BDS卫星星内多径及其对宽巷FCB解算的影响分析

发布时间：2018-02-09 11:58

  本文关键词： BDS 星内多径 分段线性模型 天底角 小数周偏差 风云三号C星　出处：《测绘学报》2017年08期 　论文类型：期刊论文

【摘要】：针对BDS卫星的伪距星内多径(SIMP)问题,提出和强调了在进行SIMP建模时应该采用天底角而非高度角作为自变量,这样获得的模型才能用于不同高程的接收机。收集全球分布的iGMAS和MGEX监测站数据,以天底角为自变量构建了北斗IGSO和MEO两类卫星B1、B2和B3频点的SIMP分段线性模型。利用FY3C星载北斗数据对北斗GEO、IGSO和MEO的SIMP作进一步分析。结果表明,当天底角小于7°时,GEO和IGSO卫星的SIMP非常接近,对B2频点尤其明显。这也许预示着可以将地面数据获得的IGSO卫星的SIMP模型用于GEO卫星。同时还发现在天底角小于12°(MEO)和7°(IGSO)时,所得到的SIMP估值与地面数据获得的模型有非常好的一致性。在此基础上,采用MGEX全球监测网数据进行宽巷小数周偏差(FCB)解算试验,结果表明,经过SIMP改正后,各颗卫星的星端宽巷FCB序列的重复性都有显著提高,改进幅度都超过了60%。具体的,IGSO和MEO的星端FCB重复精度小于0.05周;采用IGSO卫星的SIMP模型对GEO卫星进行改正后,C01和C02星的FCB重复精度分别达到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 掳, 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 掳and 7 掳, 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.
【作者单位】： 信息工程大学地理空间信息学院;地理信息工程国家重点实验室;西安测绘研究所;
【基金】：国家自然科学基金(41574013) 大地测量与地球动力学国家重点实验室开放基金(SKLGED2014-3-4-E)~~
【分类号】：TN967.1
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本文编号：1497877