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随着全球导航卫星系统反射信号(GNSS-R)的提出,GNSS-R在海冰检测领域的应用也越来越广泛。北斗地球同步轨道卫星(GEO)的角速度较小且仰角变化仅有3-4度,因此在相同观测地点其镜面反射点的空间位置非常稳定,可以提高特定区域海冰探测的时间分辨率。对在中国渤海湾进行的两次岸基海冰检测实验(2015年1月24日和2016年1月30日至2月4日)的分析,验证了北斗GEO B1反射信号对沿岸海冰进行长时间连续检测的可行性。第一个实验结果显示海冰密集度与两颗GEO卫星C01和C02的极化比值(左旋反射信号R-LHCP与右旋直射信号D-LHCP:R-LHCP/D-RHCP)结果具有相关性。第二个实验结果显示三颗GEO卫星C01、C02和C03检测的海冰极化比值与大气温度存在正相关关系,其中C01、C02和C03的极化比值与气温的相关值分别为0.61、0.72和0.57。
With the introduction of GNSS-R, GNSS-R has been applied more and more widely in the field of sea ice detection. The dipole geosynchronous orbiting satellite (GEO) has a small angular velocity and an elevation change of only 3-4 degrees. Therefore, the spatial location of specular reflection points at the same observation site is very stable, which can improve the temporal resolution of sea ice detection in a specific area. An analysis of two shore-based sea ice tests conducted in the Bohai Bay of China (January 24, 2015 and January 30 to February 4, 2016) verified that the Beidou GEO B1 reflected signal was applied to coastal sea ice Long-term continuous testing of feasibility. The first experimental result shows that there is a correlation between sea ice concentration and the polarizations of two GEO satellites C01 and C02 (R-LHCP and D-LHCP: R-LHCP / D-RHCP) . The second experimental result shows that there is a positive correlation between the polar ratio of sea ice and the atmospheric temperature detected by the three GEO satellites C01, C02 and C03. The correlations between the polarization ratios of C01, C02 and C03 and temperature are 0.61 and 0.72 And 0.57.