Abstract: The disclosed subject matter relates to a method and a system for determining a position of a movable agent device in a reflective environment of which a geometric model is known and in which at least one anchor device has a predetermined position, comprising: transmitting a first and a second ultra-wideband pulse signal via a first and a second uni-directional antenna of the anchor device, respectively, and receiving respective received signals via an omni-directional antenna of the agent device; defining a set of candidate positions within said geometric model, and, for each candidate position, calculating a set of multipath components as a function of the geometric model, directivities of the uni-directional antennas and the position of the anchor device; determining a deviation measure between the calculated multipath components and said received signals; and obtaining the position of the agent device as the candidate position with the minimum deviation measure.

Abstract: In a method for determining the flow rate of fluids using the ultrasonic transit time method, the flow speed and therefrom the flow rate of the fluid is determined from the transit time of ultrasound signals through the measurement section. In order to take into account the change in the transmission function of the ultrasonic converters, which change acts as a drift of the measurement variable, the transmission function of the measurement section is determined at least approximately, and at least one ultrasonic transit time is corrected by means of a correction value that is determined from the group transit time of the transmission function.

Abstract: In a method for determining the flow rate of fluids using the ultrasonic transit time method, the flow speed and therefrom the flow rate of the fluid is determined from the transit time of ultrasound signals through the measurement section. In order to take into account the change in the transmission function of the ultrasonic converters, which change acts as a drift of the measurement variable, the transmission function of the measurement section is determined at least approximately, and at least one ultrasonic transit time is corrected by means of a correction value that is determined from the group transit time of the transmission function.

Abstract: A receiver device for detecting a multi-band signal, the receiver device comprising a bank of autocorrelation units adapted for separating the multi-band signal into a set of autocorrelation signals, and a sampling stage arranged downstream the bank of autocorrelation units and adapted for sampling the set of autocorrelation signals to thereby select individual signal components for detection.