pyModeS/README.rst

The Python Mode-S Decoder (dev-2.0 branch)
==========================================

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 Comm-B replies - 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 3,0   ACAS active resolution advisory
   - 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


New features in v2.0
---------------------
- New structure of the libraries
- ADS-B and EHS data streaming
- Active aircraft viewing (in terminal)
- More advanced BDS identification in Enhanced Mode-S
- Optimize decoding speed


Source code
-----------
Checkout and contribute to this open source project at:
https://github.com/junzis/pyModeS/tree/dev-2.0

API documentation at:
http://pymodes.readthedocs.io
[To be updated]


Install
-------

To install latest development version (dev-2.0) from the GitHub:

::

  pip install git+https://github.com/junzis/pyModeS@dev-2.0


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

.. code:: python

  import pyModeS as pms


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

.. code:: python

  pms.df(msg)                 # Downlink Format
  pms.icao(msg)               # Infer the ICAO address from the message
  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), 9-18 (airborne, barometric height), and 9-18 (airborne, GNSS height)
  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.


Common Mode-S functions
************************

.. code:: python

  pms.icao(msg)           # Infer the ICAO address from the message
  pms.bds.infer(msg)      # Infer the Modes-S BDS code

  pms.bds.is10(msg)       # check if BDS is 1,0 explicitly
  pms.bds.is17(msg)       # check if BDS is 1,7 explicitly
  pms.bds.is20(msg)       # check if BDS is 2,0 explicitly
  pms.bds.is30(msg)       # check if BDS is 3,0 explicitly
  pms.bds.is40(msg)       # check if BDS is 4,0 explicitly
  pms.bds.is44(msg)       # check if BDS is 4,4 explicitly
  pms.bds.is50(msg)       # check if BDS is 5,0 explicitly
  pms.bds.is60(msg)       # check if BDS is 6,0 explicitly

  # check if BDS is 5,0 or 6,0, give reference spd, trk, alt (from ADS-B)
  pms.bds.is50or60(msg, spd_ref, trk_ref, alt_ref)


Mode-S elementary surveillance (ELS)
*************************************

.. code:: python

  pms.commb.ovc10(msg)      # overlay capability, BDS 1,0
  pms.commb.cap17(msg)      # GICB capability, BDS 1,7
  pms.commb.cs20(msg)       # callsign, BDS 2,0


Mode-S enhanced surveillance (EHS)
***********************************

.. code:: python

  # for BDS code 4,0
  pms.commb.alt40mcp(msg)   # MCP/FCU selected altitude (ft)
  pms.commb.alt40fms(msg)   # FMS selected altitude (ft)
  pms.commb.p40baro(msg)    # Barometric pressure (mb)

  # for BDS code 5,0
  pms.commb.roll50(msg)     # roll angle (deg)
  pms.commb.trk50(msg)      # track angle (deg)
  pms.commb.gs50(msg)       # ground speed (kt)
  pms.commb.rtrk50(msg)     # track angle rate (deg/sec)
  pms.commb.tas50(msg)      # true airspeed (kt)

  # for BDS code 6,0
  pms.commb.hdg60(msg)      # heading (deg)
  pms.commb.ias60(msg)      # indicated airspeed (kt)
  pms.commb.mach60(msg)     # MACH number
  pms.commb.vr60baro(msg)   # barometric altitude rate (ft/min)
  pms.commb.vr60ins(msg)    # inertial vertical speed (ft/min)


Meteorological routine air report (MRAR) [Experimental]
*******************************************************

.. code:: python

  # for BDS code 4,4
  pms.commb.wind44(msg, rev=False)  # wind speed (kt) and heading (deg)
  pms.commb.temp44(msg, rev=False)  # temperature (C)
  pms.commb.p44(msg, rev=False)     # pressure (hPa)
  pms.commb.hum44(msg, rev=False)   # humidity (%)

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

.. code:: bash

  $ tox