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
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