Inmarsat STD-C Decoder (b4000Hz by microp11)

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matthewn1983
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Joined: Sat Feb 06, 2010 9:41 am

Inmarsat STD-C Decoder (b4000Hz by microp11)

Post by matthewn1983 » Wed Mar 08, 2017 11:03 pm

source: http://www.rtl-sdr.com/b4000hz-new-std- ... t-decoder/

* Outernet L-Band Patch Antenna and RTL-SDR required *

A new STD-C Inmarsat decoder called b4000Hz has recently been uploaded over at CodePlex by microp11. The decoder is Windows based and simply listens to the demodulated Inmarsat STD-C audio from a program such as SDR#. This means that it is compatible with the RTL-SDR, and any other SDR that can receive Inmarsat.

We gave the software a brief test and it ran very well, and managed to decode several SafeteNET messages without issue, maintaining a good lock most of the time. microp11 writes that he plans to improve on the software in the future by creating a web service based version of the software.

Currently there are two other Inmarsat decoders available. One is called InmarsatDecoder and the other is the Tekmanoid decoder. The InmarsatDecoder is generally regarded as the best, but the Tekmanoid decoder was recently updated for improved performance.

Inmarsat STD-C messages are broadcast from geostationary satellites in the L-band at around 1.5 Ghz. They send mostly marine based messages such as the following quoted from the b4000Hz website:

Safety: high seas, tropical storm warnings, ice accretion…
Shipping activity: moving oil rigs, submarine cable deployment and repairs…
Distress reports: MOB, ships lost at sea, migrant ship reports…
Military exercises (firing practice, no fly zones…)
Pirate at sea reports…


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