I discovered GNU Radio few months ago, in a before-go-to-bed surfing. I
found it very interesting, but complicated because of my poor skills in
programming Python or C++. I’m doing research on Global Navigation
Systems (GNSS) receivers, and I’m used to code everything in Matlab.
after night, I’ve been browsing the documentation and making humble
installed Ubuntu on my laptop, followed the -excellent, also for dummies
like me- guide for installing all the software, read diagonally the
documentation and played with sample codes. Some Hello Worlds, some
with the audio module, getting used to read the mailing list, feeling
astonished by the intense activity of this community… nothing new, I
Now I want to take it more seriously. I’ve seen that both python and c++
have very well done matrix algebra libraries, and that’s exactly what I
for my research (you can call me naive). I would like to implement a
receiver (in the wide sense) based on an antenna array and play with
beamforming algorithms and weird RF front-end architectures (direct RF,
sampling, etc). My main concern is synchronization, concretely I want to
implement some signal processing algorithms in a real receiver in order
assess their impact in the whole system, testing them with real data.
been working in the development of some algorithms that -theoretically-
performs better in multipath environments, but I want to see if this is
beyond classical academic benchmarks.
What is the state of GNSS receivers development in GNU Radio? I have
some expressions of interest in the Internet, but nothing concrete. I’m
willing to start it from the scratch, but it is nonsense to reinvent the
wheel. I would like to put in contact with other people interested on
topics. Taking advantage of your patience, I have some other questions
you will see my newbie approach):
I’ve seen some statements about “beamforming is possible”. To what
I’m trying to understand the multi-antenna code example, but it is
to use the four ADC at the same time? How well are they synchronized? it
possible to compute the weight values in software and perform the
multiplication in the FPGA at real time? There is any other major
than algebraic weight computation time?
My first target is a “traditional” L1 C/A code GPS receiver. I guess
I can choose between RFX1200 and a BasicRx with an external front-end.
someone worked in the connection of GNU Radio with gpstk?
It is 32 MHz the maximum bandwidth available? Will the USRP 2.0
this bandwidth? It is possible to decrease the resolution of the ADCs
increase their sampling frequency?
I also would like to work on the Galileo signal structure and the new
GPS signal, mostly on the correlators. I have a background on signal
processing, but I’m strongly matlab-shaped in what about programming is
concerned. I’m willing to learn, but am I pointing to the right
If someone could enlighten me in some of this questions, it would be
appreciated. Sorry for the long text.