Trajectory Prediction and Correction Methods Without Meteorological Information

Abstract

Drag-ring correction schedule for one dimension trajectory correction projectile, with the characteristics of simple control actuator, reliable action, low cost, and greatly improving the ground vertical intensity etc., has been applied on the shells and achieved good application effect in recent years. Two aspects are extremely important in the implement of this projectile: First, the corresponding firing elements (i.e., the elevation angle) should ensure that the flight distance of uncontrolled projectile is greater than or equal to the desired distance. Second, real time identification of the characteristic parameters of the projectile should be performed based on the measurements of a segment of flight data. However, high altitude meteorological conditions cannot be obtained in practice, which makes it extremely difficult to ensure that the average impact point center of uncontrolled projectiles is consistent with the generalized target, and brings a great impact for the accuracy of trajectory prediction and the trajectory correction effect. For those problems, in this paper the corresponding equivalent wind parameters are obtained based on a few rounds of the impact point data of the uncontrolled shells test-fired in advance, to ensure the validity of the setting firing elements and trajectory prediction. Furthermore, the number of test-fired and the different methods and their effects of getting the equivalent wind parameters are analyzed. The research content reported in this paper is able to provide useful guide for the application of the trajectory correction technique for the one dimensional trajectory correction projectile.