26 Aug
2013
26 Aug
'13
4:56 a.m.
Hi,
Yes, you are right. The thought is kind of message combination or
information fusion, diversity receiving. In this situation, large distance
spaced antennas/dongles are required to get enough diversity.
But in some application, such as beam forming, direction finding, we want
to have antennas/dongles located in a strict relation ship, such as
lambda/2 spaced antenna array. In this case we want to detect carrier
phases of each channels.
On Mon, Aug 26, 2013 at 12:11 AM, Skip Tavakkolian <
skip.tavakkolian(a)gmail.com> wrote:
if you are trying to process ADS-B from two different
dongles, running two
dump1090's isn't a problem. i routinely run dump1090 and rtl_acars using
two dongles on the same machine simultaneously. when running two dump1090
process you must provide the device id for each and make sure both aren't
running their web servers on the same port.
a more useful setup is to have multiple receivers running on cheap servers
(e.g. raspberry pi) at different locations and then collecting and
correlating the data. having receivers at different locations should yield
a larger coverage area.
On Sun, Aug 25, 2013 at 7:13 AM, Jiao Xianjun <putaoshu(a)gmail.com> wrote:
basically you are right.
But there is signal processing algorithm to track two dongles
sampling/oscillator error separately and compensate them separately. Thus
we can get them synchronized finally after signal processing algorithm.
What I need actually is that how to get two streams of sample from two
dongles.
Actually I notice that in dump1090 it put rtlsdr_read_async in a new
created background thread, then there is a possibility that I create two
thread to operate two dongles. But in this method, there should be some
mechanisms to synchronize two threads. It is complicated.
Anyone has simpler solution?
Thank you.
On Sun, Aug 25, 2013 at 9:49 PM, Thierry Leconte <
thierry.leconte(a)laposte.net> wrote:
Le 25/08/2013 15:13, Jiao Xianjun a écrit :
Hi,
I want to use multiple rtl-sdr dongles to do some multi-antenna
experiments.
Is it possible to read IQ samples from multiple rtl-sdr dongles in a
synchronized manner?
Each dongle have its own clock, so it will never be synchronized at
the sample
level.