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does the drone ID structrue same in lightbridge? #28
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@proto17 Any ideas? |
You have an Aeroscope for testing? Cool.When you say power on RC, do you mean both RC and drone? otherwise, are you implying the Aeroscope signal is from the RC? It is not a RC signal right?From my observation, the Aeroscope signal (Ocusync based, from the drone) is only visible when the RC is connected. Can you share the IQ data with us?On Nov 18, 2022, at 8:13 AM, Lobart ***@***.***> wrote:
Hello! I see on signals of Inspire 1 and it is not same frame.
It has 1.2-1.5Mhz bandwidth.
And i did experiments with aeroscope, and when i power on RC, aeroscope see this.
When i power on only UAV, aeroscope doesnt see this.
—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***>
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@planewave No, aeroscope listen not only ocusync. Lightbrige and wifi too. |
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@lobart the signal you posted doesn't appear to be DroneID in bandwidth or structure. That signal looks like it has a very short repeating preamble which isn't normal for DroneID. My guess is that's the uplink signal from the controller to the drone. Most of DJI's product line that isn't WiFi will hop on every transmission for the uplink, and they tend to be very narrow in bandwidth (~1 MHz). So that's a pretty good way to tell if you're looking at the uplink or some other part of the system. |
@proto17 @planewave |
@lobart |
@proto17 so do you have any idea regarding the DJI drone ID in Lightbridge? |
@planewave it's definitely possible that the uplink contains some of the same kind of data that the DroneID frame does but not actually be DroneID. Think of it like a side-channel that sends additional arbitrary commands to the drone along with the stick control values. I have seen information come off of Lightbridge controllers like position, drone name, mission information, etc. But have not seen anything like DroneID over the Lightbridge uplink. It's important to know that I haven't looked at Lightbridge for several years, so it's possible it was updated to also contain DroneID. |
Hi @lobart , since you have access to the Aeroscope, I have an idea to verify our assumption. You can replay the suspicious narrowband signal at the original frequency using your SDR and see if it can be picked up by Aeroscope. If so, please share the date and I will see if I can decode it |
Hi everyone, |
@arglas864 lightbridge has not drone id. |
@lobart the Aeroscope clearly supports the detection of the lightbridge drones. you can find them in this list @arglas864 I am facing the same difficulty. it is likely the drone ID is inside the video link. but no matter what, the first step will be unpacking the drone or RC's packet and extracting the payload. It is a very difficult reverse-engineering task given very little information. what I know is that it is loosely based on the 802.16e (mobile WiMax) protocol, some questions I have are
Above all, assuming we do manage to decode the packet, how can we say a drone ID is in such a packet? |
Hello friends. I have the opportunity to check the recorded signal on the aeroscope. I have HackRf |
@planewave did you have any luck decoding the downlink yet? have you been able to get an idea about the randomizer used? |
@anitasusan Sorry, I haven't worked on it for a long time. no conclusion. |
Hello there
I know DJI no longer uses the lightbridge for video transmission, but there are some third parties still using it. do they transmit the drone ID too? if so, is the packet structure the same?
thanks
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