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本文详细介绍了滑动频谱方法,并通过模拟仿真和实测资料处理与后传播方法进行比较.通过对模拟仿真信号反演发现:后传播方法和滑动频谱方法均能削弱大气多路径的影响,后传播方法在一定程度上优于滑动频谱方法;在模拟信号的相位中加入高斯噪声对后传播方法影响不大,但对滑动频谱方法影响较大,尤其在边界层以下.分别用后传播方法和滑动频谱方法对2007年第71天至73天共约4500个COSMIC掩星数据进行处理.将折射率反演结果与ECMWF分析场资料进行统计比较,结果显示:滑动频谱方法反演的掩星廓线深度大于后传播方法;后传播方法求得的折射率相对误差的均值普遍小于滑动频谱方法.
In this paper, the method of sliding spectrum is introduced in detail and compared with the post-propagation method through simulation and measured data processing.It is found from the inversion of the simulation signal that post-propagation method and sliding spectrum method can both weaken the influence of multi-path of atmosphere and post-propagate The method is better than the sliding spectrum method to some extent. Adding Gaussian noise to the phase of the analog signal has little effect on the post-propagation method, but has a great influence on the sliding spectrum method, especially below the boundary layer. The spectral method processed about 4,500 COSMIC occultation data from 71 days to 73 days in 2007. The comparison between the refractive index inversion results and the ECMWF analysis field data shows that the occultation profile retrieved by the sliding spectrum method The depth is greater than the post-propagation method; post-propagation method to find the average relative refractive index error is generally less than the sliding spectrum method.