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ukhasnet-decoder's Introduction

Decode UKHASnet packets with a RTL SDR dongle

This is a simple UKHASnet decoder for RTL SDR dongles. Other similar decoder might already exist but this was a way for me to understand the protocol and get used to it.

You need to have a working dongle and rtl_fm running.

Before starting

rtl_test

rtl_test -p 10 to get ppm error or use kalibrate but it did not work for me on OSX.

Get started

make

./UKHASnet-decoder -h

TODO (see code for details)

  • Synchronisation:
    • Add tolerance bit option (and possibly use the preamble for more robustness)
    • Support inverted bits
  • Confirm that RFM CRC computation is weird (has someone had some experience with that ?)
  • Find better threshold formula to account for packet with no sufficient bit transitions

ukhasnet-decoder's People

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ukhasnet-decoder's Issues

getopt assigns sample rate to the verbose option; -v -s 8000

getopt(argc, argv, "s:h:v:w") in main() should probably be getopt(argc, argv, "s:hvw") (only -s accepting an argument, as I understand it.)

"The options argument is a string that specifies the option characters that are valid for this program. An option character in this string can be followed by a colon (‘:’) to indicate that it takes a required argument. If an option character is followed by two colons (‘::’), its argument is optional; this is a GNU extension." - https://www.gnu.org/software/libc/manual/html_node/Using-Getopt.html

example; https://www.gnu.org/software/libc/manual/html_node/Example-of-Getopt.html

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