Measurement of Distance in Multiagent by Acoustic Waves at Different Frequencies

In multiagent systems, each agent as a learner must decide actions by itself. An agent does not get all information in the environment. Distance information between agents is needed for selecting actions, for example, in order to make routing tables. Usually we get information of a wireless signal power from a wireless network card because there is a relationship between the wireless signal power and distance between agents. But some network cards do not provide us a wireless signal power or such information. In this paper, we provide a novel distance measurement method using acoustic wave. A composite wave which consists of a direct wave and reflected waves is not a monotone decreasing because it has ‘nodes’ which amplitude are always almost zero per wavelength. So we can not get distance information from a wave signal power. We propose the distance measurement method with the two ore more sine waves. And experiment shows its implementability.