全球导航卫星系统反射信号GNSS-R(Global Navigation Satellite System Reflection)可以用来探测海面状态,如海面有效波高。介绍了利用GNSS反射信号测量海面有效波高的观测设备和技术原理,对2009年博贺实验的数据进行了分析,证实了反射信号相关复数场的有效相关时间与有效波高之间存在相关,利用前期观测的数据进行拟合,得出反演公式,并与测波雷达数据进行了结果对比,平均误差0.136m,相对偏差12.02%,均方根偏差0.169m。
Global Navigation Satellite System (GNSS) reflection signals could be used for sea-state sounding, for instance, the significant wave height. This paper introduced the observation equipment and the technical principle about the significant wave height sounding by GNSS reflected signals. By analyzing the data from Bohe experiment during 2009, we confirmed that the significant wave height was related to the significant coherence time of the interferometric complex field. An inversion formula was obtained by fitting the prophase data, and the results were compared with the data from Wave Monitoring System. The average deviation is 0.136 m with the relative standard deviations of 12.02%, and the root-mean-square error is 0.169 m.
[1] MARTIN-NEIRA M. A passive reflectometry and interferometry system (PARIS): Application to ocean altimetry [J]. ESA J, 1993, 17(4): 331-355.
[2] GARRISON J L, KATZBERG S J, HILL M I. Effect of sea roughness on bistatically scattered range coded signals from the Global Positioning System [J]. Geophys Res Lett, 1998, 25(13): 2257-2260.
[3] ELFOUHAILY T, CHAPRON B, KATSAROS K, et al. A Unified Directional Spectrum for Long and Short Wind-driven Waves[J]. J Geophys Res, 1997, 102(7): 15781-15796.
[4] 刘经南, 邵连军, 张训械. GNSS-R 研究进展极其关键技术[J]. 武汉大学学报: 信息科学版, 2007, 32(11): 955-960.
[5] SOULAT F, CAPARRINI M, GERMAIN O, et al. Sea state monitoring using coastal GNSS-R[J]. Geophys Res Lett, 2004, 31: 1-4.
[6] VALENCIA E, CAMPS A, MARCHAN-HERNANDEZ J F, et al. Experimental Determination of the Sea Correlation Time Using GNSS-R Coherent Data[J]. Geosci Remote Sens Lett, 2010, 7(4): 675-679.
[7] 张训械, 邵连军, 王鑫, 等. GNSS-R 地基实验[J]. 全球定位系统, 2006, 31(5): 4-8.
[8] 王鑫, 孙强, 张训械, 等. 中国首次岸基GNSS-R海洋遥感实验[J]. 科学通报, 2008, 53(5): 589-592.
[9] 邵连军, 张训械, 王鑫, 等. 利用GNSS-R信号反演海浪波高[J]. 武汉大学学报: 信息科学版, 2008, 33(5): 475-478.
[1]