摘要
目的提高手持式GPS在遮挡条件下定位精度.方法通过建立林区GPS控制网,求解高精度的坐标转换参数,然后采用手持式GPS进行样地中心定位和小班边界定位的实验.结果手持式GPS样地中心定位最大综合误差为3.86 m,小班边界平均位移和中心位置绝对位移分别为3.23 m、3.72 m,小班面积测量精度达到98%以上.结论在实际应用中宜选择5个已知差分基准站求解坐标转换参数;利用此参数可有效提高遮挡条件下手持式GPS的测量精度,且操作简单,实用性强.
In order to improve the positioning accuracy by portable GPS receiver under obstruction conditions, the GPS control network is established under obstruction conditions, such as in the forest where it is difficult for GPS satellite signals to reach the receiver, to find out coordinate conversion parameters with high accuracy, and to carry out the experiment of positioning the centre of sample-plot and the boundary of sub-compartment by portable GPS receiver. By means of portable GPS receiver, the largest RMS error （composite error） of sample-plot centre positioning is 3.86 m ; the average boundary displacement and absolute centre displacement of sub-compartment are 3.23 m and 3.72 m respectively;and the precision of subcompartment area measurement is higher than 98 %. When applying this method, it is suggested to select 5 known differential base stations to find coordinate portable GPS receivers under obstruction conditions ate and practical. conversion parameters. The accuracy of positioning by will be improved effectively, moreover, it＇s easy to operate and practical.
出处
《沈阳建筑大学学报（自然科学版）》
EI
CAS
2007年第2期248-252,共5页
Journal of Shenyang Jianzhu University：Natural Science
基金
科技部平台建设子项目(2005DKA10702)
广西壮族自治区"新世纪十百千人才工程"专项资金(2002218)
广西壮族自治区林业局科学基金(200246)
关键词
林区GPS控制网
手持式GPS
样地中心定位
小班边界定位
遮挡条件
GPS control network in forest
portable GPS receiver
sample-plot centre positioning
sub-compartment boundary positioning
obstruction conditions
