Analysis And Optimization Design Of Positioning Error Of Automatic Target Reporting Device Based On TDOA

Although the double triangle array automatic acoustic target reporting device based on TDOA is widely used to measure the vertical target intensity of large target,there still exist some problems such as low positioning accuracy and poor positioning stability in practical application.In order to improve the positioning accuracy and stability of the double triangle array automatic acoustic target device,this paper grasps the main error component affecting the positioning accuracy,which is based on the studies on the positioning error mechanism of the device.This paper attempts to optimize the design of the device by establishing a dual triangular array location model based on shock wave propagation path.Through the analysis of the working process and method of error control of the existing double triangle array automatic acoustic target device,the possible source of the device positioning error is determined.Several important error sources,such as oblique incidence of projectile,wind speed and direction,nutation angle of projectile,installation error of microphone,attenuation of apparent velocity of shock wave,acquisition and processing process of shock wave signal and positioning model,are established error model respectively.The location error distribution when different error sources act independently are calculated by MATLAB simulation,and the main error factors affecting acoustic positioning accuracy are obtained.In order to solve the problem of multiple error combination in the positioning process of the double triangle array automatic acoustic target reporting device,the coupling analysis of multiple error sources of the double triangle array automatic acoustic target reporting device is emphasically carried out.The combined processes of projectile oblique incidence,wind speed and direction,shock signal acquisition and processing are analyzed respectively.The multi-error coupling error model is established and simulated.Accordingto the results,the measurement accuracy will be further reduced by the simultaneous action of multiple error factors,among which the oblique incidence of projectiles,wind speed and direction are the two main error sources.According to the fact that the oblique incidence of projectiles,wind speed and direction are two main error sources,correction models of oblique incidence and coupling among oblique incidence,wind speed and wind direction based on double triangle array automatic acoustic target reporting device is built respectively,according to the shock wave propagation path acting on acoustic array sensors during the flight of the projectile,which is distinguished from the conventional modeling method based on the apparent velocity.Simulation results show that the two correction models both can be used to improve the accuracy of acoustic localization.In order to verify the correction effect of correction models of oblique incidence and coupling among oblique incidence,wind speed and wind direction,shooting experiments was carried out respectively.The comparison between two modified models and the conventional double-triangle array positioning model's deviation between the positioning coordinates and actual coordinates is performed to verify.Indoor target track and field experiments show that both the correction model of oblique incidence and the correction model of coupling can effectively improve the localization accuracy.Two correction models can be used to achieve the optimal design of the automatic acoustic target device.