Abstract
This paper focuses on the on-line compensation of the disturbance rejection rate (DRR) for a platform seeker. The mathematical model of the typical platform seeker based on the inertial space is established, and the line-of-sight (LOS) rate from different signal extraction points is strictly derived. Considering the spring torque disturbance and damping torque disturbance caused by the missile attitude motion, the seeker DRR transfer functions are deduced and the amplitude and phase characteristics at different frequencies are also analyzed. In order to close the engineering practice, the DRR parasitic loop (DRRPL) model of the seeker is rationally simplified and the stable region of the parasitic loop from different extraction points is also obtained. However, to increase the stability and guidance accuracy of the missile terminal flight, the compensation scheme based on the high-gain extended state observer (ESO) is used to estimate the disturbance torques and eliminate the seeker DRR effect. Numerical simulations are conducted to verify the effectiveness of the proposed scheme. The simulation results show that the seeker DRR effect mainly exists in the middle and low frequencies and the stable region of the parasitic loop at different signal extraction points is different. The proposed compensation scheme can effectively eliminate the parasitic loop effect of the seeker and increase the flight stability of the missile. It can reduce the terminal miss distance of the missile and improve the strike accuracy.
Highlights
Seekers are the tracking and detecting system of missiles, which are well used to acknowledge and track a target [1, 2]
The proposed disturbance rejection rate (DRR) compensation scheme is applied to the missile guidance flight process, and its impact on miss distance is analyzed
The proposed compensation scheme is executed to eliminate the effect of disturbance, and the observer gains are selected as β01 = 10, β02 = 500, β03 = 4680, α = 0 25, and ε = 0 8
Summary
Seekers are the tracking and detecting system of missiles, which are well used to acknowledge and track a target [1, 2]. The DRR represents the ability of the seeker to isolate the disturbance of the missile body It affects the output accuracy of the LOS rate and forms an extra parasitic loop in the guidance system, which affects the stability and guidance accuracy [7, 8]. Since the high-gain ESO can perform a simultaneous estimation of the state variables and the unknown disturbance [26], its interconnection in the seeker control system allows using the estimates instead of their true values to eliminate the DRR effect of the platform seeker and achieve the accurate LOS rate output.
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