PTU, produced by Shanghai TopXGun Robotics Co.,Ltd., is a data transmission kit on the basis of XBee communication module. PTU is mainly used for data transmission of current flight controller T1. Based on ZigBee agreement, PTU transmits unmanned aerial vehicle’s (UAV) real-time status data to ground stations by wireless communication, and also provides users from ground station with control access to UAV. Each PTU data transmission data kit includes two parts: sky terminal and ground terminal. Interfaces from two parts are simple, allowing users to start with quickly. PTU data transmission kit has the following characteristics: