Analysis And Processing Of Seismic Wave Signal In Explosion Point Location

The location of the explosion point is an important basis for evaluating the accuracy of penetrating and striking weapons,and it is also the basis for conducting weapon damage effectiveness evaluation.Accurate location of the explosion point helps to verify the overall performance of the weapon system,and also provides important data support for the evaluation of the damage effectiveness of the penetration weapon.Accurately acquiring,analyzing and processing the seismic wave signal generated by the explosion is the prerequisite for realizing the location of the explosion point.This article takes the location of the explosion point as the research background,systematically analyzes and researches the problems encountered in the practical application of TDOA location technology,and proposes a targeted solution.From various aspects of discussion and analysis,starting from theoretical knowledge to practical application,the main research contents are summarized as follows:1.According to the explosion seismic wave signal theory and the explosion point location method,using the explosion point location technology based on the TDOA principle,the overall scheme of the explosion seismic wave distributed sensing test network is designed and optimized.Construct a distributed vibration signal acquisition and test system based on wireless sensor network,including distributed test nodes,wireless sensor network and measurement and control software.On the basis of traditional storage test technology,it integrates wireless bridge communication technology to realize remote management of test nodes,parameter configuration,status monitoring and wireless data transmission.At the same time,in view of the technical difficulties of accurate measurement of the test node position,the GNSS-PPK technical solution was proposed,and the GNSS-PPK technology and the Lo Ra wireless longdistance transmission technology were combined to complete the design of a high-precision space reference system and realize the distribution Real-time measurement in a high-precision,wide-area environment for the position of the test node.2.Aiming at the problem of obtaining time delay estimation in TDOA positioning,the basic principle of obtaining time delay by generalized cross-correlation is briefly explained,and the application problem of generalized cross-correlation time delay estimation method in blast point location is analyzed.Aiming at the problem of inaccurate measurement of the delay estimation value caused by factors such as system hardware performance differences and external noise in actual positioning applications,an improved generalized cross-correlation delay estimation method based on LMS adaptation is proposed;it is verified by simulation analysis The performance of the LMS adaptive filtering algorithm;at the same time,the performance of various delay estimation methods is verified by using analog signals.Through the analysis of the actual performance of each method,it can be concluded that the improved delay estimation method obtains a higher precision delay estimation value than the traditional generalized cross-correlation method in obtaining the delay value,and it is more suitable for application in explosions point positioning.3.Taking the positioning algorithm in the location of the explosion point as the research object,the principles,advantages and disadvantages of the Taylor series expansion method and the Chan algorithm are introduced.In order to achieve higher target positioning accuracy and give full play to the advantages of the two algorithms,a joint positioning algorithm based on Chan and Taylor series is proposed.The explosion simulation experiment verified the function of the distributed test system and completed the location of the explosion point.The positioning error is within 0.5m,which can well meet the requirements of the explosion point positioning accuracy.The test results show that the method proposed in this paper effectively reduces the TDOA measurement error and improves the location accuracy of the explosion point.Research on positioning technology based on seismic wave signals and seismic wave signal processing is of great significance to the development of weapons and equipment and military training.