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The IGS has produced clock results only for the GPS satellites and these are tabulated and distributed at the 15-minute intervals used in the sp3 orbit ephemerides files. There is much interest in increasing the satellite clock interval to 30 seconds (e.g., to overcome SA effects on interpolation) and also in producing station clock results (at some appropriate interval, probably 5 minutes). In principle, the sp3 format could continue to be used for both of these extensions, but it would be wasteful considering that the vast majority of the file space is set aside for orbit information. Also, the variety of other clock information that also needs to be exchanged does not lend itself to the sp3 format. Alternatively, the IGS could devise a new format specifically for distributing clock information. It does not appear that the timing community already uses a standard data format that is well suited for the IGS needs.

One essential conclusion of the ionosphere-related discussion was that a common data format to exchange, compare, or combine TEC maps has to be defined. Based on a first format proposal by[Gurtner and Mader,1990],we present a revised version of the so-called IONoshphere map EXchange format(IONEX) that supports the exchange of 2- and 3- dimensional TEC maps given in a geographic grid.

论文从GPS接收机天线入手，系统地分析了GPS干扰和抗干扰技术，在对目前GPS抗干扰技术研究的基础上重点研究了空域滤波技术，采用自适应调零天线实现抗干扰。讨论了功率倒置自适应算法的模型，推导了算法，并对算法进行了改进;改进的算法使天线在波束图上形成的零陷进一步加深和加宽。

《GPS接收机的自适应抗干扰系统研究》硕士论文

《北斗卫星导航系统公开服务性能规范》最新2.0版本

计算机基础知识的部分试题，对考试具有一定的参考意义

计算机基础知识的部分试题，对考试具有一定的参考意义