共查询到19条相似文献，搜索用时 93 毫秒
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频谱分析方法在气氡周期分析中的应用 总被引：1，自引：1，他引：0
利用数字信号处理的相关理论与方法,对聊古1井两年的气氡逐时值数据进行适当的滤波处理,用频谱分析的方法提取潜在周期信息。结果表明：聊古I井气氡数据除明显的年周期外,还存在12小时、24小时的短周期效应和1～2个月的中长周期波动。说明数字信号处理技术对地震前兆数据处理有很好效果和应用前景。 相似文献
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本文共分 1 2章 ,4个部分。1 非稳态非线性信号处理理论在这一部分中 ,论述了 5种数字信号处理理论 ,其中自适应滤波 ( adaptive)、小波变换( wavelet)和魏格纳变换 ( Wignerdistribution)是非稳态信号处理方法 ,而时谱和人工神经网络 ( artificial neural networks)是非线性信号处理方法。在论述过程中 ,力求做到数学推导简练、物理概念清楚明了 ,并与后面几章应用中的计算机实现做好衔接。例如在自适应滤波的阐述中 ,特别注意如何从稳态的维纳滤波过渡到非稳态滤波 ,以及各自的物理意义。又如在小波变换的阐述中 ,借助康托集(Cantor)很… 相似文献
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提出了一种新的基于信号子空间分解技术的3 D地震资料高分辨率处理方法.利用信号子空间分解技术,不仅可以分离3 D地震资料中的信号和噪声,而且可以进一步根据地震同相轴的倾角不同,将混合信号进行分解得到单个同相轴信号.通过丢弃噪声子空间,只对不同信号子空间重构的信号利用谱白化技术进行高分辨率处理,然后累加所有处理结果,从而达到既提高地震资料的分辨率,又提高地震资料信噪比的目的.对合成资料和实际地震资料的处理结果表明,此法具有好的应用前景. 相似文献
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Non-linear Technique for Abstracting the Non-metallic Pipeline Image from GPR Section 相似文献
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In this paper, an improved data processing procedure is proposed for the purpose of ground penetrating radar (GPR) image restoration. The image processing method is achieved by combining the isotropic and anisotropic total-variation (TV) model of split Bregman, suppressing the staircasing effect and circumventing the edges blurred. Numerical experiments indicate that the proposed approach can well recover edges and most of the details of a (GPR) image. Hence, the proposed method is efficient in (GPR) image restoration. 相似文献
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针对探地雷达信号处理和分析时小波基选取存在的问题,本文在分析探地雷达信号特点的基础上,首先从理论上讨论小波基的选取准则,然后再从实验角度进行对比、判别,认为在进行小波分解和重构时应该分别选择不同的小波基函数进行处理,这样可以保证重构信号的精确度,增强对信号的处理能力,从而也突破了以往分解与重构时都采用同一个小波基进行处理的做法.最后通过实际资料的处理,指出bior2.6小波基在进行雷达信号处理时效果最佳,不仅去噪彻底,而且能够保留有效信号的高频部分,提高信号的分辨率和信噪比,为后续解释工作打好了基础. 相似文献
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This paper analyses the possibility of using integrated GPS (Global Positioning System) surveys and ground penetrating radar surveys to precisely locate damages to levees, particularly due to the activity of small fossorial mammals. The technology of intercommunication between ground penetrating radar (GPR) and an RTK (Real-Time Kinematic) survey unit, and the method of data combination, are presented. The errors which may appear during the survey work are also characterized. The procedure for processing the data so that the final results have a spatial character and are ready to be implemented in digital maps and geographic information systems (GIS) is also described. 相似文献
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Chih-Sung ChenYih Jeng 《Journal of Applied Geophysics》2011,75(1):113-123
An alternative data processing procedure is proposed in this paper for the purpose of enhancing the signal/noise (S/N) ratio of ground penetrating radar (GPR) data. The processing methodology is achieved by performing the logarithmic transform in conjunction with the ensemble empirical mode decomposition (EEMD), a new nonlinear data analysis method in signal processing. The synthetic model study and field example indicate that the logarithmic transform is effective in alleviating the attenuation problem. Additionally, the spectrogram obtained from Hilbert-Huang transform (HHT) shows that the decomposition sensitivity of the EEMD method is greatly improved with the aid of the logarithmic transform. This new method allows us to extract the signal components from noisy GPR data efficiently. The success of this study suggests a possible nonlinear analysis application in future GPR investigation, particularly in the filter design and gain correction. 相似文献
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本文阐述了混凝土体无损检测的基本方法技术。将地质雷达方法引入该领域中,结合工程实例研究地质雷达在混凝土非破损检测中的应用效果。并针对实际问题,利用分形技术对雷达资料进行处理,以提取雷达高分辨率信息。 相似文献
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探地雷达技术（GPR）在地下金属矿中应用日益广泛,然而复杂的井下环境时常影响雷达的测试效果.鉴别、分析各种干扰因素,有利于消除和抑制环境噪音在雷达中产生测试伪信号.本文结合作者在地下金属矿中的测试经验,探讨了GPR在金属矿井下测试过程中遇到的几种常见的干扰因素,分析其在雷达图象中呈现基本特征,并提出相应的处理措施与方法. 相似文献
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Francesco Soldovieri Giancarlo Prisco Raffaele Persico 《Journal of Applied Geophysics》2009,67(4):288-295
In this paper we deal with an indirect measure of the dielectric permittivity of the soil starting from GPR surface data collected on a buried “cooperative” target, meant as an object buried on purpose and whose extent is known a-priori. This target is exploited in order to achieve, from its image obtained from a suitable GPR data processing, an indirect measure of the dielectric permittivity of the embedding soil. GPR data processing is based on a linear microwave tomographic approach funded on the Born Approximation. Using this Born approach on two-dimensional inversion tests, we investigate the effect of the soil's electrical conductivity and permittivity on this indirect measure and demonstrate that the electrical field scattered by a spot-like buried object permits an accurate estimation of the soil permittivity even when no information of the soil conductivity is available. 相似文献