Robust control of a yaw-pitch gimballed seeker

Abstract

If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -This paper aims to present a robust design approach to realize disturbance attenuation for a yaw -pitch gimballed system subject to actuator saturation and disturbances. Design/methodology/approach -To minimize the impacts of disturbances in the presence of saturation nonlinearity and acquire desired response performance, the control approach is of double closed-loop configuration. State feedback controllers are synthesized via convex optimization and used to stabilize the inner loops; robust controllers are synthesized via mixed H ϱ optimization and used to stabilize the outer loops. Findings -It is shown through performance simulations that the proposed control scheme is effective in terms of command following, stability and disturbance attenuation. Practical implications -The presented robust control approach provides a theoretical method to facilitate designing a stable servo control loop for a yaw -pitch gimballed seeker. Originality/value -This paper supplies an effective way of addressing stabilization problem induced from actuator saturation and system uncertainties.

Design of Generalized Predictive Control for the Stabilizing Loop from a two-axis Gimbal Seeker, Considering Cross-Coupling in Between two Channels

“…Also, during the online simulation of this system, the Fuzzy PID controller was not able to control the entire flight path due to the complexity of applying the online conditions, and after a limited distance, the system was diverted and is not directed to the target [7]. A dynamical model of the gimballed system regarding the cross coupling unit, the angular motion platform and the input of torque disturbances for both the azimuth and elevation channel was submitted and the designer by using feedback Linearization has stabilized stability and attenuate the chaos [8]. In this paper, the dynamics of flight and simulation was not studied during various flight and engagement scenarios.…”

Stability of cooperative unmanned aerial vehicles based on relative measurements

“…In all types of homing guidance, an onboard sensor, namely a seeker, is utilized to provide target data so as to ensure target acquisition and tracking by the missile. Indeed, the seeker is the eye of a homing missile and provides LOS (line-of-sight) angular rate and the measurements of target motion including relative range and closing velocity (see literature [9][10][11] for more details).…”

Force transmission of flexure-based leverage mechanism for static unbalance measuring system under self-gravity effect

“…Similarly, Yang et al 15 and Zhan et al 16 proposed different prototypes for the static unbalance measurement system. Based on Zhan and colleagues early work, 16,17 the flexure-based mechanism is proposed and acts as a bridge between the double-frame mechanism and a force sensor. Therefore, the linearity characteristics of the force transmission have significant effects on the measurement precision of this system.…”

“…Our developed static unbalance measurement system has a unique resolution of 0.0013 g cm and maximum hysteresis error of 0.12 g cm, which is superior to our early work and other conventional systems. 14,16,17,22,23 The remainder of this article is organised as follows. Section 'The static unbalance measurement system' introduces the measuring principle and the structure of the static unbalance system.…”

“…Their commercial products have a resolution of 0.1 g cm for a light seeker. Similarly, Yang et al 15 and Zhan et al 16 proposed different prototypes for the static unbalance measurement system. Based on Zhan and colleagues early work, 16,17 the flexure-based mechanism is proposed and acts as a bridge between the double-frame mechanism and a force sensor.…”