附加电离层延迟约束的实时动态PPP快速重新初始化方法

被引:10
作者
丁文武 [1 ,2 ]
欧吉坤 [1 ,2 ]
李子申 [3 ]
袁运斌 [1 ,2 ]
机构
[1] 中国科学院测量与地球物理研究所
[2] 大地测量与地球动力学国家重点实验室
[3] 中国科学院光电研究院
关键词
实时动态PPP; 重新初始化; 周跳修复; 电离层TEC预报; 太阳活动; 历元间差分;
D O I
暂无
中图分类号
P228.4 [全球定位系统(GPS)];
学科分类号
081105 ; 0818 ; 081802 ;
摘要
传统模式下,由于卫星信号中断等原因导致的实时动态PPP重新初始化问题将严重影响PPP的实际应用效果.针对上述问题,本文提出了一种有效的解决思路,首先设计了电离层延迟变化预报模型,并提出预报信息的定权方法,进而将上述预报结果作为虚拟观测值,联合历元间/星间差分观测数据估计得到周跳参数浮点解,并尝试固定,从而实现PPP快速重新初始化.该方法通过实现电离层预报结果权重的自适应确定,改善了参数估计结果的精度,提高了周跳修复成功率及可靠性.利用不同区域和不同时期的大量观测数据分析表明,周跳修复效果与测站位置、太阳活动及中断时长存在密切关系,当中断时间较短(90 s以内)时,均可以获得较高的成功率,平均达到90%以上,由此验证了本方法的有效性;随着中断时长进一步增大,不同地区和太阳活动情形下的修复效果存在显著差异,纬度越低,太阳活动越剧烈,成功率越低.
引用
收藏
页码:1720 / 1731
页数:12
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