GPS民用广播星历中ISC参数精度分析及其对导航定位的影响

发布时间：2018-02-27 16:43

本文关键词： ISC参数 TGD参数 DCB参数导航定位　出处：《测绘学报》2016年08期 　论文类型：期刊论文

【摘要】：2005年起发射的GPS Block IIR-M卫星在L2频率上新增了L2C民用信号,2010年起发射的Block IIF卫星新增了L5频率及L5I、L5Q两种民用信号。为此,GPS民用广播星历在原有时间群延迟(TGD)参数的基础上,新增了ISC_(C/A)、ISC_(L2C)、ISC_(L5I)及ISC_(L5Q)4种ISC(inter-signal correction)参数,以服务GPS实时导航定位用户。本文给出了ISC参数在GPS单/双频定位中的改正方法、利用不同机构提供的后处理差分码偏差(DCB)产品评估了ISC参数的实际精度、研究了ISC参数对GPS民用导航定位精度的影响。在明确TGD、ISC和DCB 3类参数之间区别与联系的基础上,本文研究表明:GPS广播的ISC_(C/A)参数精度可达0.2ns,TGD、ISCL2C及ISCL5Q参数精度可达0.5ns;以2014年连续11d全球12个MGEX(multi-GNSS experiment)站为例,经由ISC参数改正后,GPS L2C单频标准单点定位(SPP)的位置解精度提高了30.6%,L1C/A+L2C双频SPP的位置解精度提高了12.2%,该精度与L1P(Y)+L2P(Y)消电离层组合SPP的位置解精度相当。
[Abstract]:Since 2005, the GPS Block IIR-M satellite has added L2C civilian signal at L2 frequency, and Block IIF satellite has added L5 frequency and L5IZL5Q signal since 2010. Therefore, the GPS civil broadcast ephemeris is based on the original time group delay. The new ISC-C / A / ISC-L2CU / ISC-L5I and ISC_(L5Q)4 ISC(inter-signal correction parameters are added to serve GPS real-time navigation and positioning of users. In this paper, the correction method of ISC parameters in GPS single / double frequency location is presented. The actual accuracy of ISC parameters is evaluated by using the post-processing differential code deviation (DDCB) products provided by different institutions, and the influence of ISC parameters on the positioning accuracy of GPS civil navigation is studied. The research shows that the precision of ISCL5Q C / A parameters can reach 0.2nsTGDX ISCL2C and 0.5ns.Take 12 MGEX(multi-GNSS experts stations in 2014 for 11 consecutive days as an example, After the correction of ISC parameters, the accuracy of position solution of ISC L2C single frequency standard single point positioning system is improved by 30.6% L1C / A / L 2C dual-frequency SPP, which is equivalent to that of L1PY) L2PNY) SPP.
【作者单位】：中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室;中国科学院大学;中国科学院光电研究院;
【基金】：国家自然科学基金(41231064;41304034;41574033;41321063) 北京市自然科学基金(4144094)~~
【分类号】：P228.4

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