Drones have become more common, and are commercially available for consumers. Small drones can be used for unauthorized information gathering, or to cause disruptions. This has created a need for safe, effective countermeasures against drones. In this thesis, a method for countermeasures against drone imaging is investigated. The method is based on aiming and focusing a laser beam toward the camera of the drone. The retroreflection from the target is used as a feedback signal. Risley prisms were used to aim the beam, and an electrowetting lens was used to control the focus. Control algorithms based on the method called Stochastic Parallel Gradient Descent (SPGD), line searching and the Kalman filter are presented and evaluated. An experimental setup was used to track a moving target and dazzle a camera, demonstrating the validity of the method. Additionally, a simulation environment was used to estimate the potential performance of the control algorithms in a realistic scenario, under ideal circumstances.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:liu-178918 |
| Date | January 2021 |
| Creators | Grundmark, Jens |
| Publisher | Linköpings universitet, Reglerteknik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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