Tree position plays an important role in research on forest resources and ecological functions, and quickly and accurately obtaining tree position data has long been the focus of investigators. However, the classical method is time-consuming and laborious; thus, a convenient method of measuring tree position is needed. The primary achievements of this study include the following: (1) a device was designed for precise location of trees; (2) a new location algorithm was proposed for pentagonal localization based on the received signal strength indication and ultrawideband technology; and (3) a PC software application was developed for automatically storing and uploading tree position data. The device was applied to 10 circular plots with a diameter of 24 m to test the positioning speed and accuracy. The results showed that the tree positions could be accurately estimated. On the - and -axes, the biases were -3.94 and 3.36 cm, respectively, and the root mean square errors (RMSEs) were 28.39 and 28.53 cm, respectively. The mean error (Ed) between the estimated and reference distances was 36.13 cm, and the standard deviation was 16.67 cm. The device is inexpensive and easy to use and carry in the field; thus, it is suitable for locating trees in environments with complex terrain.

中文翻译：

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一种利用超宽带技术定位树位的方法

树位在森林资源和生态功能研究中占有重要地位，如何快速准确地获取树位数据一直是研究人员关注的焦点。但是，经典方法费时费力；因此，需要一种方便的测量树木位置的方法。本研究的主要成果包括：（1）设计了一种树木精确定位装置；(2)提出了一种基于接收信号强度指示和超宽带技术的五边形定位新定位算法；(3) 开发了PC 软件应用程序，用于自动存储和上传树木位置数据。该装置应用于10个直径为24 m的圆形地块，以测试定位速度和精度。结果表明，可以准确地估计树木的位置。在-和-轴，偏差分别为 -3.94 和 3.36 厘米，均方根误差 (RMSE) 分别为 28.39 和 28.53 厘米。估计距离和参考距离之间的平均误差 (Ed) 为 36.13 厘米，标准偏差为 16.67 厘米。该装置价格低廉，易于在现场使用和携带；因此，它适用于在地形复杂的环境中定位树木。