Hello,
In the gnuradio/gr-noaa/README file under usrp_rx_hrpt.py, there is a
comment that
reads as follows:
The present HRPT demodulator is only tested at decimation 16.The only other
valid decimation rates are 24 and 32, which may work, but with more bit errors.
No
other decimation
Hi Marcus,
Thanks. That explains it. Will try 5 MHz with our N200.
Cheers,
Dan
On Jun 30, 2015, at 4:56 PM, Marcus Müller wrote:
Hi Daniel,
that README refers to things of the past (when you specified a decimation
rather than the sampling rate you want), and USRP refered to what we
Hi Daniel,
that README refers to things of the past (when you specified a
decimation rather than the sampling rate you want), and USRP refered
to what we nowadays call the USRP1.
In the version of the usrp_rx_hrpt.grc, from which the .py gets
generated, the USRP source is just configured to
Hello,
I was wondering if someone can receive hrpt images from NOAA satellites or
similar, if so, could you help me with the implementation of the receiver?
There is not quite information about that format, so if you could help me I
would really appreciate it.
Hi Pablo,
Googling Noaa image format instantly yielded:
http://commons.wikimedia.org/wiki/File:NOAA_APT_Frame_Format.gif
http://www.sat.dundee.ac.uk/hrptformat.html
It's already been done a few times - for example like this (really just googling
GNU Radio NOAA image decode and clicking the
Hi Pablo,
We are receiving 24/7 HRPT sample images
http://www.poes-weather.com/sample-hrpt.html
Dish: 1.5 m (parabolic)
Elevation over Azimuth rotor, made in FI POES-Weather Ltd
Downconverter LO 1557 MHz (or why not use DBSRX and a 1.7 GHz LNA + some
filter if needed)
USRP1 + TVRX (or 2) or an
Hi Marcus,
APT is (analogue) FM BW ~35-40 kHz and HRPT BW 3 MHz digital.
Using a RTLSDR to receive APT can also be found here using windows
http://www.poes-weather.com/rtl-sdr/
and howto build a good antenna (RHCP) @ 137 MHz here
http://www.poes-weather.com/download/jm-dca/
Patrik
On Tue,
Hi Marcus,
APT is (analogue) FM BW ~35-40 kHz and HRPT BW 3 MHz digital.
Using a RTLSDR to receive APT can also be found here using windows
http://www.poes-weather.com/rtl-sdr/
and howto build a good antenna (RHCP) @ 137 MHz here
http://www.poes-weather.com/download/jm-dca/
Patrik
On Tue,
