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GNSS系统及其技术的发展研究 总被引:2,自引:1,他引:2
阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议. 相似文献
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The inverse distance weighted model (IDWM) represents a geo-spatial interpolation technique used for estimation of ionospheric
vertical delays at the ionospheric grid points (IGPs) and user ionospheric pierce points (IPPs). The GPS Aided Geo Augmented
Navigation (GAGAN) system is planned for air-navigation over the Indian service region using a space based augmentation. One
of the main needs for GAGAN is to develop a suitable grid-based ionospheric model for estimating the vertical delay and its
error bound, i.e., grid ionospheric vertical error (GIVE) at all the IGPs covering the Indian subcontinent. Dual frequency
GPS receiver data obtained from 17 total electron content (TEC) stations are considered in the analysis. For a typical IGP
(25°N, 75°E), variations in the GIVE for a few days of quiet ionosphere are presented. For a quiet and magnetically moderate
day, the mean and standard deviations of the user IPP (UIPP) estimation error and the mean GIVE are presented using the IDWM
with Klobuchar, Junkins and bilinear models. 相似文献
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