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Satellite sunlight pressure moment high-precision online estimation method

A solar pressure moment, high-precision technology, applied in complex mathematical operations, systems based on fuzzy logic, electrical components, etc., can solve problems such as harsh impulse response excitation conditions, and achieve strong applicability and high precision.

Active Publication Date: 2021-10-12
BEIJING INST OF CONTROL ENG
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Problems solved by technology

However, due to changes in the intensity of solar activity, the periodicity assumption is usually not valid, and the excitation conditions of the impulse response are too harsh

Method used

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  • Satellite sunlight pressure moment high-precision online estimation method
  • Satellite sunlight pressure moment high-precision online estimation method
  • Satellite sunlight pressure moment high-precision online estimation method

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Embodiment

[0110] Taking a satellite with three-axis orthogonally mounted momentum wheels as an example, the specific implementation manner of the present invention is introduced. Take the scroll axis as an example to illustrate. Assume that the satellite rolling axis inertia is 5000kg.m 2 , the moment of inertia of the reaction wheel is 0.108kg.m 2 .

[0111] (1) Establish the solar pressure moment estimation model

[0112] In the case of only considering the rolling channel, since there is only one momentum wheel speed error As input, i.e. n=1, where ω w is the real momentum wheel speed, The rotational speed of the momentum wheel is estimated, therefore, the estimated torque of the rolling channel solar light pressure can be expressed as:

[0113]

[0114] Here m is chosen as 5, that is, 5 fuzzy rules are established.

[0115] Since the online identification method is used here, the membership function does not need to be given, only the input x and the output x are given a...

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Abstract

The invention discloses a Satellite sunlight pressure moment high-precision online estimation method. The method comprises the following steps: 1) establishing a sunlight pressure moment fuzzy logic estimation model; 2) according to the sunlight pressure moment fuzzy logic estimation model in the step 1), performing online iterative adjustment by using a gradient descent method to obtain a to-be-adjusted parameter theta j; and 3) obtaining the sunlight pressure moment on line according to the on-line to-be-adjusted parameters in the step 2). According to the invention, direct on-line estimation of the sunlight pressure moment can be realized; on the premise of having no extra requirement for on-orbit data, the accuracy of on-line estimation of the sunlight pressure moment is effectively improved by utilizing prior information obtained through ground analysis.

Description

technical field [0001] The invention relates to a high-precision online estimation method for satellite sunlight pressure moment, and belongs to the technical field of space vehicle control. Background technique [0002] Sunlight pressure moment is one of the main environmental disturbance moments faced by satellites in orbit. For satellites in geostationary orbit, it is the most important environmental disturbance moment. The long-term effect of the solar light pressure moment will lead to the change of the angular momentum of the satellite, which will have an adverse effect on the attitude of the satellite. Therefore, in the design of attitude control law and angular momentum management algorithm, the modeling and analysis of disturbance torques such as solar light pressure are inseparable. Since it is difficult to obtain the solar pressure moment in orbit in real time, the current design of the angular momentum management law on the star mostly adopts a relatively simpl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G06F17/16G06N7/02
CPCG06F17/18G06F17/16G06N7/02Y02A90/10
Inventor 何刚王佐伟贾蒙杨甘永郝燕艳冯佳佳王海强候凤龙王青贾涛辛优美高秀娟
Owner BEIJING INST OF CONTROL ENG
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