Why is there so little interest in this community to reverse engineer signals from satellites and space probes? There are a lot of satellites in LEO from which you can record signals using a cheap Yagi antenna. A lot of them do not encrypt telemetry data. So far I've picked up raw signals from NOAA, ISS, and a couple of cubesats but yet to reverse engineer all of them them.
For those interested in a more advanced setup, you can get a USRP clone for less than $1K and a dish, rotor and a couple of LNBs for another $1 or $2K. For $2K, you can even get a complete dish+rotor from surplus equipment dealers and I'm talking about the kind that the Navy uses for their satcoms. That's not much compared to how much you morons spend on just GPUs.
because most people on Sup Forums are NEETs and not really smart.
Andrew Torres
what are you looking for in the signals...what do you mean by reverse engineer? Taking FFT of a signal to pick out its frequency profile seems pointless
Eli White
because I did all that shit in 2015 with an rtl-sdr.
I even bought an SDRPlay. Good fun for a while.
Owen Bennett
Sup Forums fails at event port forwarding
Michael Lopez
did what...you retards don't even know wtf you are talking about
Gavin Lopez
this was for you
Jose Cooper
Because not only is that shit 2hard4me, it's expensive. Why drop thousands on radios to do things that will probably just land me in jail for "cracking federal communications equipment" or some gay shit like that, when I can instead spend my time learning the latest javascript meme framework for free and switch to a job that pays more than the one I have now?
Jason Collins
Oh, someone that's interested in my hobby.
Noaa is a piece of cake, still has analog picture transmission, but hires needs a motorized antenna.
Meteor M2, Russian Meteo plar Satellite, offers a digital qpsk signal @ 137 mhz , easily received with omni antenna.
See pic for the final result. Received with a 7 euro DVB dongle and homemade helicoidal atenna (free)
Pretty much your amateur radio mauals howto and stuff. Plus all you can find by searching a topic on Google. You'll find all you need there.
You can start building the simpler turnstile antenna, has circular polarization, which is ok for receiving 137 mhz sat. signals.
You'll just need to understand what wavelength is, and how to make a dipole with the right formula. Also the concept of 'balun' and impedance matching.
For the rtl sdr dongle, just buy one, install zadig drivers,and practice using sdrsharp for a while
This is a good starting point. Once you've identified the type, you can then attempt to decode them using GNU Radio into a bitstream and try to gain meaningful information from them. This would be looking at a binary stream and figuring out what the serialized components are and see if you can find any meaningful information in them.
Michael Edwards
This is a nice image. We did a project where we used multiple antennas and RTLSDRs to capture the same transmission, sync them and average them to remove all noise from the image. You should definitely try this. You can multple multiple signal sources in GNU Radio.
Jonathan Parker
Yes but the skills required are probably beyond this board
Robert Hernandez
It is possible. You don't need more than 400-500W of transmission power to transmit to space and it's very cheap.
If you can figure out the proprietary communication protocols and can sign your transmissions with the appropriate keys, you can theoretically take over them.
Joshua Jenkins
You can do this with about 10 bucks, a laptop made in the last 10 or 15 years and some rubbish along cables and solder, and avoid known government satellites or only target civilian cubesats You can but it's usually pointless if they can be cracked without being a state actor
Blake Howard
The truth is that nobody does it because it's a waste of time and money Why would I do all this shit for pleasure if I can have fun for free playing vidya? If I was going to spend that much time at money at least I'd do something I can share with normies without sounding like a mad scientist, like photography, restoring a car or making a videogame
Nicholas Price
>and can sign your transmissions with the appropriate keys So not really then.
Aiden Powell
Sounds interesting, any good resources?
William Rogers
I mean, you'd think satellites would have top-tier crypto, what with them being so expensive and all. Maybe even OTP, how much movement data can you realistically need to communicate to a satellite? On the other hand, America lost $125 million of Mars Climate Orbiter because they got confused between imperial and metric units, so...
Andrew Allen
seen one signal, seen them all
Hunter Cruz
Give an example of "meaningful information".
I do some of this stuff for schoolwork/research but I don't see what the average person would want from it other than the joy of tinkering with radio/signal processing (which is too nerdy even for this board).
Eli Ramirez
That’d be be a fun way to wake up to a flash bang at 4am
Jeremiah Flores
of course they exist, how would GPS work, doofus.
the only thing people don't understand is that satellites get smaller as they go further up, and they start orbiting around the north pole, making lissajous figures.
Jack Carter
what's the point of intercepting noaa images? are they not distributed anyways? also i am highly suspect; this stuff is likely encrypted
Camden Hernandez
Prove me the satellites can exist with the current flat earth, that we live on
Thomas Gutierrez
This might work on Sup Forums though.
Adam Stewart
Nigger it's called a hobby all it has to be is interesting
Elijah Thompson
but why not though
consider, a lot of sats are really old, what signing mechanisms do they use?
