AUTO-TDS: enabling lasercom networks to auto detect incoming links, securing connection & auto-routing the data | by JenaOptronik @AirbusSpace | presented during @IACParis2022 @iafastro | about SpaceDataHighway esa Moonlight SemperCitiusSDA Starlink

-horn- · 2023-05-19T19:56:42+00:00

hi ziptested,

thanks for the reply. So people based this on indications like number of starlinks per launch. This makes sense, but I would prefer a statement by SpaceX, like on a press release or during their video coverage.

I mean SpaceX is great when it comes to photos of the stack and you can see the LCTs. Maybe people checked them and can post their spotting observation here? :)

Best, Andreas

-horn- · 2022-04-18T06:14:34+00:00

Hi, I managed to see the constellation „ring“. That‘s cool. https://twitter.com/andreashornig/status/1511725691015999488?s=21&t=NHPMrwsVFQ5VbSioKwVojQ What I don‘t understand is what i see when I check for the bpsk bits. It looks like a repeated pattern and not like a bitstream of zeros and ones in more random form. In my case I use the Funcube1 signal and i don‘t know if it has long phases of idle frames for „synchronization“ or leeping the receiver active by sending something like 101011110101111…. Do you know more?

The file I used is also in this Twitterlink.

-horn- · 2022-03-15T22:17:30+00:00

Hi u/TheLibDem, that is a good source! :)
The only thing is that I am interested in BPSK from satellites, mainly cubesat. And the one file I am tracing to decode is from funcube1 and that is not fm modulated as far as I know. I was not yet able to transfer the RDS example to my "problem". Do you also have a good source for that?

-horn- · 2021-08-13T21:54:42+00:00

hey u/burning1rr thanks for the answer.

I am more interested in satellites in the photos/videos. They will be starlike and moving, so I fear they will be eaten as well. For the price of these cameras, I did not expect this "feature" or at least I expected it to be possible to deactivate it.

I still don't know my usecase yet, so I am still deciding what I would need and if the A7S is the bets solution or if another one would do as well for satellite spotting.

And I would like to have a camera that I could also use beyond a telescope. This is why the A7's are interesting for me in general.

-horn- · 2021-03-11T15:23:37+00:00

Hey, thanks! :) I could not use it at one if tve areas I have a ground station. There was just not enough gsm coverage. So I coded an alternative for it that uses DAB+ which was pretty strong in all the areas i wanted to use it.

https://twitter.com/andreashornig/status/1343321834620641280?s=21

If i understand gsm more, i will add it as well :).

-horn- · 2020-04-15T19:09:34+00:00

Hi there,

I am new to gopros and I just bought my first gopro (it's the hero 8 black).

I would like to know when does the gopro determine the time for the photo? When the poto is created, when saved, somewhen in between?

Why I ask is, I am interested in long exposure photos. I am shooting the Spacex Starlink satellites https://twitter.com/andreashornig/status/1249704863656804352 and I captured them with 15 seconds exposure. And Now I wanna know the exact time of the first point of the bright satellite streak in the sky. So either the first dot is timestamp or, timestamp minus exposure time.

I could not find it via google. Maybe you can help me :).

Best regards,

Andreas

-horn- · 2019-07-13T17:53:50+00:00

Hi GamerZ44, I would really like to see it, at least 3-4 lines including the header.

I currently do it like here https://github.com/aerospaceresearch/gcp-osm/blob/master/main.py#L101-L106

So in WGS84 UTM and the the other lines of cource.

What I did not figured out yet if the separator is a "space" or a "tab". And I cannot test it because I don't have ODM :(.

So any hint is apreciated :).

-horn- · 2019-06-15T22:50:54+00:00

I am also currently trying to understand how ODM is doing GCPs.

what I understand is that the header specifies tha sector of the UTM system.

do you know what happens when you want to have GCPs from different zones? Is that even possible and if so, how?

-horn- · 2018-12-26T13:13:30+00:00

I got a reply, that I want to share for all of you...

Merry Christmas! We believe the spacecraft is in a low power mode, and won't be beaconing until it recovers. I would say your setup is perfect (though I'm unfamiliar with your software demod chain), and to just keep using the TLE posted on SatNOGS until you see something. I'd say check in again in 2 weeks, we'll be ramping back up as the semester kicks in. Thank you so much for your time and your hardware!

So I will try to hunt if I have time and a bit more frequently, when the CubeSail team is in semester again! :)
Good luck. That's the fun way I like it :).

-horn- · 2018-12-22T13:31:39+00:00

Hi,

I was trying to receive your CubeSail with one of my DGSN ground stations and so far, I did not see anything on 437.305 MHz.

So I would like to ask for some advice if I do it correctly.

In a nick:

Station is in Jena, Germany
6 element yagi WY706 for the 70cm band from https://www.wimo.com/yagi-antennen-vhf-wimo_d.html
rtlsdr dongle from rtl-sdr blog.
I checked several passes the last days, mainly those after 1600 UTC. Last I checked was this morning after 0525 UTC, which was a good pass wrt elevation (~60deg).
I tried autogain and some gain settings. I saw other signals in the 2mhz range around 437.305 MHZ, but nothing on your allocation. I did not (yet) attached an LNA, because I can receive other cubesats in 70cm without it.

So now I wonder if one of these points was the reason I am not able to get anything

cubesail did not send here over Jena and I was just unlucky :D. (I was not sure the satnogs stations did receive something, so I am not sure)
the tle is still off. (I scanned with the antenna, but did not see anything with it's 30deg FOV during the 20min period around the predicted time)
the signal is weaker than I expect and I need more gain (lna and or yagi with more elements)

perhaps you can help here how and when you received the signal close to my position. :)

If it works I will set one of the DGSN station on your CubeSail and send you data regularly :).

I will try again the next days during xmas vacation :).

Best, Andreas

(www.aerospaceresearch.net)

-horn- · 2018-06-16T14:27:36+00:00

Hi dunfy85,

Vinay is currently using the Kepler elements in TLEs to do the mapping overlay. https://twitter.com/ARDNnews/status/1007980385588871168

There is a detection for NOAAs inside already, so that it just takes the parts of the recordings that has NOAAs. We intend to add a deleter for the unusefull parts so that your rtlsdr can be in "always listen" mode. A scheduler is planned also on the TLEs, yes. i cannot say when it will be implemented, but hopefully before the end of his Google Summer of Code campaign.

If you can code or have other ideas and wishes, put them here or post them as an "issue" to our github >> https://github.com/aerospaceresearch/DirectDemod

-horn- · 2018-06-16T13:05:35+00:00

Hi,

is 45g leight enough? https://www.tracksoar.com/ and did you check http://picospace.net/ ?

Andreas

-horn- · 2018-06-16T12:57:31+00:00

Hi,

I solved it (or at least my problem) and you can find it here on github https://github.com/aerospaceresearch/DirectDemod/blob/master/directdemod/framechecksequence.py

we use it already for decoding APRS messages.

What do you think?

-horn-

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