基于GNSS的川藏高原电离层活动特性分析

Analysis of matching characteristics of agricultural water and soil resources based on GIS

研究川藏高原地区的电离层活动特性,能够为本地区提供高精度导航定位和授时服务。本文基于欧洲轨道确定中心(CODE)2014—2019年的全球电离层格网(GIM)总电子含量(TEC)数据和太阳参数F 10.7的修正指数F 10.7p,利用时间序列分析、相关性分析以及快速傅里叶分析的方法,对川藏高原地区的电离层时空特性进行分析。实验结果表明:(1)川藏高原不同季节的TEC存在差异,尤其是在太阳活动高年时,体现了TEC的年度异常、半年度异常和冬季异常。(2)川藏高原的TEC主要周期表现为26.4、121.7、182.6、219.1、365.0 d,体现了TEC的27 d周期变化,半年变化,年变化。(3)受赤道异常影响,低纬度地区(30°N以下)的TEC较大。TEC在08:00:00—20:00:00相对较大,在20:00:00—08:00:00较小,这一特征在各经度处相同。

Studying the ionospheric activity characteristics of the Sichuan-Tibet Plateau can provide high-precision navigation,positioning and timing(PNT)services for the region.Based on the GIM TEC data of the CODE Analysis Center from 2014 to 2019 and the correction index F 10.7p of the solar parameter F 10.7.This paper used time series analysis,correlation analysis and fast Fourier analysis methods to analyze the ionization of the Sichuan-Tibet Plateau region and the layer spatiotemporal characteristics were analyzed.The experimental results showed that:(1)The TEC on the Sichuan-Tibet Plateau was significantly affected by solar activity,with a correlation coefficient of 0.84.(2)There were differences in the TEC in different seasons in the Sichuan-Tibet Plateau,especially in the high solar activity years,reflecting the annual,semi-annual and winter anomalies of the TEC.(3)The main cycles of TEC in the Sichuan-Tibet Plateau were 26.4,121.7,182.6,219.1,and 365.0 d,reflecting the 27 d,semi-annual and annual changes of TEC.(4)It was affected by the equatorial anomaly,and the TEC at low latitudes(below 30°N)is larger.The TEC was relatively large from 08:00:00—20:00:00 and small from 20:00:00—08:00:00,and this characteristic was the same at all longitudes.