Abstract In UAS’s (Unmanned Aerial Systems) applications, it is important to find and track all scenario properties (e.g., obstacles). Performing obstacles and terrain avoidance from an UAS platform is challenging for several reasons (Valavanis 2007). The UAS limited payload and power available give significant limitations on the total size, weight, and power requirements of potential sensors. In this chapter, a Sonic Ranging (SR) sensor was used in order to detect any oblacles that surround the UAV. The system proposed it is able to detect obstacles like dolphins or bats do.


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