9 -s 22k -f %d 2>/dev/null |" % (self.sdr_fm, bias_option, int(self.ppm), str(self.device_idx), gain_param, self.sonde_freq)
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decode_cmd += "sox -t raw -r 22k -e s -b 16 -c 1 - -r 48000 -b 8 -t wav - highpass 20 2>/dev/null |"
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# Add in tee command to save audio to disk if debugging is enabled.
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if self.save_decode_audio:
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decode_cmd += " tee decode_%s.wav |" % str(self.device_idx)
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# M10 decoder
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decode_cmd += "./m10 -b -b2 2>/dev/null"
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elif self.sonde_type == "iMet":
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# iMet-4 Sondes
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decode_cmd = "%s %s-p %d -d %s %s-M fm -F9 -s 15k -f %d 2>/dev/null |" % (self.sdr_fm, bias_option, int(self.ppm), str(self.device_idx), gain_param, self.sonde_freq)
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decode_cmd += "sox -t raw -r 15k -e s -b 16 -c 1 - -r 48000 -b 8 -t wav - highpass 20 2>/dev/null |"
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# Add in tee command to save audio to disk if debugging is enabled.
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if self.save_decode_audio:
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decode_cmd += " tee decode_%s.wav |" % str(self.device_idx)
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# iMet-4 (IMET1RS) decoder
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decode_cmd += "./imet1rs_dft --json 2>/dev/null"
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else:
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# Should never get here.
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return None
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return decode_cmd
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def decoder_thread(self):
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""" Runs the supplied decoder command as a subprocess, and passes returned lines to handle_decoder_line. """
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# Timeout Counter.
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_last_packet = time.time()
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self.log_debug("Decoder Command: %s" % self.decoder_command )
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# Start the thread.
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self.decode_process = subprocess.Popen(self.decoder_command, shell=True, stdin=None, stdout=subprocess.PIPE, preexec_fn=os.setsid)
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self.async_reader = AsynchronousFileReader(self.decode_process.stdout, autostart=True)
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self.log_info("Starting decoder subprocess.")
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while (not self.async_reader.eof()) and self.decoder_running:
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# Read in any lines available in the async reader queue.
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for _line in self.async_reader.readlines():
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if (_line != None) and (_line != ""):
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# Pass the line into the handler, and see if it is OK.
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_ok = self.handle_decoder_line(_line)
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# If we decoded a valid JSON blob, update our last-packet time.
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if _ok:
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_last_packet = time.time()
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# Check timeout counter.
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if time.time() > (_last_packet + self.timeout):
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# If we have not seen data for a while, break.
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self.log_error("RX Timed out.")
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self.exit_state = "Timeout"
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break
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else:
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# Otherwise, sleep for a short time.
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time.sleep(0.1)
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# Either our subprocess has exited, or the user has asked to close the process.
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#Try many things to kill off the subprocess.
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try:
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# Stop the async reader
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self.async_reader.stop()
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# Send a SIGKILL to the subprocess PID via OS.
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try:
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os.killpg(os.getpgid(self.decode_process.pid), signal.SIGKILL)
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except Exception as e:
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self.log_debug("SIGKILL via os.killpg failed. - %s" % str(e))
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time.sleep(1)
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try:
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# Send a SIGKILL via subprocess
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self.decode_process.kill()
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except Exception as e:
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self.log_debug("SIGKILL via subprocess.kill failed - %s" % str(e))
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# Finally, join the async reader.
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self.async_reader.join()
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except Exception as e:
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traceback.print_exc()
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self.log_error("Error while killing subprocess - %s" % str(e))
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self.log_info("Closed decoder subprocess.")
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self.decoder_running = False
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def handle_decoder_line(self, data):
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""" Handle a line of output from the decoder subprocess.
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Args:
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data (str, bytearray): One line of text output from the decoder subprocess.
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Returns:
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bool: True if the line was decoded to a JSON object correctly, False otherwise.
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"""
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# Don't even try and decode lines which don't start with a '{'
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# These may be other output from the decoder, which we shouldn't try to parse.
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# Catch 'bad' first characters.
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try:
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_first_char = data.decode('ascii')[0]
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except UnicodeDecodeError:
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return
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# Catch non-JSON object lines.
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if data.decode('ascii')[0] != '{':
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return
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else:
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try:
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_telemetry = json.loads(data.decode('ascii'))
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except Exception as e:
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self.log_debug("Line could not be parsed as JSON - %s" % str(e))
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return False
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# Check the JSON blob has been parsed as a dictionary
|
|
if type(_telemetry) is not dict:
|
|
self.log_error("Parsed JSON object is not a dictionary!")
|
|
return False
|
|
|
|
# Check that the required fields are in the telemetry blob
|
|
for _field in self.DECODER_REQUIRED_FIELDS:
|
|
if _field not in _telemetry:
|
|
self.log_error("JSON object missing required field %s" % _field)
|
|
return False
|
|
|
|
# Check for optional fields, and add them if necessary.
|
|
for _field in self.DECODER_OPTIONAL_FIELDS.keys():
|
|
if _field not in _telemetry:
|
|
_telemetry[_field] = self.DECODER_OPTIONAL_FIELDS[_field]
|
|
|
|
|
|
# Check for an encrypted flag (this indicates a sonde that we cannot decode telemetry from.)
|
|
if 'encrypted' in _telemetry:
|
|
self.log_error("Radiosonde %s has encrypted telemetry (possible RS41-SGM)! We cannot decode this, closing decoder." % _telemetry['id'])
|
|
self.exit_state = "Encrypted"
|
|
self.decoder_running = False
|
|
return False
|
|
|
|
# Check the datetime field is parseable.
|
|
try:
|
|
_telemetry['datetime_dt'] = parse(_telemetry['datetime'])
|
|
except Exception as e:
|
|
self.log_error("Invalid date/time in telemetry dict - %s (Sonde may not have GPS lock)" % str(e))
|
|
return False
|
|
|
|
# Add in the sonde frequency and type fields.
|
|
_telemetry['type'] = self.sonde_type
|
|
_telemetry['freq_float'] = self.sonde_freq/1e6
|
|
_telemetry['freq'] = "%.3f MHz" % (self.sonde_freq/1e6)
|
|
|
|
# Add in information about the SDR used.
|
|
_telemetry['sdr_device_idx'] = self.device_idx
|
|
|
|
# Check for an 'aux' field, this indicates that the sonde has an auxilliary payload,
|
|
# which is most likely an Ozone sensor. We append -Ozone to the sonde type field to indicate this.
|
|
if 'aux' in _telemetry:
|
|
_telemetry['type'] += "-Ozone"
|
|
|
|
|
|
# iMet Specific actions
|
|
if self.sonde_type == 'iMet':
|
|
# Check we have GPS lock.
|
|
if _telemetry['sats'] < 4:
|
|
# No GPS lock means an invalid time, which means we can't accurately calculate a unique ID.
|
|
self.log_error("iMet sonde has no GPS lock - discarding frame.")
|
|
return False
|
|
|
|
# Fix up the time.
|
|
_telemetry['datetime_dt'] = imet_fix_datetime(_telemetry['datetime'])
|
|
# Generate a unique ID based on the power-on time and frequency, as iMet sondes don't send one.
|
|
# Latch this ID and re-use it for the entire decode run.
|
|
if self.imet_id == None:
|
|
self.imet_id = imet_unique_id(_telemetry, custom=self.imet_location)
|
|
|
|
_telemetry['id'] = self.imet_id
|
|
_telemetry['station_code'] = self.imet_location
|
|
|
|
# If we have been provided a telemetry filter function, pass the telemetry data
|
|
# through the filter, and return the response
|
|
# By default, we will assume the telemetry is OK.
|
|
_telem_ok = True
|
|
if self.telem_filter is not None:
|
|
try:
|
|
_telem_ok = self.telem_filter(_telemetry)
|
|
except Exception as e:
|
|
self.log_error("Failed to run telemetry filter - %s" % str(e))
|
|
_telem_ok = True
|
|
|
|
|
|
# If the telemetry is OK, send to the exporter functions (if we have any).
|
|
if self.exporters is None:
|
|
return
|
|
else:
|
|
if _telem_ok:
|
|
for _exporter in self.exporters:
|
|
try:
|
|
_exporter(_telemetry)
|
|
except Exception as e:
|
|
self.log_error("Exporter Error %s" % str(e))
|
|
|
|
return _telem_ok
|
|
|
|
|
|
|
|
|
|
def log_debug(self, line):
|
|
""" Helper function to log a debug message with a descriptive heading.
|
|
Args:
|
|
line (str): Message to be logged.
|
|
"""
|
|
logging.debug("Decoder #%s %s %.3f - %s" % (str(self.device_idx), self.sonde_type, self.sonde_freq/1e6, line))
|
|
|
|
|
|
def log_info(self, line):
|
|
""" Helper function to log an informational message with a descriptive heading.
|
|
Args:
|
|
line (str): Message to be logged.
|
|
"""
|
|
logging.info("Decoder #%s %s %.3f - %s" % (str(self.device_idx), self.sonde_type, self.sonde_freq/1e6, line))
|
|
|
|
|
|
def log_error(self, line):
|
|
""" Helper function to log an error message with a descriptive heading.
|
|
Args:
|
|
line (str): Message to be logged.
|
|
"""
|
|
logging.error("Decoder #%s %s %.3f - %s" % (str(self.device_idx), self.sonde_type, self.sonde_freq/1e6, line))
|
|
|
|
|
|
def stop(self):
|
|
""" Kill the currently running decoder subprocess """
|
|
self.decoder_running = False
|
|
|
|
if self.decoder is not None:
|
|
self.decoder.join()
|
|
|
|
|
|
def running(self):
|
|
""" Check if the decoder subprocess is running.
|
|
|
|
Returns:
|
|
bool: True if the decoder subprocess is running.
|
|
"""
|
|
return self.decoder_running
|
|
|
|
|
|
if __name__ == "__main__":
|
|
# Test script.
|
|
from .logger import TelemetryLogger
|
|
from .habitat import HabitatUploader
|
|
|
|
logging.basicConfig(format='%(asctime)s %(levelname)s:%(message)s', level=logging.DEBUG)
|
|
# Make requests & urllib3 STFU
|
|
requests_log = logging.getLogger("requests")
|
|
requests_log.setLevel(logging.CRITICAL)
|
|
urllib3_log = logging.getLogger("urllib3")
|
|
urllib3_log.setLevel(logging.CRITICAL)
|
|
|
|
|
|
_log = TelemetryLogger(log_directory="./testlog/")
|
|
_habitat = HabitatUploader(user_callsign="VK5QI_AUTO_RX_DEV", inhibit=False)
|
|
|
|
try:
|
|
_decoder = SondeDecoder(sonde_freq = 401.5*1e6,
|
|
sonde_type = "RS41",
|
|
timeout = 50,
|
|
device_idx="00000002",
|
|
exporter=[_habitat.add, _log.add])
|
|
|
|
# _decoder2 = SondeDecoder(sonde_freq = 405.5*1e6,
|
|
# sonde_type = "RS41",
|
|
# timeout = 50,
|
|
# device_idx="00000001",
|
|
# exporter=[_habitat.add, _log.add])
|
|
|
|
while True:
|
|
time.sleep(5)
|
|
if not _decoder.running():
|
|
break
|
|
except KeyboardInterrupt:
|
|
_decoder.stop()
|
|
#_decoder2.stop()
|
|
except:
|
|
traceback.print_exc()
|
|
pass
|
|
|
|
_habitat.close()
|
|
_log.close()
|
|
|
|
|
|
|