GNSS系统及其技术的发展研究   总被引：3，自引：1，他引：2  

赵静  曹冲 《全球定位系统》2008,33(5)

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   

印度卫星导航系统最新进展   总被引：1，自引：0，他引：1  

高为广  陈金平  王楠 《全球定位系统》2008,33(1):42-45

对印度GPS辅助的GEO增强导航系统（GAGAN）和印度自主建设的区域卫星导航系统（IRNSS）的最新研究进展进行了介绍,详细介绍了其系统组成、最新测试结果以及未来的发展计划。  相似文献   

Preliminary analysis of grid ionospheric vertical error for GAGAN     

Niranjan Prasad  A. D. Sarma 《GPS Solutions》2007,11(4):281-288

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