光通信中卫星振动抑制的自适应复合控制
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摘要
在星地光通信中为了获得较高的性能,需要捕获对准跟踪(APT)系统具有高精度,而卫星振动是影响APT精度的最主要因素。传统反馈控制对卫星振动的中高频抑制效果较差。针对这种情况,将自适应算法引入前馈控制,设计了最小均方(LMS)和递推最小二乘(RLS)两种自适应反馈复合控制算法。仿真验证了反馈控制、LMS复合控制以及RLS复合控制三种算法的性能,结果表明自适应前馈复合控制算法对中高频振动抑制效果明显,采用更快收敛速度以及更高稳态精度的自适应算法可以提高抑制效果。
In order to obtain higher performance in space-to-ground optical communications, the acquisition, pointing and tracking(APT) system needs to have high precision. The vibration of satellites is the most important factor which affects the accuracy of APT. The suppression effect of traditional feedback control is bad in the mediumto-high frequency range of satellites′ vibrations. For this situation, adaptive algorithm is introduced into feedforward control and two kinds of adaptive feedback composite algorithms based on the least mean squares(LMS) and recursive least squares(RLS) algorithms are designed. Feedback control, LMS composite control and RLS composite control are verified by simulations. The results show that the effect of adaptive feedforward composite control is better for the medium-to-high frequency vibrations and the use of adaptive algorithms with faster convergence and higher steady-state precision can improve the suppression effect.
In order to obtain higher performance in space-to-ground optical communications, the acquisition, pointing and tracking(APT) system needs to have high precision. The vibration of satellites is the most important factor which affects the accuracy of APT. The suppression effect of traditional feedback control is bad in the mediumto-high frequency range of satellites′ vibrations. For this situation, adaptive algorithm is introduced into feedforward control and two kinds of adaptive feedback composite algorithms based on the least mean squares(LMS) and recursive least squares(RLS) algorithms are designed. Feedback control, LMS composite control and RLS composite control are verified by simulations. The results show that the effect of adaptive feedforward composite control is better for the medium-to-high frequency vibrations and the use of adaptive algorithms with faster convergence and higher steady-state precision can improve the suppression effect.
引文
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4 Qian Feng,Jia jianjun,Zhang Liang,et al..Positioning accuracy of spot-detecting camera in acquisition,tracking,pointing system[J].Chinese J Lasers,2013,40(2):0205007.钱峰,贾建军,张亮,等.捕获、跟踪、瞄准系统中光斑探测相机的定位精度[J].中国激光,2013,40(2):0205007.
5 LüChunlei,Tong Shoufeng,Song Yansong.Optical-path optimization design of compound axis and APT study of airborne laser communication[J].Acta Photonica Sinica,2012,41(6):649-653.吕春雷,佟首峰,宋延嵩.机载光通信复合轴光路优化设计和跟瞄技术研究[J].光子学报,2012,41(6):649-653.
6 Hu Xiuhan,Zhou Tianhua,He Yan,et al..Design and analysis of underwater optical communication transceiver system based on digital signal processor[J].Chinese J Lasers,2013,40(3):0305003.胡秀寒,周田华,贺岩,等.基于数字信号处理机的水下光通信收发系统设计及分析[J].中国激光,2013,40(3):0305003.
7 Shinhak Lee,James W Alexander,Gerry G Ortiz.Sub-microradian pointing system design for deep-space optical communications[C].SPIE,2001,4272:104-111.
8 K J Held,J D Barry.Precision opitcal pointing and tracking from spacecraft with vibrational noise[C].SPIE,1986,616:160-173.
9 Victor A Skormin,Mark A Tascillo.Jitter rejection technique in a satellite-based laser communication system[J].Opt Eng,1993,32(11):2464-2769.
10 Gerardo G Ortiz,Angel Portillo,Shinhak Lee,et al..Functional demonstration of accelerometer-assisted beacon tracking[C].SPIE,2001,4272:112-117.
11 S Lee,G Ortiz,J W Alexander,et al..Accelerometer-assisted tracking and pointing for deep-space optical communications:concept,analysis and implementations[C].IEEE Aerospace Conference,2001,3:1559-1564.
12 Morio Toyoshima,Yoshihisa Takayama,Hiroo Kunimori.In-orbit measurements of spacecraft microvibrations for satellite laser communication links[J].Opt Eng,2010,49(8):083604.
13 Fu Chenyu,Jiang Tao,Ren Ge,et al..Image tracking system with a fine-steering-mirror[J].Opto-Electronic Engineering,1994,21(3):1-6.付承毓,姜涛,任戈,等.快速反射镜成像跟踪系统[J].光电工程,1994,21(3):1-6.
14 Larry Edward.Control of a Fast Steering Mirror for Laser-Based Satellite Communication[D].Boston:Massachusetts Institute of Technology,2006.
15 R J Watkins.The Adaptive Control of Optical Beam Jitter[D].Monterey:Naval Postgraduate School,2004.30-41.
16 B E Batman.Experiments on Laser Beam Jitter Control with Applications to a Shipboard Free Electron Laser[D].Monterey:Naval Postgraduate School,2007.20-40.
17 M J Beerer.Adaptive Filter Techniques for Optical Beam Jitter Control and Target Tracking[D].Monterey:Naval Postgraduate School,2008.15-33.