In this paper, for any given observation time and suitable moving observation domains, the author establishes a sharp observability inequality for the Kirchhoff-Rayleigh plate like equation with a suitable potential i...In this paper, for any given observation time and suitable moving observation domains, the author establishes a sharp observability inequality for the Kirchhoff-Rayleigh plate like equation with a suitable potential in any space dimension. The approach is based on a delicate energy estimate. Moreover, the observability constant is estimated by means of an explicit function of the norm of the coefficient involved in the equation.展开更多
声相关海流剖面仪(ACCP)适合深海测速,能够测得相对海底的绝对速度。文章在前人工作基础上,以声纳方程为基础,构造海底混响回波仿真模型,并对基于K irchhoff近似和利用微扰法的R ay le igh-R ice近似相结合的散射模型赋予新的物理意义,...声相关海流剖面仪(ACCP)适合深海测速,能够测得相对海底的绝对速度。文章在前人工作基础上,以声纳方程为基础,构造海底混响回波仿真模型,并对基于K irchhoff近似和利用微扰法的R ay le igh-R ice近似相结合的散射模型赋予新的物理意义,并将其应用到声相关测速仿真研究过程中,使仿真更加接近于海洋的实际环境。文章利用H ilbert变换进行包络检波来减小测速误差,并且根据接收信噪比得到了不同航速时能够达到最大底跟踪的距离,这与参考文献给出的结果是一致的。展开更多
为了进行声相关计程仪(ACL)仿真研究,结合K irchhoff近似和R ay le igh-R ice近似散射模型,根据ACL垂直发射波束的特点,在掠射角90°附近,利用已发表的海底散射实验数据与APL-UW散射模型及L am bert公式的理论计算结果相比较,基于K ...为了进行声相关计程仪(ACL)仿真研究,结合K irchhoff近似和R ay le igh-R ice近似散射模型,根据ACL垂直发射波束的特点,在掠射角90°附近,利用已发表的海底散射实验数据与APL-UW散射模型及L am bert公式的理论计算结果相比较,基于K irchhoff近似的散射模型与实验数据具有很好的一致性,仿真结果证明,由于不同类型海底沉积物引起的体积散射在上述情况下是可以被忽略的,这将大大简化进行声相关测速仿真研究的海底建模过程。展开更多
基金supported by the National Natural Science Foundation of China(Nos.10831007,60821091,60974035)
文摘In this paper, for any given observation time and suitable moving observation domains, the author establishes a sharp observability inequality for the Kirchhoff-Rayleigh plate like equation with a suitable potential in any space dimension. The approach is based on a delicate energy estimate. Moreover, the observability constant is estimated by means of an explicit function of the norm of the coefficient involved in the equation.
文摘声相关海流剖面仪(ACCP)适合深海测速,能够测得相对海底的绝对速度。文章在前人工作基础上,以声纳方程为基础,构造海底混响回波仿真模型,并对基于K irchhoff近似和利用微扰法的R ay le igh-R ice近似相结合的散射模型赋予新的物理意义,并将其应用到声相关测速仿真研究过程中,使仿真更加接近于海洋的实际环境。文章利用H ilbert变换进行包络检波来减小测速误差,并且根据接收信噪比得到了不同航速时能够达到最大底跟踪的距离,这与参考文献给出的结果是一致的。
文摘为了进行声相关计程仪(ACL)仿真研究,结合K irchhoff近似和R ay le igh-R ice近似散射模型,根据ACL垂直发射波束的特点,在掠射角90°附近,利用已发表的海底散射实验数据与APL-UW散射模型及L am bert公式的理论计算结果相比较,基于K irchhoff近似的散射模型与实验数据具有很好的一致性,仿真结果证明,由于不同类型海底沉积物引起的体积散射在上述情况下是可以被忽略的,这将大大简化进行声相关测速仿真研究的海底建模过程。
