本文關鍵詞： BDS 星內(nèi)多徑 分段線性模型 天底角 小數(shù)周偏差 風云三號C星　出處：《測繪學報》2017年08期 　論文類型：期刊論文

【摘要】：針對BDS衛(wèi)星的偽距星內(nèi)多徑(SIMP)問題,提出和強調(diào)了在進行SIMP建模時應該采用天底角而非高度角作為自變量,這樣獲得的模型才能用于不同高程的接收機。收集全球分布的iGMAS和MGEX監(jiān)測站數(shù)據(jù),以天底角為自變量構建了北斗IGSO和MEO兩類衛(wèi)星B1、B2和B3頻點的SIMP分段線性模型。利用FY3C星載北斗數(shù)據(jù)對北斗GEO、IGSO和MEO的SIMP作進一步分析。結(jié)果表明,當天底角小于7°時,GEO和IGSO衛(wèi)星的SIMP非常接近,對B2頻點尤其明顯。這也許預示著可以將地面數(shù)據(jù)獲得的IGSO衛(wèi)星的SIMP模型用于GEO衛(wèi)星。同時還發(fā)現(xiàn)在天底角小于12°(MEO)和7°(IGSO)時,所得到的SIMP估值與地面數(shù)據(jù)獲得的模型有非常好的一致性。在此基礎上,采用MGEX全球監(jiān)測網(wǎng)數(shù)據(jù)進行寬巷小數(shù)周偏差(FCB)解算試驗,結(jié)果表明,經(jīng)過SIMP改正后,各顆衛(wèi)星的星端寬巷FCB序列的重復性都有顯著提高,改進幅度都超過了60%。具體的,IGSO和MEO的星端FCB重復精度小于0.05周;采用IGSO衛(wèi)星的SIMP模型對GEO衛(wèi)星進行改正后,C01和C02星的FCB重復精度分別達到0.023和0.068周。
[Abstract]:In order to solve the problem of multipath in BDS satellite, this paper puts forward and emphasizes that the angle of sky and base rather than the angle of altitude should be used as independent variable in SIMP modeling. So that the model can be used in receivers with different heights. Data from globally distributed iGMAS and MGEX monitoring stations are collected. The SIMP piecewise linear model of Beidou IGSO and MEO satellite B1B2 and B3 frequency points is constructed with the angle of sky as independent variable. The SIMP of Beidou Geogso and MEO are further analyzed by using the FY3C spaceborne Beidou data. The results show that, When the bottom angle of the day is less than 7 擄, the SIMP of the IGSO satellite is very close, especially for B2 frequency. This may indicate that the SIMP model of the IGSO satellite obtained from the ground data can be used for the GEO satellite. It is also found that when the base angle is less than 12 擄and 7 擄, it is also found that, The obtained SIMP estimation is in good agreement with the model obtained from the ground data. On this basis, the MGEX global monitoring network data are used to calculate the wide lane decimal week deviation. The results show that, after the correction of SIMP, The reproducibility of satellite wide lane FCB sequence of each satellite is improved significantly, and the improvement range is more than 60. The precision of FCB repeat of specific satellite and MEO is less than 0. 05 weeks. The FCB repetition accuracy of C01 and C02 is 0.023 and 0.068 weeks respectively after the GEO satellite is corrected by using the SIMP model of IGSO satellite.
【作者單位】： 信息工程大學地理空間信息學院;地理信息工程國家重點實驗室;西安測繪研究所;
【基金】：國家自然科學基金(41574013) 大地測量與地球動力學國家重點實驗室開放基金(SKLGED2014-3-4-E)~~
【分類號】：TN967.1
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本文編號：1497877