Applying a direct identifier-based adaptive strategy for enhancing line-of-sight control
This article presents the control of line-of-sight for two-DOF gimbal system. To improve the performance system, the direct identifier-based adaptive controller is proposed. In this strategy, the parameters of controller polynomials are calculated through recursive least square. With respect to the obtained polynomials, the control signal is implemented for both elevation and azimuth axes. This approach is applied to track a target in 3D spaces for two-DOF gimbal system and test both the axes. The simulation results confirm the efficiency of this purposed controller and satisfy the tracking a given target.
 Abdo M., Vali A.R., Toloei A. and et al., “Research on the cross-coupling of a two axes gimbal system with dynamic unbalance,” International Journal of advanced robotic systems, vol.10, no.357, pp.1-13 2013.
 Modal S., Sadhu S., Banerjee A., “Platform motion disturbances attenuation in a missile seeker subsystem using internal model control,” International Conference on Control, Automation, Robotics and Embedded Systems, pp.1-4, 2013.
 Hua-Jie H., Zhi-Qiang L., Shi-Xun F. and et al., “Multi rate tracking controller analysis and design for target tracking systems,” Journal of Central South University, vol.20, no.11, pp.3049-3056, 2013.
 Abdo M.M., Vali A.R., Toloei A.R., and et al., “Stabilization loop of a two axes gimbal system using self-tuning PID type fuzzy controller,” ISA Transaction, vol.53, no.2, pp.591-602, 2014.
 Enayati N., De Momi E., Ferrigno G. “A quaternion-based unscented kalman filter for robust optical/inertial motion tracking in computer-assisted surgery,” IEEE transaction on instrumentation and measurement, vol.64, no.8, pp.2291-2301, 2015.
 Waldmann J., “Line-of-sight rate estimation and linearizing control of an imaging seeker in a tactical missile guided by proportional navigation,” IEEE Transaction on Control Systems Technology, vol.10, no.4, pp.556-567, 2002.
 Tran N.H., Choi S.H., Bae J.H. and et al., “Design, control, and implementation of a new AUV platform with a mass shifter mechanism,” International Journal of Precision Engineering and Manufacturing, vol.16, no.7, pp.1599-1608, 2015.
 Ra W.S., Whang I.H., Ahn J.Y., “Robust horizontal line-of-sight rate estimator for see skimming anti-ship missile with two-axis gimbaled seeker,” IEE Proceeding-Radar, Sonar and Navigation, vol.152, no.1, pp.9-15, 2005.
 Kandemir K.D., Akmese A., Yazicioglu Y., “Line-of-sight stabilization of a gimbaled mechanism under passive isolation,” Journal of Aerospace Engineering, vol.1, no. 228, pp. 35-43, 2012.
 Smirnov V.A., Savelev V.V., Zakharikov V.S., “LOS stabilization and pointing system with extended field of view,” Gyroscopy and Navigation, vol.3, no.1, pp.66-71, 2011.
 Khamis A., Subbarm Naidu D. and Kamel A.M., “Nonlinear optimal tracking for missile gimbaled seeker using finite-horizon state dependent Riccati equation,” INTL Journal of Electronics and Telecommunications, vol.60, no.2, pp.165-171, 2014.
 Espinosa C., Maygen K., Lizarraga M. and et al., “Sliding mode line-of-sight stabilization of a two-axis gimbal system,” Workshop on Research Education and Development of Unmanned Aerial System, 23-25 November, Mexico, 2015.
 Skjong E., Nundal S.A., Leira F.S. and et al. “Autonomous search and tracking of objects using predictive control of unmanned aerial vehicle and gimbal: hardware in-the-loop simulation of payload and avionics,” International Conference on Unmanned Aircraft Systems, USA, pp.904-913, 2015.
 Cong Sh., Deng K., Shang W. and et al, “Isolation control for inertially stabilized platform based on nonlinear friction compensation,” Nonlinear Dynamic, vol.84, no.3, pp.1123-1133, 2015.
 Fang J., Yin R., Lei X., “An adaptive decoupling control for three-axis gyro stabilized platform based on neural networks,” Mechatronics, vol.27, pp.38-46, 2015.
 Kim K.H., Lee J.K., Park B.S. and et al. “Chatter-free sliding mode control for inertial stabilization of OTM (on-the-move) antenna driven by gear and flexible shaft,” International Journal of Precision Engineering and Manufacturing, vol. 13, no.8, pp.1317-1325, 2012.
 Zou Y., Lei X., “A compound control based on the adaption neural network and sliding mode control for inertial stable platform,” Neurocomputing, vol.155, pp.286-294, 2015.
 Zhou X., Jia Y., Zhao Q. and et al., “Experimental validation of a compound control scheme for a two-axis inertially stabilized platform in an unmanned helicopter-based airborne power line inspection system,” Sensors, vol.16, no.3, pp.2-15, 2016.
 Ataei M., Moallem P., and Mahsouri R., “A comprehensive model of a tracker system on motion equations of a two degree-of freedom gimbal system,” International Review of Aerospace Engineering, vol.7, no.4, pp.101-108, 2014.