Resources ========= Links ----- About the satellites and the signals (GOES-R series): * HRIT/EMWIN: * https://www.goes-r.gov/users/hrit.html * https://www.goes-r.gov/hrit_emwin/ATR-2010-5482.pdf * GOES Rebroadcast (GRB): * https://www.goes-r.gov/users/grb.html * https://www.goes-r.gov/users/docs/GRB_downlink.pdf Because HRIT is similar to LRIT at a higher baud rate, documentation for LRIT is also relevant for HRIT. The documents below used to be hosted by NOAA until ~2020. They're mirrored here for posterity. * :download:`3_LRIT_Receiver-specs.pdf ` * :download:`4_LRIT_Transmitter-specs.pdf ` * :download:`5_LRIT_Mission-data.pdf ` The blog series by Lucas Teske is a great resource: * http://www.teske.net.br/lucas/2016/10/goes-satellite-hunt-part-1-antenna-system/ Notes ----- Reed-Solomon ^^^^^^^^^^^^ From the LRIT receiver specs: The LRIT dissemination service is a Grade-2 service; therefore, the transmission of user data will be error controlled using Reed-Solomon coding as an outer code. The used Reed-Solomon code is (255,223) with an interleaving of I = 4. Data must be transformed from Berlekamp's dual basis representation to conventional representation before we can run the Reed-Solomon algorithm provided by libcorrect. Refer to `CCSDS 101.0-B-6`_ (Recommendation For Space Data System Standards: Telemetry Channel Coding) to learn more about the Reed-Solomon specifics for this application, the dual basis representation, and how to transform data between conventional representation and dual basis representation. .. _`ccsds 101.0-b-6`: https://public.ccsds.org/Pubs/101x0b6s.pdf