Analytical Study of Static Observation According to IGS Products

 
 
 
  • Abstract
  • Keywords
  • References
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  • Abstract


    There are many factors affecting the observation accuracy that adopt GNSS technique based on the International GNSS Service (IGS). This can be due to several factors occur in observing process, including satellites and stations clocks, atmospheric parameters, earth crust movement that causes annual changes in the earth's points locations including IGS stations, as well as Earth Polar Motion (EPM). This error ranges from a several centimeters to a few meters. To avoid these errors IGS gave many instructions to increase the observations accuracy in order to reach precise positioning measurements.

    The objective of this study is to analyze the IGS products and then make a test by observing some points with (Leica Viva GNSS) device and send them to correction by adopt the instructions of this site, which are classified into four broad categories (Broad Cast, Ultra Rapid Predicted and Observed, Rapid, Final). All of these factors are affected by (observing period, Dilution of precision DOP, the timing of data transmission to the relevant site). The accuracy of the observed coordinates are related to these factors. A solution of this problem may be identifying by comparing the OPUS correction with the ideal IGS products to know the difference.

    Finally, the results of the maximum observing period data (4 hours) and (4 week processing) were compared with the ideal values prepared by the IGS products then specifying the difference value. The results may be adopted as a guide for the surveyor to specify the optimum method of observing.

     

     

  • Keywords


    DOP , GNSS , GPS , IGS ,OPUS .

  • References


      [1] Breitsch, B. (2017). LINEAR COMBINATIONS OF GNSS PHASE OBSERVABLES TO IMPROVE AND ASSESS TEC ESTIMATION PRECISION. Electrical and Computer Engineering. Colorado, Colorado State University. Published Master Thesis.

      [2] Buffett, B., et al. (2016). "Evidence for MAC waves at the top of Earth's core and implications for variations in length of day." Geophysical Journal International 204(3): 1789–1800.

      [3] Chen, L., et al. (2018). "GNSS global real-time augmentation positioning: Real-time precise satellite clock estimation, prototype system construction and performance analysis." Advances in Space Research 61(1): 367-384.

      [4] Defraigne, P. (2015). "Monitoring of UTC(k)’s using PPP and IGS real-time products." GPS Solutions 10(1): 165–172.

      [5] Elsobeiey, M. and S. Al-Harbi (2016). "Performance of real-time Precise Point Positioning using IGS real-time service." GPS Solutions 20(3): 565–571.

      [6] Hafedh, H. (2017). Accuracy Assessment of Different GNSS Processing Software. Surveying Engineering Engineering Technical College – Baghdad Middle Technical University. Master: 76.

      [7] Huang, G., et al. (2018). "An Improved Predicted Model for BDS Ultra-Rapid Satellite Clock Offsets." Remote Sensing 10(1.(

      [8] IGS (2018). "INTERNATIONAL GNSS SERVICE . http://www.igs.org/products."

      [9] Jia, R. X., et al. (2014). "Broadcast Ephemeris Accuracy Analysis for GPS Based on Precise Ephemeris." Applied Mechanics and Materials 602: 3667-3670.

      [10] Li, B. (2018). "Review of triple-frequency GNSS: ambiguity resolution, benefits and challenges." The Journal of Global Positioning Systems 16(1).

      [11] Maciuk, K. (2016). "THE STUDY OF SEASONAL CHANGES OF PERMANENT STATIONS COORDINATES BASED ON WEEKLY EPN SOLUTIONS." The Journal of Space Research Centre of Polish Academy of Sciences 51(1): 1–18.

      [12] NASA (2015). "Daily GPS Broadcast Ephemeris Files, https://cddis.nasa.gov/Data_and_Derived_Products/GNSS/broadcast_ephemeris_data.html."

      [13] Nothnagel, A., et al. (2006). Observation of the Earth System from Space. Institut für Astonomische Physikalische GeodäsieTU München München Germany, Earth and Environmental Science.

      [14] Prange, L., et al. (2016). "CODE’s five-system orbit and clock solution—the challenges of multi-GNSS data analysis." Journal of Geodesy 91(4): 345–360.

      [15] Ray, J., et al. (2017). "IGS polar motion measurement accuracy." Geodesy and Geodynamics 8(6): 413-420.

      [16] Seppänen, M., et al. (2012). "Autonomous Prediction of GPS and GLONASS Satellite Orbits." Journal of the Institute of Navigation 59(2): 119-134.

      [17] Steffen (2018). "A Day Is Not Exactly 24 Hours https://www.timeanddate.com/time/earth-rotation.html."

      [18] Tang, C., et al. (2016). "Improvement of orbit determination accuracy for Beidou Navigation Satellite System with Two-way Satellite Time Frequency Transfer." Advances in Space Research 58(7): 1390-1400.

      [19] UTC (2018). "A Day Is Not Exactly 24 Hours . https://www.timeanddate.com/time/earth-rotation.html."

      [20] Wanninger, L. (2000). "The Performance of Virtual Reference Stations in Active Geodetic GPS-networks under Solar Maximum Conditions." Proceedings of ION GPS 99: 1419 - 1428.


 

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Article ID: 26412
 
DOI: 10.14419/ijet.v7i4.20.26412




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