Abstract: A control apparatus includes: a determiner configured to determine, for each indicator of a plurality of indicators, whether an event relevant to a change in the respective indicator has occurred, the plurality of indicators relating to an environment in which crops are grown, each indicator of the plurality of indicators being detected by one or more sensors of a plurality of sensors; an identifier configured to identify, based on a result of a determination executed by the determiner, a plurality of target sensors from among the plurality of sensors, a number of the plurality of target sensors being less than a number of the plurality of sensors; and a transmission instructor configured to instruct each target sensor of the plurality of target sensors to transmit a respective detection result.

Abstract: There is provided a multi-antenna measurement method of measuring a device under test having at least two receive antennas and capable of considering the spatial correlation between antennas in a simpler configuration. Two different uncorrelated signal sequences “a” and “b” are generated by the pseudo base transceiver station 4. These signal sequences “a” and “b” are transmitted as radio waves from positions (positions of transmitting antenna elements 31 and 32) of the two base angles of the isosceles triangle toward the device under test 1 provided at a position of the apex angle respectively to measure the received antennas by receive antennas of the device under test 1. This method is easy to calibrate and can consider the spatial correlation between antennas in a simpler configuration.