1. Nano UAS PD-100 Black Hornet, https://bssholland.com/products/nano-uas-pd-100-black-hornet/
2. A closer look at the drone attack on maduro in venezuela;Koettl;The New York Times,2018
3. Drone usage by militant groups: exploring variation in adoption
4. NATO, “ATP-3.3.8.1,” 2016
5. Visual odometry;Nistér,2004