NUMERICAL STUDY OF THE HORIZONTAL DRIFT OF THE GPS SIGNAL RAY’S PERIGEE IN OCCULTATION EVENT

Sun Xuejin; Zhao Shijun; Yu Peng

Vol.15, NO.2, 2004

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Sun Xuejin, Zhao Shijun, Yu Peng. Numerical study of the horizontal drift of the GPS signal ray's perigee in occultation event. J Appl Meteor Sci, 2004, 15(2): 174-180.

Citation:

Sun Xuejin, Zhao Shijun, Yu Peng. Numerical study of the horizontal drift of the GPS signal ray's perigee in occultation event. J Appl Meteor Sci, 2004, 15(2): 174-180.

Sun Xuejin, Zhao Shijun, Yu Peng. Numerical study of the horizontal drift of the GPS signal ray's perigee in occultation event. J Appl Meteor Sci, 2004, 15(2): 174-180.

Citation:

Sun Xuejin, Zhao Shijun, Yu Peng. Numerical study of the horizontal drift of the GPS signal ray's perigee in occultation event. J Appl Meteor Sci, 2004, 15(2): 174-180.

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NUMERICAL STUDY OF THE HORIZONTAL DRIFT OF THE GPS SIGNAL RAY’S PERIGEE IN OCCULTATION EVENT

nstitute of Meteorology , PLA Univ .of Sci .and Tech ., Nanjing 211101

Received Date: 2002-10-29
Rev Recd Date: 2003-04-06
Publish Date: 2004-04-30

Abstract

Abstract

The GPS signal ray’s perigee from the top of neutral atmosphere to the ground drifts largely in horizontal at an occultation event. The occultation event is simulated using the ray-tracking technique on the situation of the specified atmospheric refractive index model and the GPS constellation. The effect of atmospheric refractive index profile, LEO satellite’s height and inclination on the horizontal drift of the perigee studied. The results indicate that the difference between the average horizontal drift on day and that at night is about 20 km, the minimum of the average horizontal drift appears at some inclination 130° and the average horizontal drift increases from inclination 130° to 0° or 180° for a LED satellite which is at an altitude of 735 km above ground, and the average horizontal drift decreases from 400 km to 1500 km above ground for a LEO satellite at inclination 70°.
- GPS;
- LEO;
- Occultation event;
- Perigee 's horizontal drift

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References(6)

Figures and Tables

图 1 大气折射指数垂直分布图

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图 2 不同轨道倾角下掩星切点水平漂移变化

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图 3 不同轨道倾角下不同地区掩星切点的水平漂移变化

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图 4 不同轨道高度下掩星事件的切点水平漂移变化

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图 5 不同轨道高度下不同地区的掩星事件的切点水平漂移变化

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表 1 两种大气折射指数垂直分布时的水平漂移

References

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