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中文摘要：
设计了利用对流层散射通信进行双向时间比对方法,对比分析了NMF、VMF1和GMF共3种映射函数特征和参数选取方法,简化并假设对流层大气层,提出了基于映射函数进行对流层双向时间比对斜延迟分析的方法,选取东北亚中纬度地区的4个代表性GPS测站进行了对比分析。根据所选测站的地理位置情况和探空数据分析表明,所选测站间的斜延迟呈现年周期余弦函数分布特征,且大致呈夏季最大冬季最小分布,且3种映射函数下斜延迟大致相同,GMF有实时获得的优势。研究了高度角变化条件下的斜延迟误差分布,运算结果表明斜延迟误差也近似呈余弦函数分布,且夏季最小冬季最大,在误差角为0.01°时,最大延迟误差对应的时延约为0.2 ns。
英文摘要：
The characters and parameter selection of NMF（Niell mapping function）, VMF1（Vienna mapping functions 1） and GMF（global mapping function） are compared and analyzed. By simplfying troposphere atmosphere into stratified atmosphere, a method for analyzing slant propagation delay（SPD） in two way time troposphere transfer（TWT3） is proposed based mapping functions. The geographical conditions and radiosonde data of four representative stations in the mid latitude areas of northeast Asian analyzed and compared. The results reveal that the SPD is approximately subject to the distribution of cosine function with a yearly period and maximum in summer minimum in winter, and the three mapping functions（NMF, VMF1, and GMF） in the chosen stations shows roughly the same SPD but GMF shows the superiority of real-time obtaining parameters. The SPD errors distribution in the condition that elevation angle changes is studied. The results show that the maximum delay error of SPD is 0.2 ns while the error angle is 0.01 degree.
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