Study On Acoustic Location Algorithm For Precipitation And Hail Suppression

Weather modification(shadow operation)is of great significance for agriculture and ecological management in China.Nowadays,the anti-aircraft gun system is the most widely used launching device.But at present,there is no effective evaluation of the effect of human figure.In addition,at present,the location of rainproof hail bullet is mainly calculated by geometric model,but often due to the atmospheric effect,the shell will drift,resulting in the position estimation of explosion point resulting in the error that can not be estimated,resulting in the result that it is difficult to retrieve the duds.In this paper,based on the analysis of the propagation characteristics of the explosion sound of the rainproof and hail proof bombs,the explosion sound acquisition system based on the Multiple matrices rainproof and hail proof bombs is designed,and aiming at the problem of the explosion sound signal processing,the explosion sound positioning algorithm based on the probability density of the rainproof and hail proof bombs is designed.The details are as follows:First,two models of single array positioning,the establishment of plane four element array and three-dimensional seven element array,as well as the positioning algorithm are studied and error simulation are carried out.It is found that the positioning error of single array is large and the orientation accuracy is high.Then,Multiple matrices positioning strategy based on probability density algorithm is designed.Secondly,through the analysis of the signal acquisition environment,the signal extraction strategy is proposed.Aiming at the accurate extraction of outdoor high-altitude blast signal,through the study of wavelet transform and other algorithms,a wavelet threshold denoising method with improved threshold function is used to denoise the signal and improve the signal-to-noise ratio of blast signal.Aiming at the blast signals of several hail bombs,adouble threshold endpoint detection technology is designed based on short-time energy and short-time zero crossing rate.Aiming at the problem that the traditional generalized cross-correlation can not meet the accuracy of time-delay estimation,the time-delay estimation is carried out by using the Phat weighted generalized cross-correlation to improve the robustness of time-delay estimation in noisy environment.Then,the software and hardware part of the whole system is constructed.The software part designs the whole Multiple matrices positioning algorithm based on probability density function realized in MATLAB software.In the hardware part,according to the actual needs,select the appropriate sound sensor and acquisition card to build the hardware system.Finally,the performance of the whole acquisition system and positioning algorithm is tested.The test results show that the acquisition system works well.The experimental results show that the location error of the algorithm is small and the location accuracy is high.In this paper,the location algorithm also provides a convenient method for the location of rain increasing hail bullet.