摘要
从现有的GNSS-R(GNSS Reflectometry)测高理论出发,得出了测高精度会随高度角的减小而降低的结论,并分析了优于4m的测高精度需要满足高度角大于31°的条件;在一组实际实验数据中,优于4m的测高精度需要满足高度角达到38°,考虑到实际情况受到海风、海面粗糙度等因素的影响,实验结论与理论值是一致的。以高度角需要满足的该条件为基础,对测高事件数量进行了研究,并将其与其他学者采用的截止高度角(15°、20°)进行了对比,得出高度角提高到38°后,事件数量将减少50%左右的结论。
Based on the present theories of GNSS-R（GNSS Reflectometry）altimetry, the conclusion that the precision of GNSS-R altimetry declines with the decrease of elevation an- gle is achieved. Furthermore, the elevation angle needs to meet the condition of over 31° if a result of better than 4-m-precision wants to be obtained. In a set of actual experimental data, elevation angle needs to be at 38° for better than 4-m precision. Given that actual data is det- rimentally affected by factors, such as ocean wind~ sea surface roughness and so forth, the experimental result is in line with theoretical conclusion. By employing the condition eleva- tion angle meets, the impact of elevation angle on the amount of reflection events is studied. In comparison with cutoff elevation angle used by other researchers （15°and 20°）, the mount of data will decrease by some 50° in this paper..
出处
《全球定位系统》
CSCD
2015年第5期25-29,共5页
Gnss World of China
基金
国家重大科学仪器设备开发专项项目(编号:2012YQ160185)
作者简介
联系人：胡长江E—mail：1050413737@qq．com胡长江（1990-），男，湖南澧县人，硕士，主要从事GNSS-R测高研究。
王磊（1988-），男，湖北襄阳人，硕士，主要从事惯性导航方面的研究。
