HRPT receiver

GNU Radio
1

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.

2

Hi Pablo,

Googling “Noaa image format” instantly yielded:

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 first thing
away…)
http://www.oz9aec.net/index.php/gnu-radio/gnu-radio-blog/350-noaa-weather-satellite-reception-with-gnu-radio-and-usrp
but here, Alexandru C. used a GNU Radio-Based flowgraph just to
record the received signal to a Wav file and process it via atpdec

and, honestly, how cool would it be if you wrote a small piece of GNU
Radio software that had a signal sink, which used the atpdec code and
displayed images in a window? (Hint: awesome).

So:
Happy Hacking,
Marcus

3

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

4

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 USB SDR dongle.

GR HRPT RX software that can be found in examples.
An enhanced version can be found here poes-weather (POES-Weather Ltd) · GitHub
(gr-poes-weather), it is NOT compatible with the latest GR…but should
not be that tricky to update.

Youtube, testing the proto-rotor

Patrik

5

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