CAJ | 학술논문

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4 m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4 m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.
종현유적GNSS-R(GNSS Reflectometry )측고이론출발,득출료측고정도회수고도각적감소이강저적결론 ,병분석료우우4 m적측고정도수요만족고도각대우31°적조건 ;재일조실제실험수거중 ,우우4 m적측고정도수요만족고도각체도38° ,고필도실제정황수도해풍、해면조조도등인소적영향 ,실험결론여이론치시일치적.이고도각수요만족적해조건위기출 ,대측고사건수량진행료연구 ,병장기여기타학자채용적절지고도각(15°、20°)진행료대비 ,득출고도각제고도38°후 ,사건수량장감소50% 좌우적결론.
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 ..