摘要
分别以GPS单系统和融合BDS,GPS,GLONASS三系统两种方案,采用载波相位平滑伪距观测值和球谐函数,构建了全球电离层延迟模型并进行了对比和分析.本文以GPS单系统和融合三系统两种方法反演了2014年1月每日电离层变化过程,解算得出了频间偏差的月综合产品,并对结果进行了对比和分析.事实上,三系统融合不仅增加了可观测的卫星数,而且改善了穿刺点的几何分布.分析结果表明,三系统融合反演全球电离层在精度上优于GPS单系统,均有5~10 TECU的提高.计算得到的频间偏差结果显示,GPS优于GIONASS,BDS稳定性则较次之.
The model of ionospheric delay correction is established by only GPS and by fusing BDS,GPS and GLONASS with observations of pseudo distance smoothed by carrier phase and spherical harmonics.And some experiments of the global ionospheric inversion have been done.The variations process of ionospheric is fused daily in January,2014 to obtain monthly comprehensive differential code bias product and did some analysis on the accuracy of the products.The fusion of the three systems not only increases the number of satellites observation but also improves the geometric distribution of the puncture point.The analysis result shows that the accuracy of inversion of global ionospheric of three system fusions is better than GPS system alone,about 5 to 10 increase in TECU.The Precision of monthly comprehensive differential code bias product of GPS is better than GLONASS,while the BDS stability is poor.
出处
《空间科学学报》
CAS
CSCD
北大核心
2015年第3期306-314,共9页
Chinese Journal of Space Science
基金
国家自然科学基金青年基金项目(41404034
41374014)
中国测绘科学研究院基本科研业务费项目(7771405)共同资助
关键词
电离层
球谐函数
频间偏差
Ionosphere
Spherical harmonics
Differential code bias
