基于CMONOC的GNSS水汽短时频域特征研究

利用2016年中国大陆构造环境监测网络的GNSS数据开展水汽短时频域特征研究，按气候类型将中国大陆地区划分为5个区域，并在每个区域中随机抽取若干个站点采用快速傅里叶变换方法进行分析，提取不同季节的GNSS水汽周期特征。结果表明，各类站点的水汽频域特征存在明显的区域性变化和季节性差异；高原山地气候、热带季风气候和亚热带季风气候类型的GNSS站点的周期性变化显著；热带季风地区、亚热带季风地区及沿海地区水汽振幅较大，高原山地和温带大陆地区水汽振幅较小。

Short Term Frequency Domain Characteristics of GNSS PWV Based on CMONOC

According to the climate type, the mainland of China is divided into five regions, and a number of sites are randomly sampled from each region for analysis. Based on the fast Fourier transform(FFT) method, we use GNSS data from crustal movement observation network of China(CMONOC) in 2016 for characteristics analysis of PWV in short term frequency domain, and extract GNSS PWV cycle characteristics of different seasons. The results show that the characteristics of PWV frequency domain have obvious regional variation and seasonal difference. There are obvious periodic changes in the GNSS stations of plateau mountain climate, tropical monsoon climate and subtropical monsoon climate. The PWV amplitude is higher in the tropical monsoon, subtropical monsoon and coastal regions, and it is lower in plateau mountainous and temperate continental regions.