Comparing the precision and accuracy of GPS positioning in forested areas
Comparing the precision and accuracy of GPS positioning in forested areas
复制标题
森林地区GPS定位精度与准确度对比
DOI：
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发表时间：
2003
影响因子：
1.5
通讯作者：
H. Hasegawa
中科院分区：
文献类型：
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作者：
T. Yoshimura;H. Hasegawa
本研究的目的是澄清全球定位系统（GPS）在森林地区选择性有效度（SA）关闭后的性能。在本研究中，我们对森林地区不同地点GPS定位的水平和垂直定位误差进行了现场测试。计算并比较了GPS在不同位置的定位精度和精度。利用方差分析（ANOVA）分析了差分GPS （DGPS）对精度和精度的影响，并讨论了关闭SA后差分GPS的必要性。结果表明，人工林水平精度误差最大，天然林次之，林道次之。另一方面，在没有障碍物的着陆点，精度误差最小。采用DGPS可大大改善水平精度误差。人工林、林道和天然林的垂直精度误差较大，而着陆处的垂直精度误差较小。着陆时的垂直精度误差也相对较小。综上所述，树冠对精度误差影响较大，DGPS提高的不是水平精度，而是水平精度。在允许水平定位误差不超过10米的情况下，自主GPS是非常有用的。但是，DGPS应该用于测绘，因为测绘需要更高的精度。
The objective of this study is to clarify the performance of the Global Positioning System (GPS) in forested areas after selective availability (SA) was turned off. In this study, we conducted a field test on horizontal and vertical positional errors of GPS positioning at different points in forested areas. The precision and accuracy of GPS positioning at different points were then calculated and compared. Furthermore, the effect of differential GPS (DGPS) on precision and accuracy was analyzed using analysis of variance (ANOVA), and the necessity for DGPS after SA was turned off was discussed. As a result, the largest horizontal precision errors were found to be in the plantation forest, followed by the natural forest and forest road. On the other hand, precision errors were smallest at the landing, around which there were no obstacles. Horizontal accuracy errors were greatly improved by using the DGPS. Large vertical precision errors were produced in the plantation forest, on the forest road, and in the natural forest, while those at the landing were much smaller. Vertical accuracy errors were also relatively small at the landing. In conclusion, tree canopies greatly affected precision errors, and the DGPS improved not horizontal precision but horizontal accuracy. The autonomous GPS is sufficiently useful for purposes in which horizontal positional errors of a maximum of 10 m are allowable. However, the DGPS should be used for surveying and mapping, for which higher accuracy is necessary.