A method and system for collaborative planning of target attitude for multi-level composite control of spacecraft

Abstract

A target attitude collaborative planning method and system for multi-level composite control of a spacecraft. The designed multi-level composite control system for a spacecraft includes a first-level control system for a star and a second-level control system for a load. The payload and the star are required to track the same target attitude during the large-angle agile maneuvering of the spacecraft. Due to the different control periods of stars, it is necessary to use the interpolation method to calculate the load control period Δt under the condition that the target attitude of the star platform is known. 2 target pose in time. First, the next control cycle Δt is calculated by the star attitude planning algorithm 1 The target pose θ within br . Then, load at a known Δt 1 The target pose θ in time br , using the Newton interpolation method to calculate each Δt 2 The target attitude θ of the load in time pr . In the case that the target attitude of the star and the payload at each time point is known, the spacecraft multi-level composite control system uses the star and payload two-stage PID controllers for attitude control to achieve high stability control of the spacecraft optical load.

Description

technical field [0001] The invention belongs to the field of spacecraft attitude control, and relates to a target attitude collaborative planning method and system for realizing multi-level composite control of spacecraft. Background technique [0002] Spacecraft missions such as space-based astronomical observation and extremely high-resolution earth observation have put forward the "three super" control requirements such as ultra-high-precision pointing, ultra-high stability control, and ultra-agile control of optical loads. Traditional spacecraft are limited by factors such as sensor measurement bandwidth and actuator response bandwidth, and it is difficult to meet the "three super" control requirements of optical loads. To solve this problem, a spacecraft multi-level compound control system based on active pointing ultra-quiet platform came into being. In the multi-level composite control system of the spacecraft, the star and the load are connected through a flexible a...

AI Technical Summary

Problems solved by technology

[0006] 2. It is difficult to achieve the smoothness of the load target attitude and target angular velocity

Since the star controls the period Δt 1 There is a random error dt in the timing accuracy of , which affects the smoothness of the load target attitude and target angular velocity planning

Using the linear interpolation method, due to the existence of the random error dt, the non-smooth characteristics of the load target attitude and target angular velocity obtained by linear interpolation are obvious, causing periodic error fluctuations in the load attitude control, which is not conducive to the ultra-high stability control of the load

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