Patent ID: 8855910

Claim:
A moving body anti-collision device that is provided on a moving body and transmits signals to or receives signals from another moving body, comprising: a transmission unit that transmits a first detection wave; a driving unit that is connected to the transmission unit and generates a driving signal to drive the transmission unit; a first receiving unit that receives a second detection wave sent from a transmission unit provided on the other moving body; a calculation unit that calculates a position of the moving body relative to the other moving body based on an intensity of the second detection wave received by the first receiving unit, information included in the second detection wave indicating the transmission intensity of the second detection wave, and an intensity-distance curve, wherein, in the intensity-distance curve, the intensity of the second detection wave decreases as a propagation distance increases; and a collision determining unit that determines, based on a calculation result given by the calculating unit, whether the moving body collides with the other moving body, wherein transmission intensity of the second detection wave is set in the other moving body based on a speed at which the other moving body travels.