摘要: |
基于削弱实时动态精密单点定位多路径效应的目的,首先分析了多路径误差的产生
原理,利用信噪比与高度角的关系判断多路径产生的来源,利用TEQC软件量化多路径误差的
大小。其次分析了一般导航定位中的设置截止高度角法减少多路径效应在实时动态精密单点
定位中的作用,试验表明这种方法并不适用于精密单点定位。基于Estimate SETC模型和Ion
oFree LC对多路径效应对电离层改正的影响进行了研究,发现当多路径效应显著时,双频
电离层改正会带来更大的误差,不利于精密单点定位的高精度解算。最后根据实际数据解算
结果,在多路径效应显著的情况下,建议选用精确的模型改正消除电离层误差,而不使用双
频消除电离层延迟法。 |
关键词: 全球导航卫星系统 多路径效应 电离层延迟改正 精密单点定
位 |
DOI: |
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基金项目: |
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Mitigation of multipath effects in real-time kinematic precise point positioning |
WAN Sheng-hui,YANG Zun-long,SU Yan |
() |
Abstract: |
This paper investigates mitigating the multipath effect in realtime dynamic
PPP(Precise Point Positioning). First,the generation principle of mu
ltipath errors is analyzed,the source of multipath generation is determined
by using the relationship between elevation angle and SNR(SignaltoNoise Radi
o), the size of multipath error is quantified by using TEQC software. Second,
the role of setting cutoff angle method to reduce multipath
effects in realtime dynamic PPP is discussed,test shows that this method is
not applicable for PPP. By studying th
e impact of the multipath effects on the ionosphere correction based on the Es
timate SETC model and IonoFree LC, it is found that in s
ignificant multipath effects condition, the dualfrequency ionosphere correct
ion will lead to greater error, which is not conducive to a high PPP precision solver. Fin
ally,according actual data solver, in the significant multipath effect cases,the
use of precise model correction is suggested to eliminate the io
nosphere error,instead of using the dualfrequency. |
Key words: GNSS multi path effect space instrument ship precise point positioning |