The main contents include polarimetric interferometric phase coherence optimization ( pipco ) ; random volume over ground ( rvog ) coherence scattering model and corresponding inversion model ; optimization of inversion procedure using ga 主要内容包括:极化干涉相干最优理论,相干散射模型和反演模型以及基于遗传算法的参数反演过程。
During the inversion process of velocity and depth parameter , the velocity parameter should be inversed firstly and then do the depth so as to assure the stability of the final results and the reliability of the solution 在参数反演过程中应采用先反演速度参数、再反演深度参数的方案,这样的步骤使得反演结果较稳定,得到的解更为可信。
( 2 ) model correction and comparison in the process of conversion from zenith day delay to gps water vapor and precision evaluation . saastamoinen ( sa ) model and hopfield ( h ) for dry delay and bevis model for atmospheric weighted temperature are adopted ( 2 )模型订正与比较在gps水汽反演过程中,一般干延迟和大气加权平均温度的计算是采用“普适性”模型,目前应用较多的有saastamoinen ( sa )模型、 hopfield ( h )模型和bevis模型。
Different algorithms were compared in the numerical simulation and model experiment of concrete velocity inversion the results showed that , compared with the least - square solutions and the damped least - square solutions , the damped and natural weighted least - square solutions reflected the inner defections of the tested object more reliably and exactly due to the usage of correct priori information , which benefited the suppression of noises and made the iterations of inverse stable and convergent 结果表明,相对于最小二乘法和阻尼最小二乘法,基于自然权的加权阻尼最小二乘算法,由于利用了正确的先验信息,不但使反演过程收敛,而且具有数值稳定、抗噪能力强的优点,其成像结果能真实有效地反映对象内部缺陷,因此更适用于混凝土的超声波速度反演。