The paper introduced computing method of stress wave for structure’s surface in sandy soil medium,discussed matching error between piezoresistance pressure transducer and sandy soil medium.Stress wave of structure’s surface in sandy soil medium be measured by pressure sensor,the experimental data indicate that sandy soil can improve concrete structure’s shock resistance.

Time delay estimation is a key technology of array signal processing, which is designed to estimate the time delay of the sound source signal reaches different sensor. Because of differences in the weighting function method, existing methods of generalized cross-correlation time delay estimation have their own anti-noise and anti-reverberation characteristics. In this paper, the existing various delay estimation algorithm comprehensive is compared, which reveals their advantages and disadvantages, and further improved direction of time delay estimation algorithm is given.