System, communication device, program, and control method

A communication device arranged on ground, comprising:

• a wireless communication unit configured to be capable of establishing a wireless communication link with a first flying object and a second flying object;
• and
• a control unit configured to control the wireless communication unit to, when replacing the first flying object which has established a wireless communication link using a first circularly polarized wave with the second flying object, receive the first circularly polarized wave transmitted by the first flying object and a second circularly polarized wave transmitted by the second flying object, which is opposite to the first circularly polarized wave, to acquire information from the first flying object and information from the second flying object, and cut the wireless communication link with the first flying object after establishing a wireless communication link with the second flying object.

A communication device mounted on a flying object, comprising:

• a wireless communication unit configured to wirelessly communicate with a ground communication device arranged on ground;
• and
• a communication control unit configured to cause the wireless communication unit to make a switch between double-polarized communication which uses a right-handed circularly polarized wave and a left-handed circularly polarized wave and single-polarized communication which uses the right-handed circularly polarized wave or the left-handed circularly polarized wave, according to a predetermined condition.

A control method executed by a computer arranged on ground, comprising:

• controlling to, when replacing a first flying object which has established a wireless communication link using a first circularly polarized wave with a second flying object, receive the first circularly polarized wave transmitted by the first flying object and a second circularly polarized wave transmitted by the second flying object, which is opposite to the first circularly polarized wave, to acquire information from the first flying object and information from the second flying object, and cut the wireless communication link with the first flying object after establishing a wireless communication link with the second flying object.

A control method executed by a computer mounted on a flying object, comprising:

• controlling to cause a wireless communication system for wirelessly communicating with a ground communication device arranged on ground to be switched between double-polarized communication which uses a right-handed circularly polarized wave and a left-handed circularly polarized wave and single-polarized communication which uses the right-handed circularly polarized wave or the left-handed circularly polarized wave, according to a predetermined condition.