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Weather Satellite Receiver

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Edited by racercdl at Feb 05, 2016 07:26

Ok so I'm creating this post here to keep all of you track of my project of Weather Satellite Receiver project!

So the project is current at LeMaker Guitar Free Activity here: http://www.lemaker.org/project/index/project_id/27.html so if you like the project, please vote it

Also here is the project Repository: https://github.com/racerxdl/open-satellite-project - I will post everything related to this project in the repository, so if you want to build your own, please check the repository

The project will include details from the build of the Hardware and Software to get NOAA Satellites Images, and if I can, also LRPT (The digital ones) Images from Meteor and other Sats.

So for now in the repository I have the Synchronous APT Decoder working in Javascript. I'm currently porting it to C to get it more optimized.
The code will also include a satellite tracker to track which sats are in range so we can tune the SDR to capture its images.

So the final idea is to have a autonomous station that can receive images from any available satellites automagically and store it somewhere.

I will make a full review of how LeMaker Guitar performs with this task (and probably will perform very well).

So for the parts, I will use:

- Double Cross Antenna (Home-made)
- RTL2832U SDR (A cheap DVR Receiver, costs about US$20)
- LeMaker Guitar
- Fun

Keep in track for notice!

Lucas

EDIT: So I got my first images using a RTL-SDR. If you want details: http://www.teske.net.br/lucas/2016/01/qfh-antenna-and-my-first-reception-of-noaa/
Soon I will have the LeMaker Guitar Working with my OSP Project. Currently you can record manually using a RTL-SDR Dongle, GQRX and decode using atpdec. All of them are available in the apt-get for debian based distros ^^

EDIT2: So I made a short review about LeMaker Guitar. Here is it: http://www.teske.net.br/lucas/2016/02/lemaker-guitar-review/

EDIT3: I also made a How-To to capture NOAA APT Signals using Linux (works on LeMaker) : http://www.teske.net.br/lucas/2016/02/recording-noaa-apt-signals-with-gqrx-and-rtl-sdr-on-linux/
Double Cross Antenna in Progress

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Edited by racercdl at Jan 17, 2016 09:23

OK so I decided to make a Quadrifiliar Helix antenna instead the Double Cross. So yesterday I finished and tested it. I based the project of the antenna from here: http://www.jcoppens.com/ant/qfh/calc.en.php So here are some pictures:

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Ok so I decided to write a post on my blog saying how I build the QFH Antenna and how I got my first Satellite Images. The LeMaker Guitar Station is comming soon

http://www.teske.net.br/lucas/20 ... -reception-of-noaa/

Tido  
Edited by Tido at Jan 25, 2016 11:14
racercdl replied at Jan 25, 2016 05:01
I build the QFH Antenna ...

Hi Lucas,

I am impressed what you have done.
I didn't know that you can receive with a coax-cable I thought this is good for insulation and not for receiving a signal.

I saw on the picture you also used an USB device.
It would be nice if you list what kind of parts /plugs and software you are using, like a BOM (bill of material).

Another thought that striked me, what if a lightning hits the antenna?
The picture with the mapping and cloud, does it come like this from the satellite?

And not just humans even cats show some interest

Cheers
Tido

Tido replied at Jan 25, 2016 04:12
Hi Lucas,

I am impressed what you have done.

Hi Tido, and Thanks!
I am impressed what you have done.
I didn't know that you can receive with a coax-cable I thought this is good for insulation and not for receiving a signal.

Yeah but basically the coax braid and conductor are tied together in the two loops, so it is basically acting as a single conductor. I just used coax cable because it was the hardest cable I had to make the loops. I will do another antenna with a copper pipe ^^

I saw on the picture you also used an USB device.
It would be nice if you list what kind of parts /plugs and software you are using, like a BOM (bill of material).

Yeah its a RTL-SDR Device. It's basically a DVB-T Dongle that have a RTL2832U chipset. You can search for RTLSDR in Amazon, Dealextreme and other places that you will find a compatbile device. Also would be good if LeMaker can do a dongle like that, since its cheap (or maybe even embed on a ARM Base board ).
I have used both SDR# (Windows) and GQRX (Linux) to record the baseband and audio. And on windows you can use WXtoIMG to decode the APT Audio Signal.

I'm also doing a project called Open Satellite Project, that is a receiver station and server bundle that automatically tracks the satellites and record the signals when they are in range. After that it decodes an generates the image and uploads to a server. My idea is to have a global-wide stations all spread and generate the most realtime possible stitching of the globe - The project is hosted on github: https://github.com/racerxdl/open-satellite-project

Another thought that striked me, what if a lightning hits the antenna?

Yeah this can be really bad. Not in my case to be honest. The neighborhood have a lot of anti-lighting towers and also I do have in my roof. After I finish the coding and making it work on LeMaker Guitar, I will post a schematic of lighting filter. But for now if anyone is concerned about lighting, you can use a normal antenna protection for that since all cables (and the antenna) is 75 Ohm and works on a compatible frequency of TV Receivers.

The picture with the mapping and cloud, does it come like this from the satellite?

With the cloud, yes. The borders from countries / state dont. Also the image is black & white. That image is a output of WXtoIMG (I'm planning to do on my project as well with fully opensource code), but basically the satellite sends two channels, one with Near Infrared Image and another with Thermal Infrared. With these two images you can compose a fake color image (like the one I had on my article), also you can use these two informations to see what is ocean, what is vegetation, what is burning, etc...
About the borders from countries / states, the WXtoIMG put a overlay over it because it knows where the satellite was (because of the time sync), I'm planning to do this as well on my project.

And not just humans even cats show some interest

Yeah, they really do xD

After I finish getting the station to work with Guitar Board, I will make a tutorial how to make it work


Lucas

UP: I added my LeMaker Guitar Short Review link to the original post. For those who are reading here: http://www.teske.net.br/lucas/2016/02/lemaker-guitar-review/

UP: I added a Tutorial to capture NOAA APT Signals using Linux (Works on LeMaker Guitar with Lemuntu): http://www.teske.net.br/lucas/20 ... d-rtl-sdr-on-linux/

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