Patent ID: 8203347

Claim:
An element determination device for determining a state of a reflection element in a signal generation system which comprises a first signal source and a second signal source which can receive and transmit a signal, a reflection element which can be connected respectively to the first and second signal sources, and realizes a predetermined reflection state, and a transmission element which comprises a first terminal and a second terminal, and has a transmission characteristic for a direction from the first terminal to the second terminal and a transmission characteristic for a direction from the second terminal to the first terminal which are equal to each other, the element determination device comprising: an error factor deriver that derives error factors in the first signal source and the second signal source based on a measurement result of a signal in respective states in which the reflection element is respectively connected to the first signal source and the second signal source, and a measurement result of a signal in a state in which the first terminal and the second terminal of the transmission element are respectively connected to the first signal source and the second signal source; a transmission characteristic deriver that derives a transmission characteristic of the transmission element based on a measurement result of a signal in the state in which the first terminal and the second terminal of the transmission element are respectively connected to the first signal source and the second signal source and the derived error factors; and a reflection element state determiner that determines whether the reflection element realizes the predetermined reflection state by comparing the derived transmission characteristic of the transmission element with a transmission characteristic of the transmission element known before the derivation carried out by the transmission characteristic deriver.