[time-nuts] Re: A hobby application of precise time or frequency

[jeanmichel.friedt at femto-st.fr]

>> I was using WXTOIMG software but on the 136.5MHz frequencies to capture images from these polar
>> orbiters. I used a home built Quadrifilar Helix antenna (QFH) and an ICOM PCR-1000 @50KHz bandwidth
>> to receive the signals. I think the last image I captured was 15 years ago. With GOES, I think the
>> polar orbiters are going obsolete and not being replaced.
>> Bob
> 
> Actually the next generation of polar orbiters are due to be launched starting this year. More
> information:
> 
> https://www.eumetsat.int/metop-sg

GOES (or any geostationary satellite) can only image with reasonable resolution up to /-60 degree
latitude, whereas polar regions are fundamental information for modelling weather patterns.
The newer digital polar weather satellite decoding is a bit more involved than the POES analog signals
http://jmfriedt.free.fr/glmf_meteor_eng.pdf but do provide opportunities for spaceborne LEO time
transfer opportunities.

Best, Jean-Michel