Well, it depends on what you mean by autonomous landing. If you put ArduPilot into a loiter and the the battery low-voltage cutoff stops the motor, it will gently glide into a pretty nice landing with an EasyStar (we'd done that plenty of times). But if you want it to line up into the wind down the middle of a runway and flare at the last second, no it can't do that. No amateur-grade autopilot can.
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