Unmanned aerial vehicle control system and implementation method therefor, ground control device and relay station

A ground control device, comprising a communications unit, a flight control unit, a data transmission unit and a radio frequency unit, wherein

• the communications unit is in communication connection with one or more relay stations through a local area network or the Internet;
• the flight control unit is configured to send a control instruction to the data transmission unit;
• and
• the data transmission unit is configured to:
• send the control instruction to an unmanned aerial vehicle by using the radio frequency unit;
• send, when there is a relay station satisfying a preset condition, the control instruction to the unmanned aerial vehicle through the relay station satisfying the preset condition by using the communications unit;
• and receive, by using the radio frequency unit, an image signal sent by the unmanned aerial vehicle;
• wherein the preset condition comprises:
• a switch instruction is received, the switch instruction instructing to forward a control instruction by using a specified relay station.

A relay station, comprising a communications unit, a data transmission unit and a radio frequency unit, wherein

• the communications unit is in communication connection with a ground control device through a local area network or the Internet, and is configured to receive, when the relay station satisfies a preset condition, a control instruction sent by the ground control device;
• and
• the data transmission unit is configured to:
• obtain the control instruction and send the control instruction to an unmanned aerial vehicle by using the radio frequency unit;
• and receive, by using the radio frequency unit, an image signal sent by the unmanned aerial vehicle and forward the image signal to the ground control device by using the communications unit;
• wherein the preset condition comprises:
• a switch instruction is received, the switch instruction instructing to forward a control instruction by using a specified relay station.