Research On The Explosion Location Technique Based On Multi-array Fusion

Explosion point accuracy is an important indicator to measure the performance of weapons and ammunition,especially in the development and testing of new weapons.At present,light detection or radar detection is mostly used in shooting range test.Such methods are susceptible to the influence of light conditions and electromagnetic waves,and have disadvantages such as complex systems and high costs.Passive acoustic positioning technology has the characteristics of simple principle,convenient array layout,and not being affected by light and electromagnetic waves.Therefore,in this paper,a multi-array fusion sound source test system based on time delay is proposed,and a prototype of the three-array fusion test system is built.The main research contents are as follows:(1)The propagation law of sound waves and explosion waves in the air is analyzed,and some acoustic positioning methods are introduced.In order to solve the problem that the speed of sound is greatly affected by the environmental temperature and the signal-to-noise ratio of the test environment is low,the actual sound speed is calculated by using the measured environmental temperature and substituted into the positioning algorithm to reduce the positioning error caused by the sound speed error.(2)The principle of generalized cross-correlation time delay estimation is introduced.The difference between several different weighting functions,and simulated under different signal-to-noise ratio environments is analyzed.In order to solve the problem of inaccurate time delay estimation in low-noise environment,the spectral subtraction method is introduced to reduce noise,and simulation verification is carried out.The method that using spectral subtraction combined with the cross-power spectrum phase weighting method based on generalized cross-correlation is proposed to obtain the delay estimation value.The result of simulation verification shows that this method can improve the accuracy of time delay estimation under low signal-to-noise ratio.(3)The mathematical model of the five-element three-dimensional array is established,the direction finding and ranging error are analyzed,and the direction finding error is simulated.Aiming at the problem of excessively large ranging error of single-array under far-field conditions,a method of weighted correction of delay value using sensor data fusion is proposed;The method of cross-straight line on different planes is used to realize single-array direction finding and multi-array fusion positioning.(4)The hardware of the test system was selected,and a test prototype of the three-base array explosion point sound source positioning system was built.Many simulation tests have been carried out.According to the analysis of experimental data,it can be seen that the azimuth and elevation angle errors of the single array are less than 2° after the data fusion algorithm,and the positioning errors of the multiple arrays are all less than 3%,which verifies that the explosion point acoustic localization method of the multi-array fusion has high localization accuracy.