RIASSUNTO
The work proposes different methods to avoid various fields from the invaders such as birds, animals etc. These factors cause a huge impact in the fields such as Airports, Gardens, and Agriculture. Methods such as Image processing, radar system, voice recognition, and motion sensors are used for detection. Image processing is used for template matching, Radar system classifies the birds and it determines the position of the same, its range is about 5km. Ultrasonic sound, light source and robotic hand movement is used for chasing invaders. This survey is intended to give information about existing approaches and provide a better solution to overcome the current problems.