Hi all
for a research project I'm trying to record and replay few seconds of GPS
signal. The recording part has been done correctly, a 40 seconds GPS
acquisition has been tested against a GPS-SDR receiver obtaining a correct
position fix. Now I'd like to transmit the recorded signal through RF cable and
see if a commercial GPS receiver is able to get the position fix as well. The
problem is that, as soon as I start the simple flow graph in GNU radio I get
the "U" underrun warning (side note: PC became un-responding too) and it seems
I'm not transmitting at all.
Here's the complete description of the problem:
Front-end: USRP N210 with WBX
Recorded file:
data type: complex float32
centre freq: GPS L1
sampling rate: 10 MHz
acquisition length: 40 seconds
recorded file size: 3.2 GB
Host PC:
OS: Windows 10 Pro (64bit)
CPU: Intel Core i7-7820HQ
RAM: 32 GB
HD: Toshiba THNSNK512GCS8 (545 MB/s write speed)
network adapter: gigabit capable
USRP Sink configuration:
sampling rate: 10 MHz
input type: complex float32
wire format: automatic
centre freq: GPS L1
Ch0:Antenna TX/RX
(everything else as default)
>From the numbers I wouldn't say that the bottleneck is the HD (in any case
>I've already tried loading the recorded file from a RAMdisk with the same
>problems...) or the network speed.
Any idea on what I'm doing wrong and how to get rid of the underrun warning?
Thanks in advance
Fabrizio
--------------------------------------------------------------------------------------
The information contained in this e-mail is intended only for the
individual or entity to whom it is addressed. Its contents (including
any attachments) are confidential and privileged: if you are not an
intended recipient you must not use, disclose, disseminate, copy or
print its contents. If you have received this email by mistake please
notify us by emailing the sender, and then delete and/or destroy the
e-mail and any copies from your system
--------------------------------------------------------------------------------------
_______________________________________________
USRP-users mailing list
USRP-users@lists.ettus.com
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
