System, computer-implemented positioning method, computer program and non-volatile data carrier

Abstract

Each of multiple entities has a respective attached mobile unit that transmits, periodically, a first radio message with identity information of the corresponding entity. At least three base stations receive the first radio message; and based thereon, forward, via a transmission line, the identity information and timing information indicating when the first radio message was received. A central unit communicatively connected to the at least one transmission line receives, via the transmission line, the identity and timing information from the base stations, and based thereon determines a position of the respective entity. Each mobile unit alters an energy density at which the first radio message is transmitted in response to a trigger input being generated depending on a position of the mobile unit relative to a stationary reference. Thus, the energy resources in the mobile units can be economized while attaining a desired positioning accuracy wherever needed.