Research On Acoustic Target Location Method Of Battlefield

On the land battlefield,passive acoustic positioning equipment can detect dead zones in radar and laser equipment,with concealment and reliability.Small-volume and high-precision acoustic positioning equipment for individual wear is a hot topic in aeroacoustic applications.Conventional terrestrial acoustic positioning sensors always have a large volume inconvenient for mobile,or have lower detection accuracy.In view of this,this paper starts with small aperture acoustic array and single elementary sensor,and studies the azimuth estimation method based on signal characteristics,and establishes the target positioning system.The specific work is as follows:Firstly,it introduces the propagation characteristics of sound waves in the air environment.Then it analyzes the noise of common acoustic targets on land battlefield and their signal characteristics.Secondly,it studies the phase difference,phase gradient algorithm and differential pressure algorithm based on small aperture array.Mathematical models are given for three different algorithms,and the angle formula in three-dimensional space is also derived.Then the performance simulations for methods above,and the error analysis according to the principle are carried out.Then small-aperture arrays are used to form a two-array static target positioning system.Use the triangle intersection method and spatial data fusion method to locate and simulate the simulation to verify the accuracy of the algorithm.Aiming at the acoustic target that can detect complete Doppler effect in the process of moving,the single-array element Doppler matching projection method is studied.Using the modulated Doppler signal,search the maximum projection in the subspace of the independent variable,to get the distance of the sound source and the speed of movement.Combining this algorithm with the sound intensity method of a single vector sensor,it will obtain the motion trajectory of the target.Finally,the reliability of above algorithms in practical application is verified by experimental data processing.The research shows that the positioning methods based on small aperture array can achieve very precise results when the signal-to-noise ratio in time domain is more than 0dB,which solves the problem that the conventional beamforming algorithm has large space and large computational complexity.A static target positioning system consisting of multiple small aperture arrays can accurately estimate the position of the point source.The single-array element positioning algorithm based on Doppler frequency can accurately estimate the moving target under the condition of satisfying the model.