本文關(guān)鍵詞： BDS 星內(nèi)多徑 分段線性模型 天底角 小數(shù)周偏差 風(fēng)云三號(hào)C星　出處：《測(cè)繪學(xué)報(bào)》2017年08期 　論文類型：期刊論文

【摘要】：針對(duì)BDS衛(wèi)星的偽距星內(nèi)多徑(SIMP)問(wèn)題,提出和強(qiáng)調(diào)了在進(jìn)行SIMP建模時(shí)應(yīng)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(jī)。收集全球分布的iGMAS和MGEX監(jiān)測(cè)站數(shù)據(jù),以天底角為自變量構(gòu)建了北斗IGSO和MEO兩類衛(wèi)星B1、B2和B3頻點(diǎn)的SIMP分段線性模型。利用FY3C星載北斗數(shù)據(jù)對(duì)北斗GEO、IGSO和MEO的SIMP作進(jìn)一步分析。結(jié)果表明,當(dāng)天底角小于7°時(shí),GEO和IGSO衛(wèi)星的SIMP非常接近,對(duì)B2頻點(diǎn)尤其明顯。這也許預(yù)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(shí)還發(fā)現(xiàn)在天底角小于12°(MEO)和7°(IGSO)時(shí),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(chǔ)上,采用MGEX全球監(jiān)測(cè)網(wǎng)數(shù)據(jù)進(jìn)行寬巷小數(shù)周偏差(FCB)解算試驗(yàn),結(jié)果表明,經(jīng)過(guò)SIMP改正后,各顆衛(wèi)星的星端寬巷FCB序列的重復(fù)性都有顯著提高,改進(jìn)幅度都超過(guò)了60%。具體的,IGSO和MEO的星端FCB重復(fù)精度小于0.05周;采用IGSO衛(wèi)星的SIMP模型對(duì)GEO衛(wèi)星進(jìn)行改正后,C01和C02星的FCB重復(fù)精度分別達(dá)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(xué)地理空間信息學(xué)院;地理信息工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;西安測(cè)繪研究所;
【基金】：國(guó)家自然科學(xué)基金(41574013) 大地測(cè)量與地球動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金(SKLGED2014-3-4-E)~~
【分類號(hào)】：TN967.1
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本文編號(hào)：1497877