Hi there,
for those folks interested in GPS (and Galileo) signal processing with
USRP+DBSRX and GNU Radio related stuff, please take a look at the
publications available at http://gnss-sdr.org/documentation/publications
We use three VOLK-based correlators for GPS L1 and five for Galileo. An
Ruoyu,
Buying a commercial Iridium antenna is, I'm sure, an ideal solution for your
work.
If the antenna is entirely passive (i.e it has no LNA and filter built in) then
it will still pick up frequencies outside the band of interest.
And, though attenuation will increase as these environmental
On 09/06/2013 03:33 PM, Ian Buckley wrote:
Filters will all to some degree attenuate your signal of interest, but
by how much varies dramatically depending on the type and design of
the filter, it could be 0.5dB or 20dB, but the point is that it
attenuates potential interferers and noise by
Hi, All
I am working on a project which requires to receive signals from LEO
satellites like orbcomm and iridium.
I tried to use USRP N210 to collect the data, but I found the signal may be
too weak to be observed.
Stuffs I used:
1. USRP N210, DBSRX2 800-2400MHz
2. *Minicircuit* cable
Hi,
1. USRP N210, DBSRX2 800-2400MHz
2. Minicircuit cable amplifier, provides 37 dB gain at 15V/0.68A supply
input. To ensure signal is enough enhanced, I used two of them in recent
experiments.
3. Horn antenna with frequency range from 0.8 - 18 GHz. beamwidth 60 degree.
You probably want
Hi,
I would rate GPS as invisible, with normal receiver technology. They are
using a low bitrate, spreaded over a very large frequency range. The only
way to see something should be correlating and decoding the stuff.
I've actually seen it without de-spreading during a presentation
recently.
I've actually seen it without de-spreading during a presentation recently. Of
course it had been received with a 25 m dish or so :)
Yep, brute forced it should be possible :-) Not really the same like with UMTS
or LTE...
Ralph.
___
What is the difference between the receiver tech in something like a CSR
chip vs USRP?
On Wed, Sep 4, 2013 at 9:25 PM, Ralph A. Schmid, dk5ras ra...@schmid.xxxwrote:
I've actually seen it without de-spreading during a presentation
recently. Of
course it had been received with a 25 m dish
apparently someone else was at OHM ...
i had not seen the trick of squaring the GPS signal to get rid of the
phase modulation and hence the spread spectrum to only recover the doppler
shift elsewhere: looks like a great trick to validate the reception of a GPS
signal even below thermal noise
Hi,
apparently someone else was at OHM ...
Yes :)
i had not seen the trick of squaring the GPS signal to get rid of the
phase modulation and hence the spread spectrum to only recover the doppler
shift elsewhere: looks like a great trick to validate the reception of a GPS
signal even below
On Wed, Sep 4, 2013 at 2:54 PM, Vanush Vaswani van...@gmail.com wrote:
What is the difference between the receiver tech in something like a CSR
chip vs USRP?
Just because you can't see the signal of a FFT doesn't mean you can't
demodulate it ...
Cheers,
Sylvain
This is like a hard comparison; you can't really compare the two.
Howver, both have an ADC. GPS receivers usually have correlator banks to
detect the signal, yielding a large processing gain by effectively using
half eternity of energy.
On 04.09.2013 16:38, Vanush Vaswani wrote:
Ruoyu,
First off, Singapore is a very noisy place (From a radio perspective), so you
are going to have to pair any external low noise amplifiers with appropriate
filters for your signals of interest. It is vital that none of the components
in the radio signal chain receivers too much power
The majority of thermal noise enterimg the receiver is from the antenna and the
path to the LNA. Freeze the antenna and this path, then you may be able to see
GPS.
Lookup the formula for MDS and it will give you an idea of the temperature you
need. Then select a coolant.
Thermal noise is
On Wed, Sep 4, 2013 at 2:54 PM, Vanush Vaswani van...@gmail.com wrote:
What is the difference between the receiver tech in something like a CSR
chip vs USRP?
CSR chip ?
Cheers,
Sylvain
___
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
On 09/04/2013 10:56 AM, Marcus Müller wrote:
This is like a hard comparison; you can't really compare the two.
Howver, both have an ADC. GPS receivers usually have correlator banks
to detect the signal, yielding a large processing gain by effectively
using half eternity of energy.
Well,
http://en.wikipedia.org/wiki/SiRF
On Wed, Sep 4, 2013 at 11:14 PM, Sylvain Munaut 246...@gmail.com wrote:
On Wed, Sep 4, 2013 at 2:54 PM, Vanush Vaswani van...@gmail.com wrote:
What is the difference between the receiver tech in something like a CSR
chip vs USRP?
CSR chip ?
Cheers,
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