Hi everyone,
I just made a bet with some local professional jammer manufacturer who is too confident with their product.
I'll take them out if I can manage a flyaround over their premises.
Their product is no joke though. As far as I could understand, it scans the entire spectrum and jams the suspectable frequencies but obviously there's something more to it which they won't tell me.
I've thought of below ideas for flight over a jammer-proteced zone. I'll be obliged if you could share your ideas:
1-) Using a 27 or 40Mhz AM/FM remote (the jammer may detect this but won't hurt to give it a try)
2-) Cable remote (there are 4gr/m cables)
3-) Infrared controller (can be modified for long range)
4-) Computer vision?
5-) Trying u-blox M8 3D Dead Reckoning GNSS chips (no idea how they perform or if manageable with arducopter)
6-) Autonomous flight without GPS and radio control (e.g. command Arducopter to take off, climb to 100m (barometer) fly north for 10 sec at 15m/sec (air speed sensor + compass), fly west for 5 sec. etc. I'm not sure if this is possible for arducopter.
Thanks in advance for your input.
Comments
80m (262 feet) not enough :)
Something like this: https://www.amazon.com/Illuminators-Infrared-infrared-Night-vision-...
You just need a proper driver %-)
No, there is not any ir jammer.
I know, IR is optical but I have to reach jammed area . I mean, I need very powerful IR LED array :)
What jammer? Do they jam IR now? IR is optical, all you need is LOS and powerful enough array.
Andrew: what about the range? jammer easily reach to 1000m or more
Switch to IR. Big array of IR LEDs blasting PPM from your transmitter and 4-8 standard IR receivers ORed and feeding your PPM directly into your controller.
Hi Alp,
Indeed:)
Please check this blog post on DIYD.
Cheers
Aytek
The simple approach is to set up for a full autonomous flight profile and remove all radio gear from the drone itself.
Not sure if Ardupilot will let you do this stock, but you can modify the code so that it will.
Beyond that I would suggest shielding the electronics in case they try high energy EMF or RFI discharge to interrupt or overwhelm internal electronics / signals in general and especially shielding GPS antenna from sides so they cannot override your GPS signal.
As the previous post says the GPS is the weak link, but if you shield the GPS chip and allow only signal from overhead to hit antenna you should be OK, GPS signal is very highly directional and if you recieve only GPS signal from directly overhead you should inhibit GPS jamming or takeover.
It may require a cylindrical GPS shield port exiting the electronics shielding above the GPS antenna to ensure only signals from overhead reach the GPS.
Graphite or carbon paint on the inside of the antenna shield will also help as it doesn't reflect RF but absorbs it and turns it into heat.
You can by RF shielding paint on Amazon.
I doubt they can screw up your electronic compass unless they get very close.
The weak link in 'drones' is the GPS receiver. If the jammer decides to jam that, then he'll jam it for every other GPS receiver in the vicinity (unless of course he's using a directional antenna pointed at the 'drone').
However, if there is a workaround, then it will be in inertial tracking where the flight computer makes estimates of it's flight path & speed based on previously learned information during the last time the GPS was working. The flight computer can make estimates for wind speed, and it's own airspeed based on various pitch angles. All this info put together should make a rough RTH possible without GPS imho.
A working compass will be required unless it's also possible to use the gyro if it doesn't drift too much, but from what I've heard, gyro drift is a show-stopper.
I thought using satellite map navigation has been used for quite some time already, at least by the military.
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