The Python Mode-S Decoder
=========================

Python library for Mode-S message decoding. Support Downlink Formats (DF) are:

-  Automatic Dependent Surveillance - Broadcast (ADS-B) (DF17)

   -  aircraft information that contains: ICAO address, position, altitude, velocity (ground speed), callsign, etc.

-  Mode-S Elementary Surveillance (ELS) (DF4 and DF5).

   - DF4: Altitude
   - DF5: Squawk code

-  Mode-S Enhanced Surveillance (EHS) (DF20 and DF21). Additional information in response to SSR interrogation, such as: true airspeed, indicated airspeed, mach number, wind, temperature, etc.

   - DF20: Altitude
   - DF21: Squawk code
   - BDS 2,0   Aircraft identification
   - BDS 2,1   Aircraft and airline registration markings
   - BDS 4,0   Selected vertical intention
   - BDS 4,4   Meteorological routine air report
   - BDS 5,0   Track and turn report
   - BDS 5,3   Air-referenced state vector
   - BDS 6,0   Heading and speed report

Detailed manual on Mode-S decoding is published by the author, at:
http://adsb-decode-guide.readthedocs.io


Source code
-----------
Checkout and contribute to this open source project at:
https://github.com/junzis/pyModeS

API documentation at:
http://pymodes.readthedocs.io


Install
-------

The easiest installation is to use pip:

::

  pip install pyModeS


Use the library
---------------

.. code:: python

  import pyModeS as pms


Common functions:
*****************

.. code:: python

  pms.df(msg)                 # Downlink Format
  pms.crc(msg, encode=False)  # Perform CRC or generate parity bit

  pms.hex2bin(str)    # Convert hexadecimal string to binary string
  pms.bin2int(str)    # Convert binary string to integer
  pms.hex2int(str)    # Convert hexadecimal string to integer

  pms.gray2int(str)    # Convert grey code to interger


Core functions for ADS-B decoding:
**********************************

.. code:: python

  pms.adsb.icao(msg)
  pms.adsb.typecode(msg)

  # typecode 1-4
  pms.adsb.callsign(msg)

  # typecode 5-8 (surface) and 9-18 (airborne)
  pms.adsb.position(msg_even, msg_odd, t_even, t_odd, lat_ref=None, lon_ref=None)
  pms.adsb.airborne_position(msg_even, msg_odd, t_even, t_odd)
  pms.adsb.surface_position(msg_even, msg_odd, t_even, t_odd, lat_ref, lon_ref)

  pms.adsb.position_with_ref(msg, lat_ref, lon_ref)
  pms.adsb.airborne_position_with_ref(msg, lat_ref, lon_ref)
  pms.adsb.surface_position_with_ref(msg, lat_ref, lon_ref)

  pms.adsb.altitude(msg)

  # typecode: 19
  pms.adsb.velocity(msg)          # handles both surface & airborne messages
  pms.adsb.speed_heading(msg)     # handles both surface & airborne messages
  pms.adsb.surface_velocity(msg)
  pms.adsb.airborne_velocity(msg)


Note: When you have a fix position of the aircraft, it is convenient to
use `position_with_ref()` method to decode with only one position message
(either odd or even). This works with both airborne and surface position
messages. But the reference position shall be with in 180NM (airborne)
or 45NM (surface) of the true position.

Core functions for ELS decoding:
********************************

.. code:: python

  pms.els.icao(msg)       # ICAO address
  pms.els.df4alt(msg)     # Altitude from any DF4 message
  pms.ehs.df5id(msg)     # Squawk code from any DF5 message


Core functions for EHS decoding:
********************************

.. code:: python

  pms.ehs.icao(msg)       # ICAO address
  pms.ehs.df20alt(msg)    # Altitude from any DF20 message
  pms.ehs.df21id(msg)     # Squawk code from any DF21 message

  pms.ehs.BDS(msg)        # Comm-B Data Selector Version

  # for BDS version 2,0
  pms.ehs.isBDS20(msg)    # Check if message is BDS 2,0
  pms.ehs.callsign(msg)   # Aircraft callsign

  # for BDS version 4,0
  pms.ehs.isBDS40(msg)    # Check if message is BDS 4,0
  pms.ehs.alt40mcp(msg)   # MCP/FCU selected altitude (ft)
  pms.ehs.alt40fms(msg)   # FMS selected altitude (ft)
  pms.ehs.p40baro(msg)    # Barometric pressure (mb)

  # for BDS version 4,4
  pms.ehs.isBDS44(msg, rev=False) # Check if message is BDS 4,4
  pms.ehs.wind44(msg, rev=False)  # wind speed (kt) and heading (deg)
  pms.ehs.temp44(msg, rev=False)  # temperature (C)
  pms.ehs.p44(msg, rev=False)     # pressure (hPa)
  pms.ehs.hum44(msg, rev=False)   # humidity (%)

  # for BDS version 5,0
  pms.ehs.isBDS50(msg)    # Check if message is BDS 5,0
  pms.ehs.roll50(msg)     # roll angle (deg)
  pms.ehs.trk50(msg)      # track angle (deg)
  pms.ehs.gs50(msg)       # ground speed (kt)
  pms.ehs.rtrk50(msg)     # track angle rate (deg/sec)
  pms.ehs.tas50(msg)      # true airspeed (kt)

  # for BDS version 5,3
  pms.ehs.isBDS53(msg)    # Check if message is BDS 5,3
  pms.ehs.hdg53(msg)      # magnetic heading (deg)
  pms.ehs.ias53(msg)      # indicated airspeed (kt)
  pms.ehs.mach53(msg)     # MACH number
  pms.ehs.tas53(msg)      # true airspeed (kt)
  pms.ehs.vr53(msg)       # vertical rate (fpm)

  # for BDS version 6,0
  pms.ehs.isBDS60(msg)    # Check if message is BDS 6,0
  pms.ehs.hdg60(msg)      # heading (deg)
  pms.ehs.ias60(msg)      # indicated airspeed (kt)
  pms.ehs.mach60(msg)     # MACH number
  pms.ehs.vr60baro(msg)   # barometric altitude rate (ft/min)
  pms.ehs.vr60ins(msg)    # inertial vertical speed (ft/min)

Developement
------------
To perform unit tests. First install ``tox`` through pip, Then, run the following commands:

.. code:: bash

  $ tox