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http://dx.doi.org/10.5139/JKSAS.2019.47.3.187

Line-of-Sight Rate for Off-axis Seeker on a 2-axis Gimbal  

Kim, Jeong-Hun (Inha University)
Park, Kuk-Kwon (Inha University)
Ryoo, Chang-Kyung (Inha University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.47, no.3, 2019 , pp. 187-194 More about this Journal
Abstract
The off-axis Infra-Red(IR) seeker is mounted on the nose cone side of the anti-air high speed missile to alleviate thermal shield effect due to aerodynamic heating. The seeker output can not be regarded as the Line-of-Sight(LOS) rate any more as missile's roll motion to keep the target tracking is associated. In this paper, we propose a method to calculate the LOS rate for off-axis seeker on a 2-axis gimbal. Firstly, true LOS rate equations are analytically derived but not implementable because boresight error rate is not measurable. And then the first order lag approximation to obtain boresight error rate is proposed. The proposed LOS rate calculation method can compensate the coupling effect by considering the rotations of missile and gimbal. The performance of the proposed method is verified via full nonlinear 6-DOF(Degree of Freedom) simulations.
Keywords
2-axis Gimbal; Off-axis Seeker; LOS Rate;
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