Acta Geodaetica et Cartographica Sinica >

2016 , Vol. 45 >Issue 8: 919 - 928

DOI: https://doi.org/10.11947/j.AGCS.2016.20150554

Accuracy Evaluation of GPS Broadcast Inter-signal Correction (ISC) Parameters and Their Impacts on GPS Standard Positioning

  • WANG Ningbo ,
  • YUAN Yunbin ,
  • ZHANG Baocheng ,
  • LI Zishen
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  • 1. State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;
    2. Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2015-11-17

  Revised date: 2016-06-07

  Online published: 2016-08-31

Supported by

The National Natural Science Foundation of China (Nos.41231064;41304034;41574033;41321063);The Beijing Natural Science Foundation (No. 4144094)

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Abstract

With the introducing of GPS (Global Positioning System) Block ⅡR-M satellites in 2005, a new civil signal (L2C) was transmitted on L2 frequency, and two new signals (L5I and L5Q) on a new frequency (L5) were also introduced as standard signals with Block ⅡF satellites beginning in 2010. In addition to the timing group delay (TGD) parameter contained in the legacy navigation (LNAV) message, four additional inter-signal correction (ISC) parameters are introduced in the new civil navigation (CNAV) message to provide corrections for L1C/A, L2C and L5 signals with respect to L1P(Y) signal. In this study, the ISC correction models are first developed for GPS single-and dual-frequency navigation users. Thereafter ISCs are validated with the differential code bias (DCB) products of different organizations, and several standard point positioning (SPP) schemes are also carried out to analyze the impact of ISCs on GPS standard positioning. The results indicate that the precision of broadcast ISCC/A is about 0.2 ns, and those of TGD, ISCL2C and ISCL5Q are about 0.5 ns. The positioning accuracy of the SPP solution based on GPS L2C signals applying ISC corrections improves 30.6% and that based on L1C/A and L2C ionosphere-free combination improves 12.2% at 12 multi-GNSS experiment (MGEX) stations during day of year (DOY) 300-310 in 2014, compared to the solutions without the consideration of ISCs. For GPS dual-frequency users, the broadcast ISCs enable a level of accuracy that is competitive with ionosphere-free combination of the present L1P(Y) and L2P(Y) signals.

Key words： inter-signal correction (ISC); timing group delay (TGD); differential code bias (DCB); standard positioning

Cite this article

WANG Ningbo , YUAN Yunbin , ZHANG Baocheng , LI Zishen . Accuracy Evaluation of GPS Broadcast Inter-signal Correction (ISC) Parameters and Their Impacts on GPS Standard Positioning[J]. Acta Geodaetica et Cartographica Sinica, 2016 , 45(8) : 919 -928 . DOI: 10.11947/j.AGCS.2016.20150554

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