Satellite power control method based on fuzzy logic control

doi:10.3785/j.issn.1008-973X.2020.05.022

Journal of ZheJiang University (Engineering Science)

2020, Vol. 54

Issue (5): 1029-1038 DOI: 10.3785/j.issn.1008-973X.2020.05.022

Aerospace Technology

Satellite power control method based on fuzzy logic control

Peng-cheng LIU(

),Jiu-ling XU,Jia-jun HUANG,Chao-jie ZHANG*(

)

Micro-satellite Research Center, Zhejiang University, Hangzhou 310027, China

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Abstract

A power control method based on fuzzy logic control was proposed, aming at the problem that the access method of code division multiple access in the satellite communication system may cause problems such as near-far effect. The transmission power of each slave star was controlled in the inner loop power control, so that the received power of each slave star to the master star was balanced. The fuzzy logic controller improved the overall ranging accuracy by dynamically adjusting the target power to the best in the outer loop power control. The proposed power control method was compared with the traditional fixed step power control method in the simulation of Matlab. Simulation results show that both methods can make the power from each slave star to the master star equal, and track the minimum slave power. However, the power control method based on fuzzy logic control has faster response. An experiment platform for communication between a master star and three slave stars was established on the monitoring and control transponder. Experimental results showed that after power control, the overall ranging accuracy of satellite formation was increased from 60 cm to 20 cm, and the power from each slave star to the master star was balanced.

Key words： satellite formation satellite communication system power control fuzzy logic control ranging accuracy

Received: 23 April 2019 Published: 05 May 2020

CLC:

V 11

Corresponding Authors: Chao-jie ZHANG E-mail: 21824029@zju.edu.cn;zhangcj@zju.edu.cn

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Cite this article:

Peng-cheng LIU,Jiu-ling XU,Jia-jun HUANG,Chao-jie ZHANG. Satellite power control method based on fuzzy logic control. Journal of ZheJiang University (Engineering Science), 2020, 54(5): 1029-1038.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.05.022 OR http://www.zjujournals.com/eng/Y2020/V54/I5/1029

基于模糊逻辑控制的卫星功率控制方法

卫星通信系统中码分多址的接入方式会引起远近效应问题，针对此问题提出基于模糊逻辑控制的功率控制方法.在内环功率控制中控制各从星的发射功率，使各从星到达主星的接收功率平衡；在外环功率控制中，模糊逻辑控制器通过动态调节目标功率为最佳的方式，提高总体测距精度. 在Matlab仿真中将该功率控制方法与传统的固定步长功率控制方法进行对比，仿真结果表明，2种方法均能使各从星到达主星的功率趋于相等，并追踪最小的从星功率，但是基于模糊逻辑控制的功率控制方法的响应速度更快. 在测控应答机上，搭建1颗主星与3颗从星之间通信的实验平台. 实验结果表明，使用功率控制后，卫星编队的总体测距精度从60 cm提高到20 cm，各从星到达主星的功率平衡.

关键词： 卫星编队, 卫星通信系统, 功率控制, 模糊逻辑控制, 测距精度

Fig.1 Relationship between slaves A, B and master

Fig.2 Model diagram of closed loop power control

Fig.3 Model diagram of traditional fixed step power control method

Fig.4 Member function of input variables and output variables

Tab.1 Fuzzy logic control rule

Fig.5 Fuzzy control surface of input variables and output variables

Tab.2 Satellite orbit parameter table

Fig.6 Power curves of three slave stars without power control

Fig.7 Power control simulation curve of power control method based on fuzzy logic control

Fig.8 Traditional fixed step power control simulation

Fig.9 Power control deviation curves of traditional fixed step power control method and method based on fuzzy logic control

Fig.10 Power control experimental verification platform based on fuzzy logic control

Fig.11 Ranging accuracy without power control

Fig.12 Ranging accuracy graph of power control method based on fuzzy logic control

Fig.13 Received power variation map for three channels


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