北斗星上多径对宽巷模糊度解算的影响分析

发布时间：2018-06-05 05:20

本文选题：北斗卫星导航系统 + 星上多径　；参考：《测绘科学技术学报》2017年01期

【摘要】：通过引入北斗星上多径参数,量化了北斗星上多径对宽巷模糊度解算的影响;从理论上分析了该影响量在非差、单差和双差条件下的特性,并采用零基线、短基线和长基线3组实测数据进行了分析与验证。结果表明:星上多径对非差宽巷模糊度估值的影响在三类卫星上表现出不同的特性,在MEO卫星上最大,可达1周;星间单差无法消除星上多径偏差影响,进而PPP宽巷模糊度的解算将受到影响;星上多径不会对零基线双差宽巷模糊度解算造成影响,对短基线双差宽巷模糊度解算的影响也可忽略,但长基线双差宽巷模糊度解算则受严重影响;星上多径会导致长基线双差宽巷模糊度平滑收敛缓慢,经改正后模糊度固定成功率能够显著提高,单历元取整成功率从52.7%提升到61.4%,平滑20个历元模糊度固定成功率即可从68.4%提升到95.5%。
[Abstract]:Through the introduction of the multipath parameters on the Beidou star, the influence of the multipath on the ambiguity resolution of the wide alley is quantified. The characteristics of the effect under the conditions of non difference, single difference and double difference are analyzed theoretically, and the 3 groups of measured data are analyzed and verified with zero baseline, short baseline and long baseline. The effect of paste estimation has different characteristics on the three types of satellites, the maximum of the MEO satellite, up to 1 weeks; the INTERSTAR single difference can not eliminate the influence of the multipath deviation on the star, and then the calculation of the ambiguity resolution of the PPP wide lane will be affected; the multipath on the star will not affect the ambiguity resolution of the zero baseline double difference width lane, and the ambiguity of the short baseline double difference width Lane The effect of the calculation can also be ignored, but the ambiguity resolution of the long baseline double difference wide lane is seriously affected. The multipath on the satellite will lead to the slow convergence of the long baseline double difference width, and the success rate of the fixed fuzzy degree can be greatly improved after the correction. The success rate of the single epoch is raised from 52.7% to 61.4%, and the success rate of the 20 epoch ambiguity is fixed. Can be promoted from 68.4% to 95.5%.
【作者单位】：信息工程大学;地理空间信息国家重点实验室;北京卫星导航中心;
【基金】：国家自然科学基金项目(41020144004A;41374019;41474015) 国家863计划项目(2013AA122501)
【分类号】：P228.4

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