摘要: |
提出了一种利用三频观测值修正电离层延迟误差二阶项的方法,可使延迟误差
达到毫米级精度。理论分析表明,影响修正结果达到毫米级的主要因素是总电子含量(TEC
)和G
PS信号传播方向与地磁场方向的临界夹角。取通常情况下TEC的值,在不同频率条件
下,通过解算给出了达到毫米级精度所要求的临界夹角值。研究结果对精密定位过程信号的
接
收提供了参考方法。 |
关键词: 全球定位系统 电离层 延迟误差 三频 二阶项 精确定位 |
DOI: |
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基金项目: |
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Analysis of Second order Angle in Correction of GPS Ionosphere Delay Errors |
ZHANG Cheng-yi,ZHAO Wei,ZHAN Yu,YANG Xing-xing |
(College of Mathematics and Physics,Nanjing University of Information Science an
d Technology,Nanjing 210044,China)) |
Abstract: |
Utilizing triple-frequency observation value to co
rrect secondorder of ionosphere delay errors is proposed in this paper.With th
is method th
e delay errors can reach millimeter-scale accuracy. Theoretical analysis shows t
h
at the total electron content(TEC) and the critical angle between the direction
of GPS propagation and geomagnetic field are main factors influencing the corre
ction result to millimeterscale.Through selecting the value of TEC and diff
erent frequencies, the angles required by the correction result reaching millime
ter
scale accuracy are figured ou
t under normal conditions. The algorithm proposed can be seen as a reference for
accurate positioning of GPS. |
Key words: ionosphere delay errors triple frequency second order accurate positioning |