The validity of a local positioning system (LPS) to measure inter-unit distance was investigated during a team sport movement circuit. Eight recreationally active, female indoor team-sport players completed a circuit, comprising seven types of movements (walk, jog, jump, sprint, 45° change of direction and shuffle), on an indoor court. Participants wore a receiver tag (ClearSky T6, Catapult Sports) and seven reflective markers, to allow for a comparison with the reference system (©Vicon Motion Systems, Oxford Metrics, UK). Inter-unit distance was collected for each combination of participants. Validity was assessed via root mean square error, mean bias and percentage of variance accounted for, both as an overall dataset and split into distance bands. The results presented a mean root mean square error of 0.20 ± 0.05 m, and mean bias detected an overestimation for all distance bands. The LPS shows acceptable accuracy for measuring inter-unit distance, opening up opportunities to utilise player tracking for tactical variables indoors.

中文翻译：

---

用于测量单元间距离的弹射ClearSky T6本地定位系统的标准有效性。

在团队运动回路中研究了本地定位系统（LPS）测量单位间距离的有效性。八位具有娱乐活动能力的女性室内团队运动选手在室内球场上完成了一个巡回赛，包括七种类型的动作（步行，慢跑，跳跃，短跑，45度方向改变和随机播放）。参加者佩戴了接收器标签（ClearSky T6，Catapult Sports）和七个反射性标记，以便与参考系统进行比较（©Vicon Motion Systems，英国牛津度量标准）。收集每个参与者组合的单位间距离。通过均方根误差，均值偏差和方差百分比评估有效性，将其作为整体数据集并划分为距离带。结果表明，均方根误差为0.20±0.05 m，平均偏差检测到所有距离带的高估。LPS在测量单位间距离方面显示出可接受的精度，这为利用球员追踪室内战术变量开辟了机会。