Assessment of the configuration accuracy of two UWB local positioning systems, six antennae and 18 Hz vs. eight antennae and 33 Hz, to measure movement patterns in physical education

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Abstract
The use of valid, accurate and reliable systems is decisive for ensuring optimal data collection and correct interpretation of values. Among other factors, it seems that sampling rate and the number of nodes determine data accuracy using LPS. Thus, the aim of this study was to assess and compare the accuracy of two UWB configurations (i.e. UWB6_18HZ: 6 antennae and 18 Hz capacity vs. UWB8_33HZ: 8 antennae and 33 Hz capacity) to measure locomotion on court. A healthy and well-trained former soccer player (age: 38 years, mass: 76.34 kg, height 1.85 m) ran 9 m along the middle line of a volleyball court (n=10, samples= 424). UWB6_18HZ and UWB8_33HZ configurations have shown high accuracy in sport movement patterns monitoring (mean difference between actual measurements and UWB = 0.014±0.03m for UWB6_18HZ and 0.013±0.03m for UWB8_33HZ), although UWB8_33HZ presented higher accuracy (8.99±0.03 m) than UWB6_18HZ (8.94±0.03). Therefore, manufacturers should consider future developments based on sampling rates and number of antennae installed around the court.