Target attitude cooperative planning method and system of multistage composite control of spacecraft

Abstract

The invention provides a target attitude cooperative planning method and system of multistage composite control of a spacecraft. A designed spacecraft multistage composite control system comprises a star first-stage control system and a load second-stage control system, and a load and a star are required to track the same target attitude in a wide-angle agile maneuvering process of the spacecraft.The control periods of the star are different, the target attitude of the load within the control period deltat2 is calculated by employing an interpolation method in the condition of knowing the target attitude of a star platform. Firstly, a target attitude thetabr in a next control period deltat1 is calculated through a star attitude planning algorithm; then the load calculates a target attitude thetapr of the load within each deltat2 time by employing a Newton interpolation method in the condition of knowing the target attitude thetabr within the deltat1 time; and in the condition of knowing the target attitudes of the star and the load at each time point, the spacecraft multistage composite control system performs attitude control by employing a star and load two-stage PID controllerso that high-stability control of the optical load of the spacecraft is realized.

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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