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Homemade polarimetric synthetic aperture radar drone
Designing a cheap synthetic aperture radar mounted on FPV drone.
I bought the cheapest Chinese no-name 7-inch FPV kit and a small GPS+compass module to support autonomous flying with the goal of making a light weight synthetic aperture radar system that it can carry. This autofocus algorithm works by forming the radar image, calculating the gradient of the input velocity, and clipping the learning rate to limit the maximum position change to a predefined value. Natural targets such as the ground and forest look very similar at different frames, but at several points in the video large reflections can be seen for example at bridge and power lines when they are oriented at a 90-degree angle to the radar.
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