Range and Accuracy Improvement of Artillery Rocket Using Fixed Canards Trajectory Correction Fuze

Abstract

This paper presents a two-phase guidance and control algorithm to extend the range and improve the impact point accuracy of a 122-mm rocket using a fixed canards trajectory correction fuze. The guidance algorithm consists of a unique glide and correction phase of the rocket trajectory that is activated after the flight’s apex. The glide phase operates in an open-loop configuration where guidance commands are generated to increase the range of the rocket. In contrast, the correction phase operates in a closed-loop configuration where the Impact Point Prediction method based on Modified Projectile Linear Theory is used as a feedback channel to correct the range and drift errors. The proposed fixed canards trajectory correction fuze has a simple and reliable single channel roll-orientation control configuration. The rocket trajectory model consists of a 7-DOF non-linear dynamic model of a dual-spin rocket configuration with a fixed canards correction fuze mounted at the nose. A Monte Carlo simulation of the rocket’s inertial and launch point perturbations show that the fixed canards fuze with the proposed guidance algorithm can double the range of the rocket without changing the rocket motor thrust-time curve. At the same time, the rocket’s accuracy can also be improved beyond the results of an unguided rocket.

Impact Point Dispersion Prediction for 300 mm R-Han 300 Artillery Rocket

“…Impact point dispersion occurs because of the uncertainty in the values of the parameters that affect its flight trajectory (Wiputgasemsuk 2021). Uncertainty of initial condition parameter values when exiting the launcher is one that may occur (Raza and Wang 2022). Fabrication and measurement inaccuracies will lead to measurement uncertainty for the mass and inertia (Le and Konecny 2021).…”

“…Monte Carlo simulation has been used in various analysis of rocket flight performance. Monte Carlo was used to predict impact point for guided artillery rocket (Ozog et al 2020), (Raza and Wang 2022), and (Wiputgasemsuk 2021). The dispersion of unguided and guided rocket at launch angles from 30 to 50 degrees was studied (Glebocki and Jacewicz 2020).…”