摘要
针对地表质量负荷对京津地区GNSS坐标时间序列噪声特性的影响,选取中国大陆构造环境监测网络8个GNSS基准站2012—2014年的坐标时间序列,利用CATS软件计算大气压、非潮汐海洋、积雪和土壤湿度等质量负载改正前后GNSS坐标时间序列的谱指数、最优噪声模型、速度的变化。发现地表质量负载对GNSS坐标时间序列的噪声特性产生了明显影响。结果显示,京津地区GNSS坐标序列包含白噪声和有色噪声,且最优噪声模型具有多样性。扣除质量负载后N、U分量的噪声模型变化明显,主要表现为FN+WN和PL+WN,而N、E分量的谱指数分别趋近于FN和WN。质量负载改正后基准站U方向的线性速度变化较大,且北京地区变化量大于天津地区。研究结果为提高GNSS数据解算精度、精细分析地壳形变提供参考。
Aiming at the influence of the surface mass loading to GNSS coordinate time series in Beijing-Tianjin region,the 2012-2014coordinate time series of 8GNSS fiducial stations from Crustal Movement Observation Network of China in Beijing-Tianjin region were selected.The spectrum indexes,optimal noise models and velocities of GNSS coordinate time series were calculated by using CATS software before and after deducting the mass loading of atmospheric pressure,nontidal oceanic,snow and soil moisture.It was found that the surface mass loading influenced the noise characteristics of GNSS coordinate time series obviously.The results indicated that in Beijing-Tianjin region GNSS coordinate series contained white noise and color noise,and the optimal noise models of each component were diversity.After deducting the mass loading,the changes of the noise models in components of N and U were obvious,and mainly for FN+WN and PL+WN.The spectrum indexes of Nand Econverged to FN and WN respectively.After deducting the mass loading,the linear velocities in the U direction of the fiducial stations changed obviously,and the variations in Beijing were larger than those in Tianjin.The research results provided reference for improving the accuracy of GNSS data calculation and finely analyzing the crustal deformation.
作者
侯争
郭增长
杜久升
黄晓东
康育鹏
HOU Zheng;GUO Zengzhang;DU Jiusheng;HUANG Xiaodong;KANG Yupeng(Henan Polytechnic University,Jiaozuo,Henan 454001,China;Henan College of Surveying and Mapping,Zhengzhou 451464,China)
出处
《测绘科学》
CSCD
北大核心
2019年第12期67-71,94,共6页
Science of Surveying and Mapping
基金
国家自然科学基金项目（41774041）
教育部人文社会科学青年基金项目（17YJCZH041）
煤炭工业协会科学技术研究指导性计划项目（MTKJ2016-212）
河南省自然科学基金项目（182300410111,182300410115）
关键词
白噪声
地表质量负载
极大似然估计
谱指数
最优噪声模型
white noise
surface mass loading
maximum likelihood estimation
spectral index
optimal noise model
