An Accurate Line-of-Sight Rate Estimation Method Based on LSTM Recurrent Neural Network for Strapdown Imaging Seeker

Zhu, Di; Zheng, Yongbin; Xu, Wanying; Bai, Shi

doi:10.1109/jsen.2022.3208013

Cited by 1 publication

(1 citation statement)

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“…As an important part of aircraft guidance and control, a seeker can realize attitude disturbance rejection and stable tracking of a space target [1,2]. The types of aircraft seeker can be divided into two-axis and three-axis seekers according to the frame structure.…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of the Disturbance Rejection Rate of a Roll–Pitch Seeker on Stable Tracking Characteristics

Xiao,

Lu,

et al. 2023

Aerospace

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The disturbance rejection rate (DRR) is an inherent problem of the seeker. The additional line-of-sight (LOS) angular velocity information of the seeker caused by the DRR will affect the attitude of the aircraft through the guidance system, thus forming a parasitic loop in the guidance and control system of the aircraft, which has a great influence on the guidance accuracy. In this study, the influence of the DRR of the roll–pitch seeker on the stable tracking of a maneuvering target is explored. First, the tracking principle of the roll–pitch seeker is analyzed and the conditions for completely isolating the disturbance of the aircraft attitude are deduced. Then, the expression of the frame error angle is derived, a semi-strap-down stable control closed-loop scheme is established, and the DRR transfer function is derived by adding different disturbance torque models. Finally, the simulation of stability tracking characteristics is carried out. The results show that when the aircraft attitude is disturbed at a low frequency or the target is maneuvering at a low frequency, the DRR caused by the spring torque has a great influence on the tracking angle of the two frames, the line of-sight rate accuracy of the optical axis output and the detector error angle. On the contrary, the damping torque DRR plays a leading role in tracking accuracy.

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Section: Introductionmentioning

confidence: 99%