电离层周日变化对解算GPS硬件延迟稳定性的影响  

Influence of Ionospheric Diurnal Variation on the Estimated GPS Differential Code Bias

作　　者：李灵樨 张东和[1] 郝永强[1] 萧佐[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《空间科学学报》2015年第2期143-151,共9页Chinese Journal of Space Science

基　　金：国家自然科学基金项目(41274156;41174134);国家重大基础研究项目(2011CB811405)共同资助

摘　　要：针对电离层周日变化特征分析了其可能对SCORE方法估算的硬件延迟稳定性的影响.利用BJFS以及XIAM台站的GPS观测数据,解算了位于太阳活动高年(2001年)和太阳活动低年(2009年)的卫星硬件延迟并分析了估算的硬件延迟的稳定性.研究发现,电离层周日变化对估算的硬件延迟稳定性具有一定影响,但是利用不同台站所得到的卫星硬件延迟稳定性在昼夜不同时间上的解算结果存在一定差异.电离层周日变化对利用BJFS台站数据解算的硬件延迟稳定性日夜差异较为明显,在太阳活动高年利用ⅪAM台站数据解算的硬件延迟日夜稳定性差异不很明显,由于XIAM台站处于电离层赤道异常峰附近,夜间电离层变化很大,因此对比中纬度地区,电离层周日变化对赤道异常峰附近地区硬件延迟稳定性解算结果的影响相对较小,但在太阳活动低年,其影响仍较为显著.The condition of smooth temporal and spatial change of ionosphere should be demanded in all the methods to estimate the GPS Differential Code Bias(DCB) from GPS observation.Nevertheless,because the ionosphere usually exhibits variation to different degrees,this condition is just an approximation.Therefore,it can be indicated that the stability of GPS DCB estimated from GPS observation is affected by the ionospheric status.With SCORE DCB estimation method and GPS data obtained at BJFS(middle latitude) and XIAM(low latitude) stations in 2001 and 2009,the satellites DCBs are estimated respectively.Especially,the influence of ionospheric diurnal variation on the DCB stability is verified.It is found that the condition of the ionospheric diurnal variation affects the stability of satellites DCBs estimated from GPS observations,and the satellite DCBs estimated from nighttime GPS data are more stable than that from daytime data.The stabilities of estimated DCBs from BJFS data in 2001 and 2009,and those from XIAM data in 2009 exhibit heavy dependence on local time,but the difference is not obvious for the DCBs estimated from XIAM data in 2001.XIAM station is located near the equatorial ionospheric anomaly,and the ionosphere of this region exhibits notable variations even in the nighttime in solar maximum phase.This may be the reason for the weak dependence of estimated DCBs on local time.

关 键 词：GPS 电离层 电离层总电子含量 硬件延迟 

分 类 号：P228.4[天文地球—大地测量学与测量工程] P352[天文地球—测绘科学与技术]