DragonOS Focal demodulating 5GHz analog drone video (SigDigger, SDRangel, BladeRF)
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- Опубліковано 29 сер 2024
- Taking a look at the new analog TV viewing option within SigDigger that'll be added in the next DragonOS Focal build as well as SDRangel’s ATV demodulation feature that is currently included. A 5GHz Drone FPV camera is used to broadcast a live feed while the BladeRF (HackRF will work) is used to receive the signal.
I show how to record, play back, and demodulate the signal in SigDigger and then show how to receive it live with SDRangel.
batchdrake.git...
github.com/f4e...
Hey Man, first of all thanks for ur time n dedication, is there a live demodulator since this vid got released ? I mean like.. to make the hackrf into a 5gig drone vid receiver?
SDRAngel can live decode a 5Ghz analog drone feed. But that’s what I cover in this video. I can’t think of anything else off the top of my head.
thanks for the video, I am curious to know if you had a right hand polarized antenna when running this
My brain isn’t fully awake yet but it was one of those “cauliflower” or FPV cam antennas I had installed on the hackrf when viewing the feed.
@@cemaxecuter7783 thanks for the reply. I am having issues finding "ATV" on sigdigger, does it come loaded by default? Or does it have a different name. I have some FPV antennas i wanna try out and might even make a video to help the next guy.
@MrKaleidoscope it does have a ATV portion to it but you have to open an inspector and setup for it. I think I have another video dedicated to doing so with SigDigger.
Please do @@cemaxecuter7783
Just showing the waterfall chart (no further data processing than the visual) would be of great help during drone races (8 pilots in the air on 5.8Ghz band). So for over the FPV analogue range of 5.7-5.9Ghz (resolution of 20mhz?) - would there be a solution with an RTL-SDR dongle and a downconverter? Or would the HackRF still be the cheapest path if you just want visualization (RX)? What would you do?
Great point and now you have me thinking maybe a modified Pluto would be a cheap alternative. The Pluto SDR doesn’t ship with the 5.8ghz range available but the hardware supports it. There’s a bunch of videos showing how to modify it. An example here
www.rtl-sdr.com/adalm-pluto-sdr-hack-tune-70-mhz-to-6-ghz-and-gqrx-install/
I do want to get a Adalm Pluto and try this. If I get one I’ll make a video. Plus I hear there’s great support for it within sdrangel.
It’s got the bandwidth you’re looking for and it’s about $150. Just needs the modification done.
@@cemaxecuter7783 did you ever get one?
To make it clear no way get the basic FPV stream on the Portapacks inbuild analog TV feature.
Are new to this, but tried with my unit and just going directly to the FPV bandwidth looks something like this .i.imgur.com/RCGPbXD.jpg
and on the analog feature like this i.imgur.com/4gLFe8h.mp4
definitely data there, but likely not enough tools to synch it.
Love the setup! I really need to get a portapack. I honestly didn’t know it had that feature and it almost looks like you got it tuned. I have what looks like that same exact camera you have laying there. You’d think though if it has that analog feature it should be able to view it. Does it give you any options similar to sdrangel?
What hardware are you using to receive the signal?
I think in this video, blsderf, but it can be easily done with the hackrf too.
👍👍👍
I have SDR Angel Software and SDR Uno Solfware work's with both SDR Play RSP DX and a Adalm Pluto SDR,
That’s awesome, I’m keeping an eye out for the v7 sdrangel deb package. I hope SDR Uno will come to Linux some day!
i wish we can broadcast analog channels with this thing
github.com/fsphil/hacktv
@@cemaxecuter7783 hacktv Even works with a rpi4 and hackrf. But wish i can do DTV.
One of these days I want to make a pi distro. There’s so much that can be done with the pi too!
@@cemaxecuter7783 I would love to play with that.
You should be able to do it with gnuradio, I think I looked at making a video on this. I’ll have to see if I did but here’s a quick article about it
myriadrf.org/news/digital-video-transmission-using-limesdr-gnu-radio/
Is color demodulation also possible ?
That’d be awesome but not possible with this method. I will say that in later testing I got an extremely clear and smooth picture but adjusting sample rate/bandwidth etc. I was really surprised.
Why is the video in black and white though?
Limitation on SDRAngel’s demodulation mechanism most likely. Good question though.
Is it possible to demodulate DJI Mavic video streaming?
Not with this technique. Pretty sure DJI uses digital and/or some other techniques. If you google analog fpv camera you’ll find some for like $15 and they’re normally sold for racing drones.
I believe the consumer drones like mavic still use regular Wi-Fi (as opposed to lightbridge on the pro level) - but you’d need more than this. Breaking the encryption would be the first step, so not sure it’s worth the effort in most cases. If you have the key, something like dragonfly for android could work.
@@digus I see. I'm currently doing a research project on DJI Mavic 2 Pro, but I'm stuck at demodulating its signal which I believe DJI is using OFDM.
TheEpicProduction - Before trying to receive/demodulate/decrypt any radio source, I look for the FCC ID, which will be on the transmitting device. Then, I just enter it into this website: fccid.io Once you’re at the FCC information, download the ‘RF Test Report’. It will tell you everything that you need to know, except for decrypting an encrypted signal. I know that DJI isn’t encrypting their video signal. It’s simply a digital video feed. My Yuneec drones use the same format. I can watch the video through a browser, on my laptop or iPad, with an RTSP connection. This should get you started. en.wikipedia.org/wiki/Real_Time_Streaming_Protocol You can also just Google how to receive the video, and then go from there. I hope this helps!
TheEpicProduction
Oh wow, that’s cool - so being the “pro” model, I’m pretty sure you’ll have ocusync to deal with. I believe it’s using some type of spread spectrum frequency hopping techniques. I’m no expert but FHSS could certainly look a lot like ODFM at first- kind of like moving around quickly, vs multiplexing on different frequencies..?
As far as I know, neither DJI protocol has been defeated publicly, yet. I just have an old P4P and do not really stay on top of these things any longer, so I could be off on some of this.
@William J is absolutely correct that the FCC site is pretty much always the best place to start.
So while they may all be using RTSP on the inside, the difference between a mavic Air (WiFi) and a Mavic pro (ocusync) will likely be quite a bit different in the (propriety) wireless encapsulation technique.
Any latency?
I don’t recall it working as well as SDRAngel. SDRAngel was real-time and really clear. I’ll have to give SigDigger another try, but from memory I didn’t have as good as result at the time.
@@cemaxecuter7783 thank you very much for the fast response :)