Electronics > Projects, Designs, and Technical Stuff
Digital FPV video for drone racing
Marco:
With 166 nanoseconds between each symbol you can swallow a few picoseconds.
Marco:
--- Quote from: IDEngineer on January 22, 2019, 12:10:30 am ---"Impounding" vehicles is a non-starter... folks have to work on/repair their aircraft between races. Props break, wires get sliced, PCB's and/or their components get dinged... it's a lot like an airborne demolition derby. Impound aircraft and the sport will cease to exist overnight.
--- End quote ---
Just disallow any power sources in controllers and drones except during racing or specifically allocated testing periods. Any time you power it on there is a non acceptable risk of interference, there is no need for that ... only want.
Kilrah:
Back in the day when we were figuring out what existing analog VTXs to use for FPV it was common for some of them to be severely affected by vibrations indeed, to the point of having a barely viewable picture with common prop vibration.
--- Quote from: IDEngineer on January 22, 2019, 12:15:10 am ---EDIT: However, this only works if all pilots in the area switch to the new system. Otherwise the new system would be susceptible to a "old school" pure analog transmitter being powered up.
I suppose if we used the entire available ISM band for the spread the effect of a single analog channel powering up could be minimized, but realistically any SS system would have to be designed to accommodate multiple pilots simultaneously... and we're back to channelized allocation again
--- End quote ---
Why? RC radios use the whole band and can coexist just fine. OK lower bandwidth, but larger numbers too...
--- Quote from: Marco on January 22, 2019, 01:58:26 pm ---Just disallow any power sources in controllers and drones except during racing or specifically allocated testing periods.
--- End quote ---
Again for repair reasons you can't fully disallow any kind of power source, if you did not let the pilots test for repairs other than VTX-related during other races you'd then have to lose way too much time between races with testing periods.
For the VTX there's already a system for this made by a manufacturer, when checking in to a race the contest organizer essentially disables your TX so you can power it up all you want but it'll never transmit. When the participants are ready on the start line the race director goes by with the NFC programming wand to enable them until the next power off.
But that's not practical, because people also damage/break their TXs so they need to test them, and going to everyone between races to re-enable to allow testing then re-disabling before the next would be basically impossible. But there are easy ways to make that better, e.g. a longer range link similar to the R/C system built on the TX and a central "server" station managed by race directors, anytime someone powers up a TX it queries the server for whether it is allowed to transmit and only does so if answered positively.
Marco:
--- Quote from: Kilrah on January 22, 2019, 02:06:29 pm ---Again for repair reasons you can't fully disallow any kind of power source
--- End quote ---
My intuition says that unless you create some kind of standard which allows a physical detachable interlock which referees can easily check/control to keep people off the racing bands, which batteries are in a way, I'd say the odds of interference are in the whole percentage points if someone does a powered test during a race.
So it's just a question of what you find acceptable risk ...
Kilrah:
That's why I mentioned other solutions to prevent transmission that are reasonably tamper-proof and don't prevent aircraft testing.
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