RINEX/IONEX 기반 지역전리층/DCB 시뮬레이터의 설계
Design of Regional Ionosphere/Differential Code Bias Simulator Based on RINEX/IONEX Files
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초록
This paper proposes an efficient Regional Ionospheric Map (RIM) / Differential Code Bias (DCB) simulator based on Receiver Independent Exchange (RINEX) and IONosphere Map Exchange (IONEX) format files. Using the proposed simulator, we evaluated if it is possible to discriminate and estimate RIM and DCB variables based on a single regional satellite constellation and reference stations distributed in a restricted area. The proposed simulator embeds a recursive estimator that can discriminate and estimate RIM and DCB variables based on basic RINEX format navigation and observation files. It facilitates the evaluation of accuracy and precision by referencing the IONEX files generated by the estimator and International GNSS Service (IGS). Experiments were performed to evaluate the simulator under difficult environment by applying the RINEX data of the 4 regional satellites received by 11 reference stations distributed in Asia and Oceania region. By the experiment result, the average and the standard deviation of the vertical ionospheric delay (VID) difference were obtained as 0.35 m and 2.73 m, respectively. In the case of satellite DCB, the estimated values matched the group delay values in the broadcast ephemeris parameters with the standard deviation within 0.6 m if the unknown mean value were ignored.
Abstract
This paper proposes an efficient Regional Ionospheric Map (RIM) / Differential Code Bias (DCB) simulator based on Receiver Independent Exchange (RINEX) and IONosphere Map Exchange (IONEX) format files. Using the proposed simulator, we evaluated if it is possible to discriminate and estimate RIM and DCB variables based on a single regional satellite constellation and reference stations distributed in a restricted area. The proposed simulator embeds a recursive estimator that can discriminate and estimate RIM and DCB variables based on basic RINEX format navigation and observation files. It facilitates the evaluation of accuracy and precision by referencing the IONEX files generated by the estimator and International GNSS Service (IGS). Experiments were performed to evaluate the simulator under difficult environment by applying the RINEX data of the 4 regional satellites received by 11 reference stations distributed in Asia and Oceania region. By the experiment result, the average and the standard deviation of the vertical ionospheric delay (VID) difference were obtained as 0.35 m and 2.73 m, respectively. In the case of satellite DCB, the estimated values matched the group delay values in the broadcast ephemeris parameters with the standard deviation within 0.6 m if the unknown mean value were ignored.