摘要
GPS和GLONASS存在系统差异,组合定位时,采用方差分量估计可得到更加准确的结果。由于Helmert方差分量估计算法效率较低,难以满足动态定位的需要。因此,GPS/GLONASS组合定位时要求对两类观测值先验定权。GDOP是GPS单系统定位中的精度指标。提出基于加权GDOP公式得到GPS观测数据的GDOP阈值自适应确定两类观测值的权比值,并用实测数据验证其可行性。
More accurate positioning results would be contained ifl GPS/GLONASS com bined system by using Helmert variance component estimation since its systemic differences. However, Helmert variance component estimation leads larger time and space complexity be cause of its iteration method, which conduces inefficient algorithm and makes it hard for dy namic locating. GDOP is identified as a positioning precision index of GPS. In integrated po sitioning, GDOP, joined the weight-matrix, can be the representation of the positioning pre cision. Brings forward the new formula of GDOP, which is intended for compute the thresh old of the GPS observation using actual data and determine the weight of the two kinds of ob servations.
出处
《全球定位系统》
2013年第3期39-42,共4页
Gnss World of China
基金
湖南省国土资源厅科技项目(批准号:2012-41)
中南大学前沿研究计划(批准号:2009QIID002)
关键词
GDOP
权比
组合定位
GDOP
weight matrix
integrated positioning
