Modeling Multi-lateration Ultrasound Ranging Systems in Biomechanical Gait Analysis

A.M. Sabatini (Italy)


Multilateration ranging systems; Gait biomechanics


In this paper the physically-based simulation of multi lateration ultrasonic (US) ranging systems is performed, to prepare their use for a biomechanical application the ergometric evaluation of gait during treadmill walking. This approach allows to analyze the effects on the measurement performance due to several factors, among them the features of the US transducers, e.g., beamwidth, bandwidth, and signal shape, the number of available receivers, the frame rate, the behavior of the receiver detectors, the properties of the propagation medium. All these factors also have an influence on the parameters of a gait ergometric evaluation, e.g., the mechanical energy of the body Center of Mass (COM) the external work relative to the ground and the efficiency of the pendulum-like transfer between gravitational potential energy and kinetic energy of the COM. By integrating a simple biomechanical model of 3D pelvic movements into the simulation, we get an insight into the part of the intra-subject variability that can be expected as the consequence of the measurement process an issue related to the problem of understanding the measurement reliability.

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