Ernest.
Sent from my BlackBerry 10 smartphone.
well, kind of
I think you're confusing different things:
* Hardware: Your HackRF has the job of tuning to a center frequency,
things like gain and giving you a lot of signal samples from there.
* Doppler Tracking: There's software that can calculate the doppler
a signal has that comes from a satellite as it passes over you
* libHackRF: This is the software to talk to your HackRF. It has the
job of setting parameters like gain and center frequency on the
HackRF, and get the samples from the HackRF
* GNU Radio: A software defined radio framework that let's you use
signal processing blocks. So far, we haven't talked about that at
all, so I kind of wonder why you're asking us :) Not that I mind,
but I think we should try to give this discussion to some
distinctive direction.
So, what is it that you need to do? Maybe if you could come up with
some sketch of what you want to achieve, it'll be easier to explain
what you need.
Best regards,
Marcus
On 01.04.2016 21:26, ERNEST MATEY
wrote:
Thank
you much Marcus,
I tried reading on internet about
libHackRf but no introductions.
However, from your comment, I suggest
it means I can connect HackRf to tracking software doppler
using LibHackRf!
Is that it?
Best Regards
Ernest.
Sent from my BlackBerry 10 smartphone.
From: Marcus Müller
Sent: Friday, April 1, 2016 7:49 PM
Subject: Re: [Discuss-gnuradio] DOPPLER
SHIFT
|
Dear Ernest,
Haven't used that, but hamlib is something completely different
than Gpredict; it's meant to control ham radio equipment, not to
predict doppler shift. If I can get that right from quickly
having a glimpse at hamlib, it seems like it was written for
hardware that connects to (or emulates a) sound card. The HackRF
isn't one of these, so you won't be able to interface it with
hamlib. Why would you, too? It's bandwidth is much greater, and
with gr-osmosdr, there's a very mature and well-maintained
interface to GNU Radio. You'll need libhackrf.
Generally, for frequencies you can receive with something like
the HackRF, a quick, rough estimate tells me that LEO satellites
(which probably are what you're concerned about) won't exhibit
much more than a couble kHz Doppler; you usually would not
re-tune the SDR frontend to correct that, but get a bandwidth
that's big enough to contain all your receive spectrum over its
full Doppler shift range.
Best regards,
Marcus
On 01.04.2016 20:25, ERNEST MATEY
wrote:
Hi Marcus and All
Thank you very much for your reply
Apart from Gpredict, which other way could I use
for doppler shifting for satellite tracking.
Please what do you say
about Hamlib?
Which other method can I
use to control HackRF frequency from satellite tracker on
GNUradio?
Best Regards
Ernest.
Sent from my BlackBerry 10 smartphone.
From: Marcus Müller
Sent: Friday, March 18, 2016 6:35 PM
Subject: Re: [Discuss-gnuradio] DOPPLER
SHIFT
|
Hi Ernest,
I saw your first mail, too, but I was really busy at that
time.
Now, what your error message indicates is that gpredict
wasn't properly installed. Not having used that myself, I
can't really be of much help, but you should first of all
check that if you run a python2 prompt, "import gpredict"
doesn't fail with the same error.
Best regards,
Marcus
On 03/18/2016 12:43 PM, ERNEST
MATEY wrote:
Hi All,
I am trying to track Satellite for CW signal
receiving and analysis on my GNURadio.
I know I need some tracking with Doppler shift.
What is the best way to do this?
Now, I have GPredict installed hoping to use
it.
I have added the GPredict doppler block to my
GRC library blocks and added the block to my flow
graph hoping to get Doppler shift from my engaged
GPredict
I have set my Ports correctly but I have an
error.
ImportError: No module named gpredict.
What can I do?
I also learnt I can control my receiver (
Hackrf) frequency directly from Gpredict using
Hamlib. Will this work?
I tried to install Hamlib but installation says
will delete some GRC files before Hamlib will work. I
don't want to temper with my healthy running GRC
What can I do for my Doppler Shift?
I am on Ubuntu 14 and I am very new to these
thing
Thank you for sharing your expertise.
God Bless you!
Sent from my BlackBerry 10 smartphone.
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