Study on large scale projectile impact point positioning method based on trajectory shock wave

摘要

With multiple nodes of single acoustic sensor layed around the target, the ballistic shock wave signal of the projectile generated before hitting the ground can be detected at different locations. The trajectory can be estimated by measuring the time difference between the signal of different nodes, and the impact point can be coordinated by crossing the trajectory with the target. In this article, the projectile impact point positioning model is parameterised and fomulated by nonlinear equations with six patameters, and it can be solved by means of nonlinear least square (NLS) method. By means of Cramer-Rao lower bound (CRLB) analysis, measurement error distribution by different incident angle and different impact location is calculated, and also, parameter of exterior ballistics model and wind vector is under consideration.