Note that the N310's FPGA might actually be large enough to fit in (parts of) a GNSS
receiver, especially if you remove the DUC chain of the TX path, in case you don't need
that. RFNoC is Ettus' framework for extending the FPGA functionality, especially made for
such use cases.
Note that even in RFNoC you get a stream of samples from the radio frontend, which you
basically paid NI/Ettus for to design it for you, so that you don't have to worry about
how to talk to the physical hardware and can care about signal processing :)
Cheers,
Marcus
On 03.01.23 16:11, Marcus Müller wrote:
Hi Mr Pereira,
the directest access you get to samples in the N210 is the ethernet connection – and
that has no downside for GNSS applications, as the VITA49 samples fully represent the RF
signal, thanks to Shannon-Nyquist.
That is, of course, unless you start modifying the FPGA image of the N210, and make it a
completely different product. It's kind of unlikely you want to do that.
Greetings,
Marcus
On 03.01.23 14:25, Pedro Pereira wrote:
Greetings,
I have 2 USRP front-ends - N210 and N310. I want to develop a GNSS Receiver inside my
FGPA - xilinx ZCU102 - and use one of the USRP devices only as the front-end. The
receiver is quite large so I need an external board for all the signal processing
chain. The receiver has two implementations - software-only & hybrid. In hybrid mode
some tasks of the processing chain are accelerated in hardware.
The software-only version of the receiver running on my ZCU102 is able to configure the
N210 and read packets over ethernet correctly. However, with the hybrid version of the
receiver, I want to read the digital IQ samples from the front end directly in hardware.
For example, I am able to do this with the ZCU102 connected to FMComm2/3 using the FMC
connection on the FPGA. AD provides HDL reference designs to support communication
between multiple front-ends and multiple FPGAs.
Is there a similar way to read the digital samples directly in hardware using the N210?
The N210 only has the ethernet and a MIMO port.
Thanks in advance.
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