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gr_satellites - gr-satellites is a GNU Radio command line decoder for the telemetry of Amateur satellites.


gr_satellites satellite [options]


gr-satellites is a GNU Radio out-of-tree module encompassing a collection of telemetry decoders that supports many different Amateur satellites. It supports most popular protocols, such as AX.25, the GOMspace NanoCom U482C and AX100 modems, an important part of the CCSDS stack, the AO-40 protocol used in the FUNcube satellites, and several ad-hoc protocols used in other satellites.

The gr_satellites command line tool can be used to decode frames from each of the supported satellites by using either real-time RF samples from an SDR or conventional radio, or a recording.


The satellite parameter can be specified using name, NORAD ID or path to YAML file. The set of available options will change depending on the satellite, so it is mandatory to specify a satellite even to print the full help.

The options shown below are for the satellite AO-73. Other satellites have slightly different options.

General options

-h, --help
show the help message and exit
show program's version number and exit
list supported satellites and exit

Input options

--wavfile WAVFILE
WAV input file
--rawfile RAWFILE
RAW input file (float32 or complex64)
--rawint16 RAWINT16
RAW input file (int16)
--audio [DEVICE]
Soundcard device input
Use UDP input
--kiss_in KISS_IN
KISS input file
--samp_rate SAMP_RATE
Sample rate (Hz)
--udp_ip UDP_IP
UDP input listen IP [default='::']
--udp_port UDP_PORT
UDP input listen port [default='7355']
Use IQ input
--input_gain INPUT_GAIN
Input gain (can be negative to invert signal) [default=1]
--start_time START_TIME
Recording start timestamp
Throttle recording input to 1x speed

Output options

--kiss_out KISS_OUT
KISS output file
Append to KISS output file
--kiss_server [PORT]
Enable KISS server [default port=8100]
--kiss_server_address KISS_SERVER_ADDRESS
KISS server bind address [default='']
--zmq_pub [ADDRESS]
Enable ZMQ PUB socket [default address=tcp://]
Hexdump instead of telemetry parse
--dump_path DUMP_PATH
Path to dump internal signals

Demodulation options

--f_offset F_OFFSET
Frequency offset (Hz) [default=1500 or 12000]
--rrc_alpha RRC_ALPHA
RRC roll-off (Hz) [default=0.35]
Disable FLL
--fll_bw FLL_BW
FLL bandwidth (Hz) [default=25]
--clk_bw CLK_BW
Clock recovery bandwidth (relative to baudrate) [default=0.06]
--clk_limit CLK_LIMIT
Clock recovery limit (relative to baudrate) [default=0.02]
--costas_bw COSTAS_BW
Costas loop bandwidth (Hz) [default=50]
--manchester_history MANCHESTER_HISTORY
Manchester recovery history (symbols) [default=32]

Deframing options

--syncword_threshold SYNCWORD_THRESHOLD
Syncword bit errors [default=8]
Verbose RS decoder

Data sink

--telemetry_output TELEMETRY_OUTPUT
Telemetry output file [default=stdout]


jy1sat_ssdv(1), smog_p_spectrum(1)
2020-09-28 gr-satellites