Guidance and Control of a Spinning 155mm Artillery Shell

Guidance and control of artillery shells using roll coupled guidance fuze is a less explored research area due to high spin rate of artillery shells during their flight. The advancement of technology in sensors and navigation available at low cost has made it possible to guide and control spinning artillery shells. Conventional guidance fuze used to guide artillery shell is roll decoupled with its spinning body due to its high spin rate. This research considers roll coupled guidance fuze at nose of 155mm artillery shell. Detailed Mathematical model of spinning projectile is developed, then Guidance through Impact Point Prediction (IPP) by ignoring aerodynamics for guidance is used to guide projectile towards target, which is implemented with proportional controller with saturation. Guidance Fuze or Precision Guidance Kit (PGK) at nose of projectile contains movable canards, controller, sensors and actuators. Controller runs the control algorithm, which controls the projectile by deflecting canards through actuators with the phase lead to improve the performance. Forces and moments of canards have been modeled with the sizing of canards surfaces. Results are analysed using Monte Carlo Method which models sensors, variations in initial conditions and aerodynamic coefficients to model different environmental conditions. Results show that correction made in trajectory by guidance algorithm reduce Circular Error Probable (CEP) and average miss distance.