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Jamming drones is easier than you think, the new battleground will be autonomous flying to avoid trivial radio/gps jamming. MIT has open source code for this al
by ShorsHammer 8y ago
Jamming drones is easier than you think, the new battleground will be autonomous flying to avoid trivial radio/gps jamming. MIT has open source code for this already.
https://www.youtube.com/watch?v=_qah8oIzCwk https://www.youtube.com/watch?v=_qah8oIzCwk
https://github.com/andybarry/flight https://github.com/andybarry/flight
- a012 8y agoI'm no expert but how autonomous works if there's no positioning methods involved? (To avoid GPS/GLONASS,... Jamming)
- microcolonel 8y agoFused dead reckoning can work, especially if you mix camera and IMU (or more than one IMU!).
- candiodari 8y agoSee the paper, but TLDR: stereo video depth sensing combined with fading previous measurements (so if you detected an obstacle at 1 o'clock, 2 meters out 1 second ago, it is now very likely at 2 o'clock, 1.3 meters out. This way you can limit yourself to just detecting things 2 meters out)
- pjc50 8y agoCruise missiles have an optical terrain-following system, that would be a viable approach for drones.
- kevin_thibedeau 8y agoThey use radar. https://en.m.wikipedia.org/wiki/TERCOM https://en.m.wikipedia.org/wiki/TERCOM
- omegant 8y agoInertial navigation and maps.
- tfolbrecht 8y agoSurprised nobodies mentioned celestial sensors. Celestial navigation by imaging the sky, and combining that data with a clock and compass.
- varjag 8y agoVery unreliable for ground based systems.
- fulafel 8y agoAnother technique not mentioned yet: compss augmented with local magnetic field features.
- red75prime 8y agoBattleground? Are there many problems with Kalman filtering and preloaded maps of a path?
- microcolonel 8y agoNot only that, GPS jamming can be overcome with better antennas (phased arrays of such, even retrofitted to existing commodity receivers) to eliminate jammers which are not more-or-less directly above the vehicle.
- ShorsHammer 8y agoExcellent article on anti-jamming: http://gpsworld.com/anti-jam-technology-demystifying-the-crpa/ http://gpsworld.com/anti-jam-technology-demystifying-the-crp... > CRPAs work by exploiting spatial diversity; that is, making use of the fact that the desired satellite signals, and the unwanted jamming signals, generally arrive from different directions. In simple terms, you create a spatial filter, one that removes signals that arrive from particular directions, whilst letting through signals from other directions. To achieve this, rather than use a single antenna, we use an array of antenna elements.
- candiodari 8y agoWell, yes. Maps aren't accurate (when it comes to moving foliage, as in the video, there maps are out of date within seconds, less in strong winds). Maps don't include many things that are moving, and maps just generally don't work very well at small scales (like the scale of an, even a large, UAV landing)
- bjoli 8y agoHow about going low tech and just use gyroscopes to keep steady and fly in a straight line until it is unlikely that any jamming might occur?
- salty_biscuits 8y agoGyros drift pretty quickly (the cheaper the quicker). Yaw is hard to pin down when flying in a straight line even with a dual frequency gps.
- ShorsHammer 8y agoProbably fine and less vulnerable in situations like simply trying to get a few km over a wall on flat ground. Far more complicated over terrain and trying to fly low. Off-the-shelf open source consumer drone flight controllers already have enough sensors to achieve what you suggest.
- ryanmarsh 8y agoThe SR71 had a combination of star and inertial navigation. I imagine someone could build an astro-inertial navigation system today without much trouble.