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为解决现有方法在反演层状介质介电常数时耗时长、效率低和对薄层介质不敏感的问题,提出了一种基于改进的模拟退火算法反演层状介质介电常数信息的新方法。该方法利用电磁波在各介质层中的双程时延的先验信息来减少反演参数的个数,降低算法复杂度,提高反演效率;利用非均匀变异思想改进传统模拟退火算法的扰动模型来加快收敛速度。同时,通过模拟回波与实际回波的差值来提取被强回波覆盖的时延信息,增强算法对薄层介质的识别能力,提高算法的实用性。实验结果证明了该方法对层状介质介电常数的反演具有很高的准确性和稳定性。
In order to solve the problem of time consuming, inefficient and insensitive to the thin-film media, the proposed method is based on the improved simulated annealing algorithm to retrieve the dielectric constant of layered media new method. This method uses the prior information of the two-way delay in each dielectric layer to reduce the number of inversion parameters, reduce the complexity of the algorithm and improve the inversion efficiency. The non-uniform variation method is used to improve the disturbance model of the traditional simulated annealing algorithm convergence speed. At the same time, the time delay information covered by strong echoes is extracted by simulating the difference between the echo and the actual echo, and the recognition ability of the algorithm to the thin layer medium is enhanced and the practicability of the algorithm is improved. Experimental results show that this method has high accuracy and stability for the inversion of dielectric constant in layered media.