Research on the Principle of Trajectory Correction Look-up Table of Range Correction Fuze

摘要

Range correction fuze (RCF) comes to being because of interaction between range and precision of the general projectile. The environment sensitive device and damping correction mechanism are mounted inside the fuze for the purpose of controlling the real trajectory of projectile and reducing the range error. Range correction fuze (RCF) are made up of the subsystem of conventional fuze system and the subsystem of range correction, it not only has the function of traditional fuze that warrants ammunition safety and controls ignition, but also has the function of increasing shooting precision through increasing flight resistance of projectile and reducing range. The key component is trajectory sensitive device, which it acquire the trajectory minimum velocity and appear time, and convert into the opening time of brake drag mechanism. This paper presents the principle of trajectory correction look-up table, according to the trajectory identification method based on the minimum velocity of trajectory and appear time. Before launching bomb, the setter computes and forms the brake drag mechanism open-time table according to war field information and shooting elements. After launching bomb, the environment sensitive device in the fuze begins to measure the velocity in the real trajectory. Once the velocity of pill becomes the minimum value, the velocity value and appearing time are sent to the fuze controller. The fuze controller searches in the brake drag mechanism open-time table according to the minimum velocity value and appearing time, and the actual open time of the brake drag mechanism is calculated by linear interpolation. And then, the controller controls the exact opening time of the brake drag mechanism in real-time according to opening time, reach the purpose of range correction. The paper introduced the principle of trajectory correction look-up table and the base of scheme put ,and gave the math model & working flow of the principle of trajectory correction look-up table.