Hi folks,
I’d like to share the following four releases with the community:
-
This video: http://youtu.be/ZuRcaxpbYCw
which serves as an introduction to receiving HF with SDR (in this case a
USRP+WBX+transverter http://spench.net/drupal/resources/usrp-hf ). I
explore some interesting/unusual signals (e.g. OTH RADAR, STANAG,
OFDM/DRM
http://wiki.spench.net/wiki/OFDM ) and analyse them using GNU Radio
(e.g.
Fast Auto-correlation
http://wiki.spench.net/wiki/Fast_Auto-correlation ,
Cyclostationary analysis http://wiki.spench.net/wiki/gr-baz#delay ,
MPSK
demodulation), HDSDR and Sigmira. There are a few unknown signals in
there
too, so if you have any idea what they might be please comment on the
YouTube page!
-
A new release of ExtIO_USRP+FUNcube Dongle plugin
http://wiki.spench.net/wiki/USRP_Interfaces for Winrad/HDSDR/WRplus,
and
BorIP server http://wiki.spench.net/wiki/BorIP (version 1.1.1).
This uses UHD 003.003.001 so most/all models of USRP should be supported
(not that you’d really need to use this with the LAN-accessible models -
it’s more for the USB ones, so you can receive samples from them
remotely).
There is also improved support for the FUNcube Dongle, and some other
minor
fixes.
-
Public release of gr-baz <http://wiki.spench.net/wiki/gr-baz>
that
contains several new blocks (many of which I’ve used for blind signal
analysis and un-FEC https://www.youtube.com/watch?v=Vn-dpUegUDQ 'ing):
. BorIP: fully functional & seamlessly-integrating client for
GNU
Radio (use all your existing flowgraphs with a remotely connected USRP).
. AutoFEC: automatically try every combination of Forward Error
Correction parameters when demodulating a complex symbol stream until
the
right one is chosen (i.e. a ‘lock’ is acquired).
. Eye: GRC GUI eye diagram
. Fast Auto-correlation Sink: GRC GUI graph
. Variable Delay: change delay at runtime
. Power: raise signal to a power and optionally divide by
another
power of 10
. Print Char: output bytes (as hex) to console, or optionally a
file, with squelch control and output limiting
. Puncture/De-puncture: allows for perforated convolutional
Forward
Error Correction (change rate of mother code & insert erasures)
. Swap: swap pairs of samples
. Unpacked-to-packed: byte-to-byte version (take bits from
incoming
byte stream and repack certain # of bits into output byte stream)
Plus more! Grab it with SVN http://svn.spench.net/main/gr-baz/ or
fork it
on github https://github.com/balint256/gr-baz .
-
Patches to GNU Radio
http://wiki.spench.net/wiki/GNU_Radio_Patches that improve
functionality
of certain blocks (e.g. enable parameters to be changed at runtime that
were
otherwise fixed at design time):
. GRC support for http://wiki.spench.net/wiki/GRC_Any_Blocks
‘Any’ Blocks: use any GR block without having to create a custom GRC XML
block definition for it (just type in raw Python into the Any block)
. Constellation sink: runtime adjustment of symbol rate (so you
can
experiment with changing symbol rate until symbols become sufficiently
separated on plot)
. Add Error Out output to gr_clock_recovery_mm_cc (graph it as a
real-time measure of how it’s performing)
. Add path metric from Viterbi as output to
gr_decode_ccsds_27_fb as
a measure of BER
. Debug outputs of internal state of gr_mpsk_receiver_cc to
allow
for graphing of its performance (e.g. how well it maintains sync, great
for
evaluating quality of reception with signals of varying SNR)
. Add BorIP packet decoding support to gr_udp_source (this is
necessary for the gr-baz BorIP client to work!)
. Enable reference vector to be changed at runtime for
gr_vector_source_X
. Enable gr_wavfile to open WAV files with the ‘auxi’ RIFF chunk
(e.g. those created by HDSDR)
. Make the gr_rational_resampler reconfigurable at runtime (i.e.
change interp/decim values while the flowgraph is running, great for
live
experimentation with different resampling rates when trying to find
correct
symbol rate)
. Alter audio passband, stopband and gain at runtime in
blks2impl/am_demod
. Add (experimental) fixes to gr_agc_cc so it doesn’t output
NaNs
when the input signal varies over an enormous range
. Addition of seamless BorIP integration to gr-usrp so it is
automatically imported (all flowgraphs will ‘just work’ with a remote
USRP
after setting default server address in ~/.gnuradio/config.conf)
And more! Also accessible via SVN and github above (patches are inside
‘gr-baz/patch’).
Certain bits still need some work, but I thought I’d finally better put
it
out there as perhaps others might like to contribute and take it
further.
I hope there’s at least one item above that you will find useful! Let me
know how you go.
Kind regards,
Balint @spenchdotnet http://twitter.com/spenchdotnet