Abstract: [Problems to be Solved] To provide a flight vehicle and a communication system which can relay communications between transmission and reception antennae that are located farther from each other by using antennae capable of receiving information transmitted from a transmission antenna located in a wider range than a range of a linear directed antenna can receive. [Solution] A flight vehicle 1 according to the present invention comprises one or more linear array antennae (antennae 4); and a controller 2 configured to be capable to execute: a process of receiving information by one or more of the antennae 4, a process of outwardly transmitting said information by one or more of the antennae 4. In the communication system C of the present invention, which includes said flight vehicle 1, the transmission antenna T1 and the reception antenna R1 differ from each other.

Abstract: A radar device capable of detecting a location of an object using a phased-array antenna capable of receiving a reflected wave from all directions includes one or more linear array antennae and a controller capable of transmitting of a wave T from one or more linear array antennae, and receiving a reflected wave R at the one or more linear array antennae. At least one linear array antennae is the same and/or is different from a linear array antenna that transmits the transmitting wave T, and the reflected wave R being generated by the transmitting wave T illuminating the object. A location of the object is estimated using time from transmission of transmitting wave T to reception of reflected wave R, and a direction of the transmitting wave and/or using a frequency of the transmitting wave and a frequency of the reflected wave, and the direction of the transmitting wave.