Research On The Acoustic Positioning System Of Aerial Explosion Point

In the shooting range test,the position information of certain weapons and ammunition exploding in the air is an important basis for measuring the performance of the weapon.Therefore,how to accurately measure the three-dimensional coordinates of an airborne blast point has become one of the research hot spots in recent years.At present,the commonly used measuring method abroad is to measure the three-dimensional coordinates of the air blast point by using a large-field television theodolite.However,the system is bulky and expensive,making it difficult to popularize.In China,the photoelectric measurement method and the acoustic measurement method are widely used,and the acoustic measurement method is based on the passive acoustic detection technique.The method has the advantages of simple principle,low cost and convenient use.The airborne bombing point positioning algorithm based on passive acoustic sounding is studied.The system has a good theoretical significance and high practical value.This project relies on a cooperation project with a research institute,aiming at a certain type of explosion-proof bomb,using passive acoustic detection technology,based on the multi-array joint positioning method,an airborne point-to-point sound localization system is designed and implemented.First of all,based on the air blast characteristics of a certain type of explosion-proof projectile,the layout schemes of three kinds of common air-blast acoustic positioning systems are analyzed.The three schemes are compared from the positioning principle and the robustness.Program.On this basis,the research on the method of airborne point-point sound localization based on multi-array is carried out.The method consists of two parts:single-array sound source direction finding and multi-array data fusion positioning.First of all,by analyzing and comparing several commonly used single-array sound source direction finding methods,the method of source direction finding based on time-delay estimation is studied emphatically.Several commonly used time-delay estimation algorithms are expounded,and the method of generalized cross-correlation According to the four-element three-dimensional array,the source direction finding formula is deduced.According to the multi-array data fusion positioning,two kinds of multi-array data fusion positioning methods are analyzed:spatial heterogeneous linear cross method and total least square method,Described in detail their positioning principle and process.Finally,a large number of simulation experiments were carried out to analyze the effect of array element position error and delay estimation error on the DF accuracy of a single array sound source and the positioning performance of the whole multi-array system.The simulation experiments and the related field experiments show that the airborne point-to-point acoustic localization system based on multi-array presented in this paper has good localization performance and provides a convenient and effective means for the accurate measurement of the airborne blast point in the shooting range.