| Title |
Applicability Study of Roll Angle Estimation Method through Coordinate System Transformation |
| Authors |
신승제(Seung-Je Shin) ; 김철영(Chul-Young Kim) |
| DOI |
https://doi.org/10.5573/ieie.2020.57.10.79 |
| Keywords |
Ammunition; Guidance; Navigation; Control; Roll angle |
| Abstract |
The intelligent ammunition capable of navigation/guided control has built-in high-impact electronics to overcome strong impact and high-speed rotation at the beginning of launch. However, since strong shock and high-speed rotation are applied in a short moment, initial alignment for navigation is impossible, and power is applied and initialized by a thermoelectric battery operated by the amount of shock immediately after launch. The roll angle estimation is the most necessary for initializing navigation during a flight using a Global Positioning System(GPS) and Inertial Navigation System(INS). It is very difficult to estimate the roll angle due to the rotational force of 20 to 30 times per second caused by the steel wire of the gun barrel, and it causes many errors. In the case of M982(Excalibur), an intelligent ammunition developed in united states, the roll angle is estimated by using the change in GPS reception intensity and rotation rate. This method has problems such as poor estimation accuracy if the rotation rate is not kept constant for a certain period of time. To solve this problem, a new roll angle eestimation technique was proposed that is independent of the rotation rate[14]. In this paper, it was confirmed that the error of the recently proposed roll angle estimation technique does not affect the integrated navigation and guided control of intelligent ammunition, and further confirmed the applicability through the final target hitting accuracy analysis. For this, performance analysis was constructed and it was confirmed that there was no performance degradation in various guidance techniques. |