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Data Radio Channel (DARC)
Implementation for python and gnuradio, following ETSI EN 300 751 v1.2.1
Contents
./docs/
Documentation about the MVG Layer 6 Protocol, gained from reverse engineering
./src/gr-darc/
Gnuradio implementation of Layer 1 and Layer 2
./src/py/
Python implementation of Layer 2-5
Operation
There are several possibilities to use the DARC implementation:
Offline
Receive and demodulate the DARC signal and dump the bitstream to a file, then open it using
python darc_prototype.py <filename>
Online
You can find the Gnurado Flowgraph here:
src/gr-darc/apps/darc_rx.grc
Receive and demodulate the DARC signal and process it using the DARC Layer2 block. Use the UDP sink to provide the Layer 2 data on the network. Process the other layers using
python darc_udp.py
Installation of the gr-darc out of tree module
Info Used GnuRadio-Version: 3.7.5.1
In the gr-darc folder:
mkdir build
cd build
cmake ..
sudo make install
sudo ldconfig
Station IDs in Munich
| ID | ID (Hex) | Stop | Direction/Destination |
|---|---|---|---|
| 1509 | 0x05E5 | Schluesselbergstr | Tram 19 -> Pasing |
| 1510 | 0x05E6 | Schluesselbergstr | Tram 19 -> StVeitstr |
| 1549 | 0x060D | Grillparzer | Bus 187 -> Ruemelinstr |
| 1625 | 0x0659 | Adunistr | Bus 53 -> Aidenbachstr |
| 1626 | 0x065A | Adunistr | Bus 53 -> Muenchner Freiheit |
| 1642 | 0x066A | Lehel | Tram 18 -> Gondrellplatz |
| 1701 | 0x06A5 | Einsteinstr | Bus 144 -> Ackermannbogen |
| 1761 | 0x06E1 | Sendlinger Tor | Bus 62 -> Ostbahnhof |
| 1775 | 0x06EF | Waltherstr | Bus 62 -> Rotkreuzplatz |
| 1800 | 0x0708 | Mariannenplatz | Gondrellplatz |
| 1814 | 0x0716 | Maxmonument | Tram 19 -> StVeitstr |
| 1818 | 0x071A | Maxmonument | Tram 19 -> Pasing |
| 1840 | 0x0730 | Mariannenplatz | Effnerplatz |
| 1923 | 0x0783 | Waltherstr | Bus 62 -> Ostbahnhof |
| 1927 | 0x0787 | Isator/Zweibrueckenstr | Bus 132 -> Forstenrieder Park |
Ressources
Official
-
https://www.axentia.se/en/products/ibus-displays/battery-operated
-
http://www.etsi.org/deliver/etsi_en/300700_300799/300751/01.02.01_60/en_300751v010201p.pdf
Projects
-
http://www.windytan.com/2013/11/broadcast-messages-on-darc-side.html
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https://apollo.open-resource.org/mission:log:2014:08:08:darc-side-of-munich-hunting-fm-broadcasts-for-bus-and-tram-display-information-on-90-mhz
-
http://www.tramgeschichten.de/2009/09/19/auf-der-spur-des-geheimen-dfi-datensignals/
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