Drones That Can Flip, Chase, and Catch Each Other Mid-Air Are Getting Very Real
Two new research papers out of arXiv show acrobatic drone control has moved well past party tricks and into genuinely unsettling territory.
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Two separate research teams have published work this month showing drones can now perform continuous multi-flips, high-speed circular flight, and even chase and physically capture other drones in mid-air. I'll be honest, when I first skimmed these abstracts I thought someone was pulling my leg.
The first paper is the flashier one. A team has put out a framework they're calling TACO, which stands for Target-and-Command-Oriented reinforcement learning, published over at arXiv. The basic idea is that previous acrobatic flight controllers were each built for one specific maneuver. You want a barrel roll, you train a barrel roll controller. You want a flip, different controller. TACO tries to unify all of that into a single policy that you can adjust on the fly, changing flight pattern parameters while the drone is already in the air. They validated it in simulation and in real-world tests, and the results show high-speed circular flights and continuous multi-flips. Not one flip. Multiple flips, back to back.
What caught my attention as someone who spent a lot of years thinking about motion control, the sim-to-real gap problem is the part they've actually done something interesting with. When I was at Kuka, we used to joke that simulation was where robots went to look impressive before reality humbled them. Getting a controller trained in software to behave the same way on physical hardware is genuinely hard, and these researchers address it with something called spectral normalization combined with input-output rescaling, which is aimed at keeping the policy smooth and consistent across both time and space. Whether that fully solves the sim-to-real headache remains unclear, and the paper is based on a fairly controlled set of experiments, but it's a more principled approach than a lot of what I've seen.
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