GIM和不同约束条件相结合的BDS差分码偏差估计

发布时间：2018-01-11 03:27

  本文关键词：GIM和不同约束条件相结合的BDS差分码偏差估计　出处：《测绘学报》2017年02期 　论文类型：期刊论文

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【摘要】：现阶段BDS卫星和地面跟踪站数量较少,用BDS单系统获取的DCB精度有限,针对此问题,本文基于CODE GIM,采用两种不同的"零均值"基准约束方案(分别称为约束1和约束2),选取2015年(DOY002-090)MGEX的BDS数据,求解BDS的DCB,并对其进行精度评估。结果表明,两种约束方案下,卫星DCB差值整体趋势一致,DCBC2I-C7I、DCBC2I-C6I的系统性偏差分别约为-3.3ns和1.2ns,接收机DCB的系统性偏差与卫星DCB大小相同,符号相反。相对于约束1,施加约束2后,IGSO和MEO卫星DCB估值更加稳定(DCBC2I-C7ISTD最大改善21%,DCBC2I-C6ISTD最大改善13%),IGSO和MEO卫星的稳定性(分别在0.1ns和0.2ns左右)优于GEO卫星(0.150.32ns)。约束2的DCB估值效果不仅与CAS/DLR产品有较好的一致性(Bias:-0.40.2ns),而且顾及了BDS卫星DCB间的稳定性差异。两种约束方案下,BDS接收机DCB的STD无明显变化,说明约束的选择对BDS接收机DCB的稳定性无明显影响。BDS接收机DCB稳定性整体上优于1ns,中高纬度区域较好(STD 0.4ns左右),低纬度区域稍差(STD 0.81ns)。
[Abstract]:At present, the number of BDS satellites and ground tracking stations is relatively small, and the precision of DCB obtained by BDS single system is limited. In order to solve this problem, this paper bases on CODE GIM. Using two different "zero mean" benchmark constraint schemes (called constraint 1 and constraint 2), the BDS data of MGEX on 2015 are selected. The results show that the overall trend of satellite DCB difference is consistent with that of DCBC2I-C7I. The systematic deviation of DCBC2I-C6I is about -3.3ns and 1.2ns, respectively. The systematic deviation of receiver DCB is the same as that of satellite DCB, and the symbol is opposite. After constraint 2, the estimation of IGSO and MEO satellite DCB is more stable than that of DCBC2I-C7ISTD. The maximum improvement of DCBC2I-C6ISTD is 13.1). The stability of IGSO and MEO satellites (about 0.1ns and 0.2ns respectively) is better than that of GEO satellites (0.150.32ns). The DCB valuation effect of constraint 2 is not only consistent with that of the CAS/DLR product (Bias: -0.40.2ns). The stability difference of BDS satellite DCB is taken into account, and there is no obvious change in STD of DCB receiver under two constrained schemes. It shows that the choice of constraints has no obvious effect on the stability of BDS receiver DCB. The overall stability of DCB receiver is better than that of 1ns, and the mid-high latitude region is better than that of BDS receiver DCB 0.4ns). The lower latitudes are slightly different from STD 0.81nsm.
【作者单位】： 武汉大学测绘学院;武汉大学地球空间环境与大地测量教育部重点实验室;地球空间信息技术协同创新中心;武汉大学中国南极测绘研究中心;
【基金】：国家重点研发计划(2016YFB0501803) 国家自然科学基金(41574028) 湖北省杰出青年科学基金(2015CFA036)~~
【分类号】：P228.4;TN967.1
【正文快照】： 年(DOY002-090)MGEX的BDS数据,求解BDS的DCB,并对其进行精度评估。结果表明,两种约束方案下,卫星DCB差值整体趋势一致,DCBC2I-C7I、DCBC2I-C6I的系统性偏差分别约为-3.3ns和1.2ns,接收机DCB的系统性偏差与卫星DCB大小相同,符号相反。相对于约束1,施加约束2后,IGSO和MEO卫星DCB，

本文编号：1407960