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Analysis on Vehicle Tracking Error due to Radio Refraction  

Oh, Chang-Yul (한국항공우주연구원 우주센터 기술관리팀)
Lee, Hyo-Keun (한국항공우주연구원 우주센터 기술관리팀)
Oh, Seung-Hyeub (충남대학교 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.11A, 2010 , pp. 1078-1084 More about this Journal
Abstract
The tracking performance of a big parabola tracking antenna system for tracking and receiving of the signal from the vehicle is impacted by many factors of the internal and the external of the system. In this paper, we analyze the tracking error due to the radio refraction in the application of the tracking and positioning of the vehicle by using radio frequency. The real measurement data are used for the analysis which had been acquired by using GPS and the tracking systems of C- and S-band frequencies in NARO Space centre. To verify the correlation between the tracking errors measured and the radio refraction, we review the error factors and the accuracies of the tracking systems, and the characteristics of the refractivity. The analysis shows that there are angular errors which are due to the radio refraction and not to be neglected, compared to the accuracies of the tracking systems, in case of low elevation angle less than 10 degrees. Also, the tracking errors depend on the target altitude as well as the elevation angle for the case of the target in the troposphere. It is recommended to correct the tracking angle considering the target altitude and elevation angle for the precise target positioning.
Keywords
Refractivity; Radio Refraction; Tracking Accuracy; Elevation Angle; Parabola Antenna;
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