Measurements of Transient Phenomena with Digital Oscilloscopes

In this paper, the effects of sampling upon rise time measurements with a digital oscilloscope are considered. In particular, the use of linear interpolation for estimating signal rise times is discussed, and its effects are analyzed for various step signals. A simple expression is derived, which accurately models the sampling and linear interpolation contributions to the overall rise time measurement error. Using these results, a correction formula is proposed, and its applicability is discussed

TDoA Based Positioning using Ultrasound Signals and Wireless Nodes

In this paper, a positioning technique based on Time Difference of Arrival (TDoA) measurements is analyzed. The proposed approach is designed to consent range and position estimation, using ultrasound transmissions of a stream of chirp pulses, received by a set of wireless nodes. A potential source of inaccuracy introduced by lack of synchronization between transmitting node and receiving nodes is identified and characterized. An algorithm to identify and correct such inaccuracies is presented.Comment: Preprin