基于SAR的海上溢油监测最佳探测参数分析

摘要

On the basis of the SAR data, on the backscattering coefficient computation's foundation, the marine oil spill monitoring and surveying parametric analysis have been carried out from wave band, polarization mode, incidence angle. The result shows that based on the SAR marine oil spill monitor, from the wave band analysis, X wave band and C wave band are more suitable to monitoring marine oil spill comparing with L wave band; from the polarization mode analysis, VV polarization is more suitable to monitoring marine oil spill comparing with HH and HV polarization; from the incidence angle analysis, when the critical value of oil spill and seawater is conparted, after testing many times, doubtful oil spill located at the far incidence angle separates not easily with the seawater;doubtful oil spill of the relatively near incidence angle separates easily with the seawater. The ALOS PALSAR inage's incidence angle is approximately 23°～43°, the COSMO-SlyMed incidence angle is 32°～35°, the incidence angle which separates the seawater from the oil spill is approximately easy 23°～35°.%基于SAR数据,在后向散射系数计算的基础上,从波段、极化方式、入射角等方面开展了海上溢油监测参数分析,结果表明:基于SAR的海上溢油监测,从波段分析,X波段与C波段较L波段更适合监测海上溢油;从极化方式分析,VV极化较HH,HV极化更适合监测海上溢油;从入射角分析,在计算溢油与海水临界值时,经多次实验,位于远入射角的疑似溢油不易与海水分离,而相对近入射角的疑似溢油较容易与海水分离.ALOS PALSAR影像的入射角约为23°～43°,COS-MO-SlyMed入射角为32°～35°,易于将海水与溢油分离的入射角大致为23°～35°.