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 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 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 version 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 version 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 version 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 version 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