Monthly Archives: October 2016

GOES Satellite Hunt (Part 2 – Demodulator)

In the last episode of my GOES Satellite Hunt I explained how I manage to build a reception system to get the GOES LRIT Signal. Now I will explain how to get the packets out of the LRIT signal. I choose the LRIT signal basically because of two reasons:

  1. It contains basically all EMWIN data + Full Disks from GOES 13 and 15.
  2. Less complexity on the demodulator side (Simple BPSK Demodulator)

This is the LRIT Specification (theoretically):

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GOES Satellite Hunt (Part 1 – Antenna System)

So few people know that I started a crusade against GOES 13 Satellite. My idea was to capture the GOES 13 signal (that’s reachable in São Paulo) with a good SNR (enough to decode) and them make all the toolkit to demodulate, decode and output the images and other data they send. I wanted a high-res image, and the L-Band transmissions usually provide that (GOES for example is 1km/px with whole earth sphere in frame. A 10000 x 10000 pixels image)

So I choose GOES over other Weather Satellites mainly because GOES is a Geostationary Satellite. That means its position never change. That was needed for me, because L Band usually needs a relatively big dish to capture the signal, and if the satellite is moving, the antenna needs to track it. That means: Alt-Az tracker (or something else) that will be most likely more expensive than the whole capture system (at least in Brazil). Since GOES does not move, I could just point my dish and forget about it. It would always capture the signal.

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