摘要
为了进一步评估全球定位系统(GPS)时间序列噪声模型水平和垂直速率的大小,及其对误差的影响,选取中国内地227个GPS连续基准站2010—2020年南北、东西和垂直3个方向的坐标时间序列,采用6种噪声模型或噪声组合模型对其进行噪声分析。结果表明,中国内地GPS坐标时间序列噪声模型存在多样性,且部分站点在不同方向的噪声模型也存在差异,主要以一阶高斯马尔可夫+随机漫步噪声(GGMWN)和闪烁噪声+白噪声(FNWN)为主;在100°E附近的GPS站点噪声特性差异最为显著;噪声模型与速率之间的关系分析表明噪声模型对水平向速率的大小和误差影响较小,在现实计算中可不考虑噪声对水平速度的影响,但对垂向速率的大小和误差影响显著;考虑噪声模型可有效提高垂向速率的精度,同时也可能会改变部分站点的垂向运动方向,所以在现实计算中须考虑噪声对垂向速率的影响。
In order to further evaluate the size of horizontal and vertical velocity in the noise model of GPS time series,and its impact on the error,the paper selected 227 GPS continuous reference stations in the Chinese Mainland from 2010 to 2020 in the north-south,east-west and vertical directions,and conducted noise analysis on coordinate time series in three directions using six noise models or noise combination models.Results showed that the noise models of GPS coordinate time series in Chinese Mainland could be diverse,and the noise models of some stations in different directions be also different,it would be mainly composed of first order Gaussian Markov+random walk noise(GGMWN)and flicker noise+white noise(FNWN);moreover,the noise characteristics of GPS stations near 100°E would illustrate the most significant differences;furthermore,the analysis of the relationship between the noise model and the speed indicated that the noise model would have a relatively small impact on the size and error of the horizontal speed,thus,in practical calculations,the influence of noise on the horizontal speed could be ignored,but it would have a significant impact on the size and error of the vertical speed;in general,considering that the noise model could effectively improve the accuracy of vertical velocity,and it may also change the vertical motion direction of some stations,in practical calculations,the impact of noise on vertical velocity must be considered.
作者
袁兴明
孙玉强
彭正斌
YUAN Xingming;SUN Yuqiang;PENG Zhengbin(Architecture and Information Engineering,Shandong Vocational College of Industry,Zibo,Shandong 256414,China;CCCC Highway Consultants CO.,Ltd.,Beijing 100088,China)
出处
《导航定位学报》
CSCD
北大核心
2024年第2期94-101,共8页
Journal of Navigation and Positioning
