Based on coordinates differential modes, using Portable GPS Receiver by near\|real time process, the positioning precision is about ±5 m. It can be used in forest to do many positioning. Position test to be done ...Based on coordinates differential modes, using Portable GPS Receiver by near\|real time process, the positioning precision is about ±5 m. It can be used in forest to do many positioning. Position test to be done under crown measuring more than 4 satellites by synchronous measure, positioning precision is less than ±5 m. When measure time is more than 20 minutes. In addition, why differential\|positioning precision is better has been analyzed.展开更多
研究了在进行GPS静态绝对定位时,误差经过多长时间会稳定在一个较小的范围内.在研究过程中,先是使用手持GPS接收机分4天对某一特征点采取静态绝对定位的方法来获取实验数据,每天的定位时间为1 h,都是从上午10:00到11:00,每隔1 m in,记...研究了在进行GPS静态绝对定位时,误差经过多长时间会稳定在一个较小的范围内.在研究过程中,先是使用手持GPS接收机分4天对某一特征点采取静态绝对定位的方法来获取实验数据,每天的定位时间为1 h,都是从上午10:00到11:00,每隔1 m in,记录一次观测值,4天一共获得4组特征点的坐标.然后通过对每组坐标值求均值和标准差的方法处理数据.在对处理结果进行比较和分析后,得出随着观测时间的延长,观测值会变得更加精确,经过20 m in左右的时间,经度坐标的误差会稳定在一个较小的范围内;经过27 m in左右的时间,纬度坐标的误差会稳定在一个较小的范围内.展开更多
文摘Based on coordinates differential modes, using Portable GPS Receiver by near\|real time process, the positioning precision is about ±5 m. It can be used in forest to do many positioning. Position test to be done under crown measuring more than 4 satellites by synchronous measure, positioning precision is less than ±5 m. When measure time is more than 20 minutes. In addition, why differential\|positioning precision is better has been analyzed.
文摘研究了在进行GPS静态绝对定位时,误差经过多长时间会稳定在一个较小的范围内.在研究过程中,先是使用手持GPS接收机分4天对某一特征点采取静态绝对定位的方法来获取实验数据,每天的定位时间为1 h,都是从上午10:00到11:00,每隔1 m in,记录一次观测值,4天一共获得4组特征点的坐标.然后通过对每组坐标值求均值和标准差的方法处理数据.在对处理结果进行比较和分析后,得出随着观测时间的延长,观测值会变得更加精确,经过20 m in左右的时间,经度坐标的误差会稳定在一个较小的范围内;经过27 m in左右的时间,纬度坐标的误差会稳定在一个较小的范围内.
