Volume 33 Issue 4
Jul.  2013
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Article Navigation >  Chinese Journal of Space Science  > 2013  >  33(4): 427-435
JIN Yaqi, ZHANG Donghe, LIU Yumei, HAO Yongqiang, XIAO Zuo. Influence of Ionospheric Variability in Solar Maximum and Solar Minimum Period on the Stability of Estimated GPS Instrumental Biases[J]. Chinese Journal of Space Science, 2013, 33(4): 427-435. doi: 10.11728/cjss2013.04.427
Citation: JIN Yaqi, ZHANG Donghe, LIU Yumei, HAO Yongqiang, XIAO Zuo. Influence of Ionospheric Variability in Solar Maximum and Solar Minimum Period on the Stability of Estimated GPS Instrumental Biases[J]. Chinese Journal of Space Science, 2013, 33(4): 427-435. doi: 10.11728/cjss2013.04.427
shu

Influence of Ionospheric Variability in Solar Maximum and Solar Minimum Period on the Stability of Estimated GPS Instrumental Biases

doi: 10.11728/cjss2013.04.427 cstr: 32142.14.cjss2013.04.427
  • 1.

    School of Earth and Space Sciences, Peking University, Beijing 100871

  • 2.

    National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107

  • Received Date: 2012-05-08
  • Rev Recd Date: 2013-02-10
  • Publish Date: 2013-07-15
    Abstract
  • It is an important step to estimate the GPS instrumental biases in the process of calculating the ionospheric Total Electron Content (TEC) from GPS data, and the estimation of GPS instrumental biases is the main source of errors in the GPS observed TEC. Therefore, study of the estimated instrumental biases is helpful for understanding the accuracy of ionospheric TEC derived from GPS observation. In this paper, data from two mid-latitude GPS stations was used to derive the instrumental biases of GPS satellites in solar maximum and minimum periods. The stability and statistical characteristics of estimated instrumental biases observed at BJFS and URUM stations in 2001, 2007 and 2009 are given. The influence of ionospheric morphology on the estimation of GPS instrumental biases was studied by analyzing the ionospheric data in the same periods. By comparing the estimated GPS instrumental biases under different ionospheric condition, the accuracy and usability of GPS observed ionospheric TEC were analyzed. Results show that the stability of estimated instrumental biases using GPS data from solar maximum period (in 2001) is poorer than that from solar minimum period (in 2007 and 2009). The yearly RMS value of estimated instrumental biases in 2001 is about 1TECU, and the yearly RMS value is about 0.8TECU in 2007 and 2009. In view of hypothesis in the process of calculating the ionospheric TEC, combining with the analysis of variability of ionospheric critical frequency observed at Beijing station, it is believed that the connection between stability of estimated instrumental biases and the solar cycle phase is related with the differences of ionospheric variability in solar maximum and minimum. Study on the stability of estimated instrumental biases indicates that the accuracy of ionospheric TEC derived from GPS observation is different in different solar cycle phase, and the error of ionospheric TEC caused by instrumental biases of the satellites is about 1TECU.

     

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